Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

56 files changed, 19117 insertions, 0 deletions

diff --git a/src/bin/perfdhcp/Makefile.am b/src/bin/perfdhcp/Makefile.am
new file mode 100644
index 0000000..63fa835
--- /dev/null
+++ b/src/bin/perfdhcp/Makefile.am
@@ -0,0 +1,57 @@
+SUBDIRS = . tests
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += -I$(top_srcdir)/src/bin -I$(top_builddir)/src/bin
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+AM_LDFLAGS = -lm
+if USE_STATIC_LINK
+AM_LDFLAGS += -static
+endif
+
+# convenience archive
+
+noinst_LTLIBRARIES = libperfdhcp.la
+
+libperfdhcp_la_SOURCES  =
+libperfdhcp_la_SOURCES += command_options.cc command_options.h
+libperfdhcp_la_SOURCES += localized_option.h
+libperfdhcp_la_SOURCES += perf_pkt6.cc perf_pkt6.h
+libperfdhcp_la_SOURCES += perf_pkt4.cc perf_pkt4.h
+libperfdhcp_la_SOURCES += packet_storage.h
+libperfdhcp_la_SOURCES += pkt_transform.cc pkt_transform.h
+libperfdhcp_la_SOURCES += rate_control.cc rate_control.h
+libperfdhcp_la_SOURCES += stats_mgr.cc stats_mgr.h
+libperfdhcp_la_SOURCES += test_control.cc test_control.h
+libperfdhcp_la_SOURCES += random_number_generator.h
+libperfdhcp_la_SOURCES += receiver.cc receiver.h
+libperfdhcp_la_SOURCES += perf_socket.cc perf_socket.h
+libperfdhcp_la_SOURCES += abstract_scen.h
+libperfdhcp_la_SOURCES += avalanche_scen.cc avalanche_scen.h
+libperfdhcp_la_SOURCES += basic_scen.cc basic_scen.h
+
+sbin_PROGRAMS = perfdhcp
+perfdhcp_SOURCES = main.cc
+
+perfdhcp_LDFLAGS = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS)
+
+perfdhcp_LDADD  = libperfdhcp.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/process/libkea-process.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+perfdhcp_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+perfdhcp_LDADD += $(CRYPTO_LIBS)
+perfdhcp_LDADD += $(BOOST_LIBS)
+perfdhcp_LDADD += $(PTHREAD_LDFLAGS)
+
+# ... and the documentation
+EXTRA_DIST = perfdhcp_internals.dox
+
diff --git a/src/bin/perfdhcp/Makefile.in b/src/bin/perfdhcp/Makefile.in
new file mode 100644
index 0000000..b2ea269
--- /dev/null
+++ b/src/bin/perfdhcp/Makefile.in
@@ -0,0 +1,990 @@
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+PREMIUM_DIR = @PREMIUM_DIR@
+PYTHON = @PYTHON@
+PYTHON_EXEC_PREFIX = @PYTHON_EXEC_PREFIX@
+PYTHON_PLATFORM = @PYTHON_PLATFORM@
+PYTHON_PREFIX = @PYTHON_PREFIX@
+PYTHON_VERSION = @PYTHON_VERSION@
+RANLIB = @RANLIB@
+SED = @SED@
+SEP = @SEP@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SPHINXBUILD = @SPHINXBUILD@
+SRPD_PLUGINS_PATH = @SRPD_PLUGINS_PATH@
+SR_PLUGINS_PATH = @SR_PLUGINS_PATH@
+SR_REPO_PATH = @SR_REPO_PATH@
+STRIP = @STRIP@
+SYSREPOCPP_CPPFLAGS = @SYSREPOCPP_CPPFLAGS@
+SYSREPOCPP_INCLUDEDIR = @SYSREPOCPP_INCLUDEDIR@
+SYSREPOCPP_LIBS = @SYSREPOCPP_LIBS@
+SYSREPOCPP_PREFIX = @SYSREPOCPP_PREFIX@
+SYSREPOCPP_VERSION = @SYSREPOCPP_VERSION@
+SYSREPO_CPPFLAGS = @SYSREPO_CPPFLAGS@
+SYSREPO_INCLUDEDIR = @SYSREPO_INCLUDEDIR@
+SYSREPO_LIBS = @SYSREPO_LIBS@
+SYSREPO_PREFIX = @SYSREPO_PREFIX@
+SYSREPO_VERSION = @SYSREPO_VERSION@
+USE_LCOV = @USE_LCOV@
+VALGRIND = @VALGRIND@
+VERSION = @VERSION@
+WARNING_GCC_44_STRICT_ALIASING_CFLAG = @WARNING_GCC_44_STRICT_ALIASING_CFLAG@
+YACC = @YACC@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_CXX = @ac_ct_CXX@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+pkgpyexecdir = @pkgpyexecdir@
+pkgpythondir = @pkgpythondir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+pyexecdir = @pyexecdir@
+pythondir = @pythondir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+SUBDIRS = . tests
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib \
+	-I$(top_srcdir)/src/bin -I$(top_builddir)/src/bin \
+	$(BOOST_INCLUDES)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+AM_LDFLAGS = -lm $(am__append_1)
+
+# convenience archive
+noinst_LTLIBRARIES = libperfdhcp.la
+libperfdhcp_la_SOURCES = command_options.cc command_options.h \
+	localized_option.h perf_pkt6.cc perf_pkt6.h perf_pkt4.cc \
+	perf_pkt4.h packet_storage.h pkt_transform.cc pkt_transform.h \
+	rate_control.cc rate_control.h stats_mgr.cc stats_mgr.h \
+	test_control.cc test_control.h random_number_generator.h \
+	receiver.cc receiver.h perf_socket.cc perf_socket.h \
+	abstract_scen.h avalanche_scen.cc avalanche_scen.h \
+	basic_scen.cc basic_scen.h
+perfdhcp_SOURCES = main.cc
+perfdhcp_LDFLAGS = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS)
+perfdhcp_LDADD = libperfdhcp.la \
+	$(top_builddir)/src/lib/process/libkea-process.la \
+	$(top_builddir)/src/lib/dhcp/libkea-dhcp++.la \
+	$(top_builddir)/src/lib/hooks/libkea-hooks.la \
+	$(top_builddir)/src/lib/cc/libkea-cc.la \
+	$(top_builddir)/src/lib/asiolink/libkea-asiolink.la \
+	$(top_builddir)/src/lib/dns/libkea-dns++.la \
+	$(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la \
+	$(top_builddir)/src/lib/log/libkea-log.la \
+	$(top_builddir)/src/lib/util/libkea-util.la \
+	$(top_builddir)/src/lib/exceptions/libkea-exceptions.la \
+	$(CRYPTO_LIBS) $(BOOST_LIBS) $(PTHREAD_LDFLAGS)
+
+# ... and the documentation
+EXTRA_DIST = perfdhcp_internals.dox
+all: all-recursive
+
+.SUFFIXES:
+.SUFFIXES: .cc .lo .o .obj
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/bin/perfdhcp/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/bin/perfdhcp/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+install-sbinPROGRAMS: $(sbin_PROGRAMS)
+	@$(NORMAL_INSTALL)
+	@list='$(sbin_PROGRAMS)'; test -n "$(sbindir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(sbindir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(sbindir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n;h' \
+	    -e 's|.*|.|' \
+	    -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	    test -z "$$files" || { \
+	    echo " $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files '$(DESTDIR)$(sbindir)$$dir'"; \
+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(sbindir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-sbinPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(sbin_PROGRAMS)'; test -n "$(sbindir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(sbindir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(sbindir)" && rm -f $$files
+
+clean-sbinPROGRAMS:
+	@list='$(sbin_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+clean-noinstLTLIBRARIES:
+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libperfdhcp.la: $(libperfdhcp_la_OBJECTS) $(libperfdhcp_la_DEPENDENCIES) $(EXTRA_libperfdhcp_la_DEPENDENCIES) 
+	$(AM_V_CXXLD)$(CXXLINK)  $(libperfdhcp_la_OBJECTS) $(libperfdhcp_la_LIBADD) $(LIBS)
+
+perfdhcp$(EXEEXT): $(perfdhcp_OBJECTS) $(perfdhcp_DEPENDENCIES) $(EXTRA_perfdhcp_DEPENDENCIES) 
+	@rm -f perfdhcp$(EXEEXT)
+	$(AM_V_CXXLD)$(perfdhcp_LINK) $(perfdhcp_OBJECTS) $(perfdhcp_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/avalanche_scen.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/basic_scen.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/command_options.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/main.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/perf_pkt4.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/perf_pkt6.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/perf_socket.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pkt_transform.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/rate_control.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/receiver.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/stats_mgr.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_control.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.cc.o:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ $<
+
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+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
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+.cc.lo:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LTCXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(LTCXXCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+# This directory's subdirectories are mostly independent; you can cd
+# into them and run 'make' without going through this Makefile.
+# To change the values of 'make' variables: instead of editing Makefiles,
+# (1) if the variable is set in 'config.status', edit 'config.status'
+#     (which will cause the Makefiles to be regenerated when you run 'make');
+# (2) otherwise, pass the desired values on the 'make' command line.
+$(am__recursive_targets):
+	@fail=; \
+	if $(am__make_keepgoing); then \
+	  failcom='fail=yes'; \
+	else \
+	  failcom='exit 1'; \
+	fi; \
+	dot_seen=no; \
+	target=`echo $@ | sed s/-recursive//`; \
+	case "$@" in \
+	  distclean-* | maintainer-clean-*) list='$(DIST_SUBDIRS)' ;; \
+	  *) list='$(SUBDIRS)' ;; \
+	esac; \
+	for subdir in $$list; do \
+	  echo "Making $$target in $$subdir"; \
+	  if test "$$subdir" = "."; then \
+	    dot_seen=yes; \
+	    local_target="$$target-am"; \
+	  else \
+	    local_target="$$target"; \
+	  fi; \
+	  ($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
+	  || eval $$failcom; \
+	done; \
+	if test "$$dot_seen" = "no"; then \
+	  $(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
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+ID: $(am__tagged_files)
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+	here=`pwd`; \
+	if ($(ETAGS) --etags-include --version) >/dev/null 2>&1; then \
+	  include_option=--etags-include; \
+	  empty_fix=.; \
+	else \
+	  include_option=--include; \
+	  empty_fix=; \
+	fi; \
+	list='$(SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    test ! -f $$subdir/TAGS || \
+	      set "$$@" "$$include_option=$$here/$$subdir/TAGS"; \
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+	$(am__define_uniq_tagged_files); \
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+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
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+	  fi; \
+	fi
+ctags: ctags-recursive
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+distclean-tags:
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+			   sort -u` ;; \
+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	clean-sbinPROGRAMS mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/avalanche_scen.Plo
+	-rm -f ./$(DEPDIR)/basic_scen.Plo
+	-rm -f ./$(DEPDIR)/command_options.Plo
+	-rm -f ./$(DEPDIR)/main.Po
+	-rm -f ./$(DEPDIR)/perf_pkt4.Plo
+	-rm -f ./$(DEPDIR)/perf_pkt6.Plo
+	-rm -f ./$(DEPDIR)/perf_socket.Plo
+	-rm -f ./$(DEPDIR)/pkt_transform.Plo
+	-rm -f ./$(DEPDIR)/rate_control.Plo
+	-rm -f ./$(DEPDIR)/receiver.Plo
+	-rm -f ./$(DEPDIR)/stats_mgr.Plo
+	-rm -f ./$(DEPDIR)/test_control.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am: install-sbinPROGRAMS
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/avalanche_scen.Plo
+	-rm -f ./$(DEPDIR)/basic_scen.Plo
+	-rm -f ./$(DEPDIR)/command_options.Plo
+	-rm -f ./$(DEPDIR)/main.Po
+	-rm -f ./$(DEPDIR)/perf_pkt4.Plo
+	-rm -f ./$(DEPDIR)/perf_pkt6.Plo
+	-rm -f ./$(DEPDIR)/perf_socket.Plo
+	-rm -f ./$(DEPDIR)/pkt_transform.Plo
+	-rm -f ./$(DEPDIR)/rate_control.Plo
+	-rm -f ./$(DEPDIR)/receiver.Plo
+	-rm -f ./$(DEPDIR)/stats_mgr.Plo
+	-rm -f ./$(DEPDIR)/test_control.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-sbinPROGRAMS
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic clean-libtool \
+	clean-noinstLTLIBRARIES clean-sbinPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-sbinPROGRAMS install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-sbinPROGRAMS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/bin/perfdhcp/abstract_scen.h b/src/bin/perfdhcp/abstract_scen.h
new file mode 100644
index 0000000..99f6404
--- /dev/null
+++ b/src/bin/perfdhcp/abstract_scen.h
@@ -0,0 +1,64 @@
+// Copyright (C) 2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ABSTRACT_SCEN_H
+#define ABSTRACT_SCEN_H
+
+
+#include <perfdhcp/test_control.h>
+
+
+namespace isc {
+namespace perfdhcp {
+
+
+/// \brief Abstract Scenario class.
+///
+/// This class must be inherited by scenario classes.
+class AbstractScen : public boost::noncopyable {
+public:
+    /// \brief Default and the only constructor of AbstractScen.
+    ///
+    /// \param options reference to command options,
+    /// \param socket reference to a socket.
+    AbstractScen(CommandOptions& options, BasePerfSocket &socket) :
+        options_(options),
+        tc_(options, socket)
+    {
+        if (options_.getIpVersion() == 4) {
+            stage1_xchg_ = ExchangeType::DO;
+            stage2_xchg_ = ExchangeType::RA;
+        } else {
+            stage1_xchg_ = ExchangeType::SA;
+            stage2_xchg_ = ExchangeType::RR;
+        }
+    };
+
+    /// \brief Run performance test.
+    ///
+    /// Method runs whole performance test.
+    ///
+    /// \return execution status.
+    virtual int run() = 0;
+
+    /// \brief Trivial virtual destructor.
+    virtual ~AbstractScen() {};
+
+protected:
+    CommandOptions& options_; ///< Reference to commandline options.
+    TestControl tc_;  ///< Object for controlling sending and receiving packets.
+
+    // Helper fields to avoid checking IP version each time an exchange type
+    // is needed.
+    ExchangeType stage1_xchg_;
+    ExchangeType stage2_xchg_;
+};
+
+
+}
+}
+
+#endif // ABSTRACT_SCEN_H
diff --git a/src/bin/perfdhcp/avalanche_scen.cc b/src/bin/perfdhcp/avalanche_scen.cc
new file mode 100644
index 0000000..a4b1878
--- /dev/null
+++ b/src/bin/perfdhcp/avalanche_scen.cc
@@ -0,0 +1,202 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/avalanche_scen.h>
+
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+
+
+namespace isc {
+namespace perfdhcp {
+
+int
+AvalancheScen::resendPackets(ExchangeType xchg_type) {
+    const StatsMgr& stats_mgr(tc_.getStatsMgr());
+
+    // get list of sent packets that potentially need to be resent
+    auto sent_packets_its = stats_mgr.getSentPackets(xchg_type);
+    auto begin_it = std::get<0>(sent_packets_its);
+    auto end_it = std::get<1>(sent_packets_its);
+
+    auto& retrans = retransmissions_[xchg_type];
+    auto& start_times = start_times_[xchg_type];
+
+    int still_left_cnt = 0;
+    int current_cycle_resent_cnt = 0;
+    for (auto it = begin_it; it != end_it; ++it) {
+        still_left_cnt++;
+
+        dhcp::PktPtr pkt = *it;
+        auto trans_id = pkt->getTransid();
+
+        // get some things from previous retransmissions
+        auto start_time = pkt->getTimestamp();
+        int current_pkt_resent_cnt = 0;
+        auto r_it = retrans.find(trans_id);
+        if (r_it != retrans.end()) {
+            start_time = (*start_times.find(trans_id)).second;
+            current_pkt_resent_cnt = (*r_it).second;
+        } else {
+            start_times[trans_id] = start_time;
+        }
+
+        // estimate back off time for resending this packet
+        int delay = (1 << current_pkt_resent_cnt); // in seconds
+        if (delay > 64) {
+            delay = 64;
+        }
+        delay *= 1000;  // to miliseconds
+        delay += random() % 2000 - 1000;  // adjust by random from -1000..1000 range
+
+        // if back-off time passed then resend
+        auto now = microsec_clock::universal_time();
+        if (now - start_time > milliseconds(delay)) {
+            current_cycle_resent_cnt++;
+            total_resent_++;
+
+            // do resend packet
+            if (options_.getIpVersion() == 4) {
+                Pkt4Ptr pkt4 = boost::dynamic_pointer_cast<Pkt4>(pkt);
+                socket_.send(pkt4);
+            } else {
+                Pkt6Ptr pkt6 = boost::dynamic_pointer_cast<Pkt6>(pkt);
+                socket_.send(pkt6);
+            }
+
+            // restore sending time of original packet
+            pkt->setTimestamp(start_time);
+
+            current_pkt_resent_cnt++;
+            retrans[trans_id] = current_pkt_resent_cnt;
+        }
+    }
+    if (current_cycle_resent_cnt > 0) {
+        auto now = microsec_clock::universal_time();
+        std::cout << now << " " << xchg_type << ": still waiting for "
+                  << still_left_cnt << " answers, resent " << current_cycle_resent_cnt
+                  << ", retrying " << retrans.size() << std::endl;
+    }
+    return still_left_cnt;
+}
+
+
+
+int
+AvalancheScen::run() {
+    // First indicated number of DISCOVER packets eg. 4000 are sent.
+    // Then in a loop responses to received packets (this is
+    // consumeReceivedPackets()) are sent and then for every 200ms it is checked
+    // if responses to sent packets were received. If not packets are resent.
+    // This happens in resendPackets() method. For each packet it is checked
+    // how many times it was already resent and then back off time is calculated:
+    // 1, 2, 4, 8, 16, 64 (max) seconds. If estimated time has elapsed
+    // from previous sending then the packet is resent. Some stats are collected
+    // and printed during runtime. The whole procedure is stopped when
+    // all packets got responses.
+
+    uint32_t clients_num = options_.getClientsNum() == 0 ?
+        1 : options_.getClientsNum();
+
+    StatsMgr& stats_mgr(tc_.getStatsMgr());
+
+    tc_.start();
+
+    auto start = microsec_clock::universal_time();
+
+    // Initiate new DHCP packet exchanges.
+    tc_.sendPackets(clients_num);
+
+    auto now = microsec_clock::universal_time();
+    auto prev_cycle_time = now;
+    for (;;) {
+        // Pull some packets from receiver thread, process them, update some stats
+        // and respond to the server if needed.
+        tc_.consumeReceivedPackets();
+
+        usleep(100);
+
+        now = microsec_clock::universal_time();
+        // Wait for 200ms between subsequent check for resending.
+        // This time taken based on experiments. For times 10-30ms whole scenario
+        // time significantly grows. The same for times >200ms. The optimal times
+        // are between 50-200ms. \todo more research is needed.
+        if (now - prev_cycle_time > milliseconds(200)) { // check if 0.2s elapsed
+            prev_cycle_time = now;
+            int still_left_cnt = 0;
+            still_left_cnt += resendPackets(stage1_xchg_);
+            if (options_.getExchangeMode() == CommandOptions::DORA_SARR) {
+                still_left_cnt += resendPackets(stage2_xchg_);
+            }
+
+            if (still_left_cnt == 0) {
+                break;
+            }
+        }
+
+        if (tc_.interrupted()) {
+            break;
+        }
+    }
+
+    auto stop = microsec_clock::universal_time();
+    boost::posix_time::time_period duration(start, stop);
+
+    tc_.stop();
+
+    tc_.printStats();
+
+    // Print packet timestamps
+    if (options_.testDiags('t')) {
+        stats_mgr.printTimestamps();
+    }
+
+    // Print server id.
+    if (options_.testDiags('s') && tc_.serverIdReceived()) {
+        std::cout << "Server id: " << tc_.getServerId() << std::endl;
+    }
+
+    // Diagnostics flag 'e' means show exit reason.
+    if (options_.testDiags('e')) {
+        std::cout << "Interrupted" << std::endl;
+    }
+
+    // Print any received leases.
+    if (options_.testDiags('l')) {
+        stats_mgr.printLeases();
+    }
+
+    // Calculate total stats.
+    int total_sent_pkts = total_resent_; // This holds sent + resent packets counts.
+    int total_rcvd_pkts = 0;  // This holds received packets count.
+    // Get sent and received counts for DO/SA (stage1) exchange from StatsMgr.
+    total_sent_pkts += tc_.getStatsMgr().getSentPacketsNum(stage1_xchg_);
+    total_rcvd_pkts += tc_.getStatsMgr().getRcvdPacketsNum(stage1_xchg_);
+    // Get sent and received counts for RA/RR (stage2) exchange from StatsMgr
+    // if RA/RR was not disabled.
+    if (options_.getExchangeMode() == CommandOptions::DORA_SARR) {
+        total_sent_pkts += tc_.getStatsMgr().getSentPacketsNum(stage2_xchg_);
+        total_rcvd_pkts += tc_.getStatsMgr().getRcvdPacketsNum(stage2_xchg_);
+    }
+
+    std::cout << "It took " << duration.length() << " to provision " << clients_num
+              << " clients. " << std::endl
+              << "Requests sent + resent: " << total_sent_pkts << std::endl
+              << "Requests resent: " << total_resent_ << std::endl
+              << "Responses received: " << total_rcvd_pkts << std::endl;
+
+    return (0);
+}
+
+}  // namespace perfdhcp
+}  // namespace isc
diff --git a/src/bin/perfdhcp/avalanche_scen.h b/src/bin/perfdhcp/avalanche_scen.h
new file mode 100644
index 0000000..b745efe
--- /dev/null
+++ b/src/bin/perfdhcp/avalanche_scen.h
@@ -0,0 +1,81 @@
+// Copyright (C) 2012-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef AVALANCHE_SCEN_H
+#define AVALANCHE_SCEN_H
+
+#include <config.h>
+
+#include <perfdhcp/abstract_scen.h>
+
+
+namespace isc {
+namespace perfdhcp {
+
+// This class fixes an issue in older compilers
+// that cannot handle enum class as key in std::unordered_map.
+// See: https://stackoverflow.com/questions/18837857/cant-use-enum-class-as-unordered-map-key
+struct EnumClassHash
+{
+    template <typename T>
+    std::size_t operator()(T t) const
+    {
+        return static_cast<std::size_t>(t);
+    }
+};
+
+/// \brief Avalanche Scenario class.
+///
+/// This class is used to run the performance test where DHCP server
+/// is first loaded with indicated buffer of Discover or Solicit messages
+/// and then the class is waiting till receiving all required responses.
+/// Full DORA and SARR message sequences are expected.
+class AvalancheScen : public AbstractScen {
+public:
+    /// \brief Default and the only constructor of AvalancheScen.
+    ///
+    /// \param options reference to command options,
+    /// \param socket reference to a socket.
+    AvalancheScen(CommandOptions& options, BasePerfSocket &socket):
+        AbstractScen(options, socket),
+        socket_(socket),
+        total_resent_(0) {};
+
+    /// brief\ Run performance test.
+    ///
+    /// Method runs whole performance test.
+    ///
+    /// \return execution status.
+    int run() override;
+
+protected:
+
+    // A reference to socket;
+    BasePerfSocket &socket_;
+
+    /// A map xchg type -> (a map of trans id -> retransmissions count.
+    std::unordered_map<ExchangeType, std::unordered_map<uint32_t, int>, EnumClassHash> retransmissions_;
+    /// A map xchg type -> (a map of trans id -> time of sending first packet.
+    std::unordered_map<ExchangeType, std::unordered_map<uint32_t, boost::posix_time::ptime>, EnumClassHash> start_times_;
+
+    /// Total number of resent packets.
+    int total_resent_;
+
+    /// \\brief Resend packets.
+    ///
+    /// It resends packets for given exchange type that did not receive
+    /// a response yet.
+    ///
+    /// \param xchg_type exchange type that should be looked for.
+    /// \return number of packets still waiting for resending.
+    int resendPackets(ExchangeType xchg_type);
+
+};
+
+}
+}
+
+#endif // AVALANCHE_SCEN_H
diff --git a/src/bin/perfdhcp/basic_scen.cc b/src/bin/perfdhcp/basic_scen.cc
new file mode 100644
index 0000000..a9b696f
--- /dev/null
+++ b/src/bin/perfdhcp/basic_scen.cc
@@ -0,0 +1,256 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/basic_scen.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+
+
+namespace isc {
+namespace perfdhcp {
+
+
+bool
+BasicScen::checkExitConditions() {
+    if (tc_.interrupted()) {
+        return (true);
+    }
+
+    const StatsMgr& stats_mgr(tc_.getStatsMgr());
+
+    // Check if test period passed.
+    if (options_.getPeriod() != 0) {
+        time_period period(stats_mgr.getTestPeriod());
+        if (period.length().total_seconds() >= options_.getPeriod()) {
+            if (options_.testDiags('e')) {
+                std::cout << "reached test-period." << std::endl;
+            }
+            if (!tc_.waitToExit()) {
+                return true;
+            }
+        }
+    }
+
+    bool max_requests = false;
+    // Check if we reached maximum number of DISCOVER/SOLICIT sent.
+    if (options_.getNumRequests().size() > 0) {
+        if (stats_mgr.getSentPacketsNum(stage1_xchg_) >=
+            options_.getNumRequests()[0]) {
+            max_requests = true;
+        }
+    }
+    // Check if we reached maximum number REQUEST packets.
+    if (options_.getNumRequests().size() > 1) {
+        if (stats_mgr.getSentPacketsNum(stage2_xchg_) >=
+            options_.getNumRequests()[1]) {
+            max_requests = true;
+        }
+    }
+    if (max_requests) {
+        if (options_.testDiags('e')) {
+            std::cout << "Reached max requests limit." << std::endl;
+        }
+        if (!tc_.waitToExit()) {
+            return true;
+        }
+    }
+
+    // Check if we reached maximum number of drops of OFFER/ADVERTISE packets.
+    bool max_drops = false;
+    if (options_.getMaxDrop().size() > 0) {
+        if (stats_mgr.getDroppedPacketsNum(stage1_xchg_) >=
+            options_.getMaxDrop()[0]) {
+            max_drops = true;
+        }
+    }
+    // Check if we reached maximum number of drops of ACK/REPLY packets.
+    if (options_.getMaxDrop().size() > 1) {
+        if (stats_mgr.getDroppedPacketsNum(stage2_xchg_) >=
+            options_.getMaxDrop()[1]) {
+            max_drops = true;
+        }
+    }
+    if (max_drops) {
+        if (options_.testDiags('e')) {
+            std::cout << "Reached maximum drops number." << std::endl;
+        }
+        if (!tc_.waitToExit()) {
+            return true;
+        }
+    }
+
+    // Check if we reached maximum drops percentage of OFFER/ADVERTISE packets.
+    bool max_pdrops = false;
+    if (options_.getMaxDropPercentage().size() > 0) {
+        if ((stats_mgr.getSentPacketsNum(stage1_xchg_) > 10) &&
+            ((100. * stats_mgr.getDroppedPacketsNum(stage1_xchg_) /
+              stats_mgr.getSentPacketsNum(stage1_xchg_)) >=
+             options_.getMaxDropPercentage()[0]))
+        {
+            max_pdrops = true;
+        }
+    }
+    // Check if we reached maximum drops percentage of ACK/REPLY packets.
+    if (options_.getMaxDropPercentage().size() > 1) {
+        if ((stats_mgr.getSentPacketsNum(stage2_xchg_) > 10) &&
+            ((100. * stats_mgr.getDroppedPacketsNum(stage2_xchg_) /
+              stats_mgr.getSentPacketsNum(stage2_xchg_)) >=
+             options_.getMaxDropPercentage()[1]))
+        {
+            max_pdrops = true;
+        }
+    }
+    if (max_pdrops) {
+        if (options_.testDiags('e')) {
+            std::cout << "Reached maximum percentage of drops." << std::endl;
+        }
+        if (!tc_.waitToExit()) {
+            return true;
+        }
+    }
+    return (false);
+}
+
+int
+BasicScen::run() {
+    StatsMgr& stats_mgr(tc_.getStatsMgr());
+
+    // Preload server with the number of packets.
+    if (options_.getPreload() > 0) {
+        tc_.sendPackets(options_.getPreload(), true);
+    }
+
+    // Fork and run command specified with -w<wrapped-command>
+    if (!options_.getWrapped().empty()) {
+        tc_.runWrapped();
+    }
+
+    tc_.start();
+
+    for (;;) {
+        // Calculate number of packets to be sent to stay
+        // catch up with rate.
+        uint64_t packets_due =
+            basic_rate_control_.getOutboundMessageCount(!tc_.exit_time_.is_not_a_date_time());
+        if ((packets_due == 0) && options_.testDiags('i')) {
+            stats_mgr.incrementCounter("shortwait");
+        }
+
+        // Pull some packets from receiver thread, process them, update some stats
+        // and respond to the server if needed.
+        auto pkt_count = tc_.consumeReceivedPackets();
+
+        // If there is nothing to do in this loop iteration then do some sleep to make
+        // CPU idle for a moment, to not consume 100% CPU all the time
+        // but only if it is not that high request rate expected.
+        if (options_.getRate() < 10000 && packets_due == 0 && pkt_count == 0) {
+            /// @todo: need to implement adaptive time here, so the sleep time
+            /// is not fixed, but adjusts to current situation.
+            usleep(1);
+        }
+
+        // If test period finished, maximum number of packet drops
+        // has been reached or test has been interrupted we have to
+        // finish the test.
+        if (checkExitConditions()) {
+            break;
+        }
+
+        // Initiate new DHCP packet exchanges.
+        tc_.sendPackets(packets_due);
+
+        // If -f<renew-rate> option was specified we have to check how many
+        // Renew packets should be sent to catch up with a desired rate.
+        if (options_.getRenewRate() != 0) {
+            uint64_t renew_packets_due =
+                renew_rate_control_.getOutboundMessageCount(!tc_.exit_time_.is_not_a_date_time());
+
+            // Send multiple renews to satisfy the desired rate.
+            if (options_.getIpVersion() == 4) {
+                tc_.sendMultipleMessages4(DHCPREQUEST, renew_packets_due);
+            } else {
+                tc_.sendMultipleMessages6(DHCPV6_RENEW, renew_packets_due);
+            }
+        }
+
+        // If -F<release-rate> option was specified we have to check how many
+        // Release messages should be sent to catch up with a desired rate.
+        if (options_.getReleaseRate() != 0) {
+            uint64_t release_packets_due =
+                release_rate_control_.getOutboundMessageCount(!tc_.exit_time_.is_not_a_date_time());
+            // Send Release messages.
+
+            if (options_.getIpVersion() == 4) {
+                tc_.sendMultipleMessages4(DHCPRELEASE, release_packets_due);
+            } else {
+                tc_.sendMultipleMessages6(DHCPV6_RELEASE, release_packets_due);
+            }
+        }
+
+        // Report delay means that user requested printing number
+        // of sent/received/dropped packets repeatedly.
+        if (options_.getReportDelay() > 0) {
+            tc_.printIntermediateStats();
+        }
+
+        // If we are sending Renews to the server, the Reply packets are cached
+        // so as leases for which we send Renews can be identified. The major
+        // issue with this approach is that most of the time we are caching
+        // more packets than we actually need. This function removes excessive
+        // Reply messages to reduce the memory and CPU utilization. Note that
+        // searches in the long list of Reply packets increases CPU utilization.
+        tc_.cleanCachedPackets();
+    }
+
+    tc_.stop();
+
+    tc_.printStats();
+
+    if (!options_.getWrapped().empty()) {
+        // true means that we execute wrapped command with 'stop' argument.
+        tc_.runWrapped(true);
+    }
+
+    // Print packet timestamps
+    if (options_.testDiags('t')) {
+        stats_mgr.printTimestamps();
+    }
+
+    // Print server id.
+    if (options_.testDiags('s') && tc_.serverIdReceived()) {
+        std::cout << "Server id: " << tc_.getServerId() << std::endl;
+    }
+
+    // Diagnostics flag 'e' means show exit reason.
+    if (options_.testDiags('e')) {
+        std::cout << "Interrupted" << std::endl;
+    }
+    // Print packet templates. Even if -T options have not been specified the
+    // dynamically build packet will be printed if at least one has been sent.
+    if (options_.testDiags('T')) {
+        tc_.printTemplates();
+    }
+
+    // Print any received leases.
+    if (options_.testDiags('l')) {
+        stats_mgr.printLeases();
+    }
+
+    int ret_code = 0;
+    // Check if any packet drops occurred.
+    ret_code = stats_mgr.droppedPackets() ? 3 : 0;
+    return (ret_code);
+}
+
+}  // namespace perfdhcp
+}  // namespace isc
diff --git a/src/bin/perfdhcp/basic_scen.h b/src/bin/perfdhcp/basic_scen.h
new file mode 100644
index 0000000..b88986d
--- /dev/null
+++ b/src/bin/perfdhcp/basic_scen.h
@@ -0,0 +1,72 @@
+// Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BASIC_SCEN_H
+#define BASIC_SCEN_H
+
+#include <config.h>
+
+#include <perfdhcp/abstract_scen.h>
+
+
+namespace isc {
+namespace perfdhcp {
+
+
+/// \brief Basic Scenario class.
+///
+/// This class is used to run the performance test where DHCP server
+/// is continuously loaded with DHCP messages according to given rate.
+class BasicScen : public AbstractScen {
+public:
+    /// \brief Default and the only constructor of BasicScen.
+    ///
+    /// \param options reference to command options,
+    /// \param socket reference to a socket.
+    BasicScen(CommandOptions& options, BasePerfSocket &socket):
+        AbstractScen(options, socket)
+    {
+        basic_rate_control_.setRate(options_.getRate());
+        renew_rate_control_.setRate(options_.getRenewRate());
+        release_rate_control_.setRate(options_.getReleaseRate());
+    };
+
+    /// brief\ Run performance test.
+    ///
+    /// Method runs whole performance test. Command line options must
+    /// be parsed prior to running this function. Otherwise function will
+    /// throw exception.
+    ///
+    /// \throw isc::InvalidOperation if command line options are not parsed.
+    /// \throw isc::Unexpected if internal Test Controller error occurred.
+    /// \return execution status.
+    int run() override;
+
+protected:
+    /// \brief A rate control class for Discover and Solicit messages.
+    RateControl basic_rate_control_;
+    /// \brief A rate control class for Renew messages.
+    RateControl renew_rate_control_;
+    /// \brief A rate control class for Release messages.
+    RateControl release_rate_control_;
+
+    /// \brief Check if test exit conditions fulfilled.
+    ///
+    /// Method checks if the test exit conditions are fulfilled.
+    /// Exit conditions are checked periodically from the
+    /// main loop. Program should break the main loop when
+    /// this method returns true. It is calling function
+    /// responsibility to break main loop gracefully and
+    /// cleanup after test execution.
+    ///
+    /// \return true if any of the exit conditions is fulfilled.
+    bool checkExitConditions();
+};
+
+}
+}
+
+#endif // BASIC_SCEN_H
diff --git a/src/bin/perfdhcp/command_options.cc b/src/bin/perfdhcp/command_options.cc
new file mode 100644
index 0000000..fa6772e
--- /dev/null
+++ b/src/bin/perfdhcp/command_options.cc
@@ -0,0 +1,1450 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/command_options.h>
+
+#include <asiolink/io_error.h>
+#include <exceptions/exceptions.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcp/duid.h>
+#include <dhcp/option.h>
+#include <process/cfgrpt/config_report.h>
+#include <util/encode/hex.h>
+
+#include <boost/lexical_cast.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <sstream>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fstream>
+#include <thread>
+#include <getopt.h>
+
+#ifdef HAVE_OPTRESET
+extern int optreset;
+#endif
+
+using namespace std;
+using namespace isc;
+using namespace isc::dhcp;
+
+namespace isc {
+namespace perfdhcp {
+
+CommandOptions::LeaseType::LeaseType()
+    : type_(ADDRESS) {
+}
+
+CommandOptions::LeaseType::LeaseType(const Type lease_type)
+    : type_(lease_type) {
+}
+
+bool
+CommandOptions::LeaseType::is(const Type lease_type) const {
+    return (lease_type == type_);
+}
+
+bool
+CommandOptions::LeaseType::includes(const Type lease_type) const {
+    return (is(ADDRESS_AND_PREFIX) || (lease_type == type_));
+}
+
+void
+CommandOptions::LeaseType::set(const Type lease_type) {
+    type_ = lease_type;
+}
+
+void
+CommandOptions::LeaseType::fromCommandLine(const std::string& cmd_line_arg) {
+    if (cmd_line_arg == "address-only") {
+        type_ = ADDRESS;
+
+    } else if (cmd_line_arg == "prefix-only") {
+        type_ = PREFIX;
+
+    } else if (cmd_line_arg == "address-and-prefix") {
+        type_ = ADDRESS_AND_PREFIX;
+
+    } else {
+        isc_throw(isc::InvalidParameter, "value of lease-type: -e<lease-type>,"
+                  " must be one of the following: 'address-only' or"
+                  " 'prefix-only'");
+    }
+}
+
+std::string
+CommandOptions::LeaseType::toText() const {
+    switch (type_) {
+    case ADDRESS:
+        return ("address-only (IA_NA option added to the client's request)");
+    case PREFIX:
+        return ("prefix-only (IA_PD option added to the client's request)");
+    case ADDRESS_AND_PREFIX:
+        return ("address-and-prefix (Both IA_NA and IA_PD options added to the"
+                " client's request)");
+    default:
+        isc_throw(Unexpected, "internal error: undefined lease type code when"
+                  " returning textual representation of the lease type");
+    }
+}
+
+void
+CommandOptions::reset() {
+    // Default mac address used in DHCP messages
+    // if -b mac=<mac-address> was not specified
+    uint8_t mac[6] = { 0x0, 0xC, 0x1, 0x2, 0x3, 0x4 };
+
+    // Default packet drop time if -D<drop-time> parameter
+    // was not specified
+    double dt[2] = { 1., 1. };
+
+    // We don't use constructor initialization list because we
+    // will need to reset all members many times to perform unit tests
+    ipversion_ = 0;
+    exchange_mode_ = DORA_SARR;
+    lease_type_.set(LeaseType::ADDRESS);
+    rate_ = 0;
+    renew_rate_ = 0;
+    release_rate_ = 0;
+    report_delay_ = 0;
+    clean_report_ = false;
+    clean_report_separator_ = "";
+    clients_num_ = 0;
+    mac_template_.assign(mac, mac + 6);
+    duid_template_.clear();
+    base_.clear();
+    addr_unique_ = false;
+    mac_list_file_.clear();
+    mac_list_.clear();
+    relay_addr_list_file_.clear();
+    relay_addr_list_.clear();
+    multi_subnet_ = false;
+    num_request_.clear();
+    exit_wait_time_ = 0;
+    period_ = 0;
+    wait_for_elapsed_time_ = -1;
+    increased_elapsed_time_ = -1;
+    drop_time_set_ = 0;
+    drop_time_.assign(dt, dt + 2);
+    max_drop_.clear();
+    max_pdrop_.clear();
+    localname_.clear();
+    is_interface_ = false;
+    preload_ = 0;
+    local_port_ = 0;
+    remote_port_ = 0;
+    seeded_ = false;
+    seed_ = 0;
+    broadcast_ = false;
+    rapid_commit_ = false;
+    use_first_ = false;
+    template_file_.clear();
+    rnd_offset_.clear();
+    xid_offset_.clear();
+    elp_offset_ = -1;
+    sid_offset_ = -1;
+    rip_offset_ = -1;
+    diags_.clear();
+    wrapped_.clear();
+    server_name_.clear();
+    v6_relay_encapsulation_level_ = 0;
+    generateDuidTemplate();
+    extra_opts_.clear();
+    if (std::thread::hardware_concurrency() == 1) {
+        single_thread_mode_ = true;
+    } else {
+        single_thread_mode_ = false;
+    }
+    scenario_ = Scenario::BASIC;
+    for (uint8_t i = 1; i <= RELAY_OPTIONS_MAX_ENCAPSULATION ; i++) {
+        OptionCollection option_collection;
+        relay_opts_[i] = option_collection;
+    }
+}
+
+bool
+CommandOptions::parse(int argc, char** const argv, bool print_cmd_line) {
+    // Reset internal variables used by getopt
+    // to eliminate undefined behavior when
+    // parsing different command lines multiple times
+
+#ifdef __GLIBC__
+    // Warning: non-portable code. This is due to a bug in glibc's
+    // getopt() which keeps internal state about an old argument vector
+    // (argc, argv) from last call and tries to scan them when a new
+    // argument vector (argc, argv) is passed. As the old vector may not
+    // be main()'s arguments, but heap allocated and may have been freed
+    // since, this becomes a use after free and results in random
+    // behavior. According to the NOTES section in glibc getopt()'s
+    // manpage, setting optind=0 resets getopt()'s state. Though this is
+    // not required in our usage of getopt(), the bug still happens
+    // unless we set optind=0.
+    //
+    // Setting optind=0 is non-portable code.
+    optind = 0;
+#else
+    optind = 1;
+#endif
+
+    // optreset is declared on BSD systems and is used to reset internal
+    // state of getopt(). When parsing command line arguments multiple
+    // times with getopt() the optreset must be set to 1 every time before
+    // parsing starts. Failing to do so will result in random behavior of
+    // getopt().
+#ifdef HAVE_OPTRESET
+    optreset = 1;
+#endif
+
+    opterr = 0;
+
+    // Reset values of class members
+    reset();
+
+    // Informs if program has been run with 'h' or 'v' option.
+    bool help_or_version_mode = initialize(argc, argv, print_cmd_line);
+    if (!help_or_version_mode) {
+        validate();
+    }
+    return (help_or_version_mode);
+}
+
+const int LONG_OPT_SCENARIO = 300;
+const int LONG_OPT_RELAY_OPTION = 400;
+
+bool
+CommandOptions::initialize(int argc, char** argv, bool print_cmd_line) {
+    int opt = 0;                // Subsequent options returned by getopt()
+    int opt_long_index = 0;     // Holds index of long_option inside of long_options[]
+    std::string drop_arg;       // Value of -D<value>argument
+    size_t percent_loc = 0;     // Location of % sign in -D<value>
+    double drop_percent = 0;    // % value (1..100) in -D<value%>
+    int num_drops = 0;          // Max number of drops specified in -D<value>
+    int num_req = 0;            // Max number of dropped
+                                // requests in -n<max-drops>
+    int offset_arg = 0;         // Temporary variable holding offset arguments
+    std::string sarg;           // Temporary variable for string args
+
+    std::ostringstream stream;
+    stream << "perfdhcp";
+    int num_mac_list_files = 0;
+    int num_subnet_list_files = 0;
+
+    struct option long_options[] = {
+        {"scenario", required_argument, 0, LONG_OPT_SCENARIO},
+        {"or",       required_argument, 0, LONG_OPT_RELAY_OPTION},
+        {0,          0,                 0, 0}
+    };
+
+    // In this section we collect argument values from command line
+    // they will be tuned and validated elsewhere
+    while((opt = getopt_long(argc, argv,
+                             "huv46A:r:t:R:b:n:p:d:D:l:P:a:L:N:M:s:iBc1"
+                             "J:T:X:O:o:E:S:I:x:W:w:e:f:F:g:C:y:Y:",
+                             long_options, &opt_long_index)) != -1) {
+        stream << " -";
+        opt <= 'z' ? stream << static_cast<char>(opt) :
+                     stream << "-" << long_options[opt_long_index].name;
+        if (optarg) {
+            stream << " " << optarg;
+        }
+        switch (opt) {
+        case '1':
+            use_first_ = true;
+            break;
+
+        // Simulate DHCPv6 relayed traffic.
+        case 'A':
+            // @todo: At the moment we only support simulating a single relay
+            // agent. In the future we should extend it to up to 32.
+            // See comment in https://github.com/isc-projects/kea/pull/22#issuecomment-243405600
+            v6_relay_encapsulation_level_ =
+                static_cast<uint8_t>(positiveInteger("-A<encapsulation-level> must"
+                                                     " be a positive integer"));
+            if (v6_relay_encapsulation_level_ != 1) {
+                isc_throw(isc::InvalidParameter, "-A only supports 1 at the moment.");
+            }
+            break;
+
+        case 'u':
+            addr_unique_ = true;
+            break;
+
+        case '4':
+            check(ipversion_ == 6, "IP version already set to 6");
+            ipversion_ = 4;
+            break;
+
+        case '6':
+            check(ipversion_ == 4, "IP version already set to 4");
+            ipversion_ = 6;
+            break;
+
+        case 'b':
+            check(base_.size() > 3, "-b<value> already specified,"
+                  " unexpected occurrence of 5th -b<value>");
+            base_.push_back(optarg ? optarg : "");
+            decodeBase(base_.back());
+            break;
+
+        case 'B':
+            broadcast_ = true;
+            break;
+
+        case 'c':
+            rapid_commit_ = true;
+            break;
+
+        case 'C':
+            clean_report_ = true;
+            clean_report_separator_ = optarg ? optarg : "";
+            break;
+
+        case 'd':
+            check(drop_time_set_ > 1,
+                  "maximum number of drops already specified, "
+                  "unexpected 3rd occurrence of -d<value>");
+            try {
+                drop_time_[drop_time_set_] =
+                    boost::lexical_cast<double>(optarg ? optarg : "");
+            } catch (const boost::bad_lexical_cast&) {
+                isc_throw(isc::InvalidParameter,
+                          "value of drop time: -d<value>"
+                          " must be positive number");
+            }
+            check(drop_time_[drop_time_set_] <= 0.,
+                  "drop-time must be a positive number");
+            drop_time_set_ = true;
+            break;
+
+        case 'D':
+            drop_arg = std::string(optarg ? optarg : "");
+            percent_loc = drop_arg.find('%');
+            check(max_pdrop_.size() > 1 || max_drop_.size() > 1,
+                  "values of maximum drops: -D<value> already "
+                  "specified, unexpected 3rd occurrence of -D<value>");
+            if ((percent_loc) != std::string::npos) {
+                try {
+                    drop_percent =
+                        boost::lexical_cast<double>(drop_arg.substr(0, percent_loc));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(isc::InvalidParameter,
+                              "value of drop percentage: -D<value%>"
+                              " must be 0..100");
+                }
+                check((drop_percent <= 0) || (drop_percent >= 100),
+                  "value of drop percentage: -D<value%> must be 0..100");
+                max_pdrop_.push_back(drop_percent);
+            } else {
+                num_drops = positiveInteger("value of max drops number:"
+                                            " -D<value> must be a positive integer");
+                max_drop_.push_back(num_drops);
+            }
+            break;
+
+        case 'e':
+            initLeaseType();
+            break;
+
+        case 'E':
+            elp_offset_ = nonNegativeInteger("value of time-offset: -E<value>"
+                                             " must not be a negative integer");
+            break;
+
+        case 'f':
+            renew_rate_ = positiveInteger("value of the renew rate: -f<renew-rate>"
+                                          " must be a positive integer");
+            break;
+
+        case 'F':
+            release_rate_ = positiveInteger("value of the release rate:"
+                                            " -F<release-rate> must be a"
+                                            " positive integer");
+            break;
+
+        case 'g': {
+            std::string optarg_text(optarg ? optarg : "");
+            if (optarg_text == "single") {
+                single_thread_mode_ = true;
+            } else if (optarg_text == "multi") {
+                single_thread_mode_ = false;
+            } else {
+                if (optarg) {
+                    isc_throw(InvalidParameter, "value of thread mode (-g) '" << optarg << "' is wrong - should be '-g single' or '-g multi'");
+                } else {
+                    isc_throw(InvalidParameter, "value of thread mode (-g) is wrong - should be '-g single' or '-g multi'");
+                }
+            }
+            break;
+        }
+        case 'h':
+            usage();
+            return (true);
+
+        case 'i':
+            exchange_mode_ = DO_SA;
+            break;
+
+        case 'I':
+            rip_offset_ = positiveInteger("value of ip address offset:"
+                                          " -I<value> must be a"
+                                          " positive integer");
+            break;
+
+        case 'J':
+            check(num_subnet_list_files >= 1, "only one -J option can be specified");
+            num_subnet_list_files++;
+            relay_addr_list_file_ = std::string(optarg ? optarg : "");
+            loadRelayAddr();
+            break;
+
+        case 'l':
+            localname_ = std::string(optarg ? optarg : "");
+            initIsInterface();
+            break;
+
+        case 'L':
+             local_port_ = nonNegativeInteger("value of local port:"
+                                              " -L<value> must not be a"
+                                              " negative integer");
+             check(local_port_ >
+                   static_cast<int>(std::numeric_limits<uint16_t>::max()),
+                   "local-port must be lower than " +
+                   boost::lexical_cast<std::string>(std::numeric_limits<uint16_t>::max()));
+            break;
+
+        case 'N':
+             remote_port_ = nonNegativeInteger("value of remote port:"
+                                               " -L<value> must not be a"
+                                               " negative integer");
+             check(remote_port_ >
+                   static_cast<int>(std::numeric_limits<uint16_t>::max()),
+                   "remote-port must be lower than " +
+                   boost::lexical_cast<std::string>(std::numeric_limits<uint16_t>::max()));
+            break;
+
+        case 'M':
+            check(num_mac_list_files >= 1, "only one -M option can be specified");
+            num_mac_list_files++;
+            mac_list_file_ = std::string(optarg ? optarg : "");
+            loadMacs();
+            break;
+
+        case 'W':
+            exit_wait_time_ = nonNegativeInteger("value of exist wait time: "
+                                                  "-W<value> must not be a "
+                                                  "negative integer");
+            break;
+
+        case 'n':
+            num_req = positiveInteger("value of num-request:"
+                                      " -n<value> must be a positive integer");
+            if (num_request_.size() >= 2) {
+                isc_throw(isc::InvalidParameter,
+                          "value of maximum number of requests: -n<value> "
+                          "already specified, unexpected 3rd occurrence"
+                          " of -n<value>");
+            }
+            num_request_.push_back(num_req);
+            break;
+
+        case 'O':
+            if (rnd_offset_.size() < 2) {
+                offset_arg = positiveInteger("value of random offset: "
+                                             "-O<value> must be greater than 3");
+            } else {
+                isc_throw(isc::InvalidParameter,
+                          "random offsets already specified,"
+                          " unexpected 3rd occurrence of -O<value>");
+            }
+            check(offset_arg < 3, "value of random random-offset:"
+                  " -O<value> must be greater than 3 ");
+            rnd_offset_.push_back(offset_arg);
+            break;
+        case 'o': {
+
+            // we must know how to contruct the option: whether it's v4 or v6.
+            check( (ipversion_ != 4) && (ipversion_ != 6),
+                   "-4 or -6 must be explicitly specified before -o is used.");
+
+            // custom option (expected format: code,hexstring)
+            std::string opt_text(optarg ? optarg : "");
+            size_t comma_loc = opt_text.find(',');
+            check(comma_loc == std::string::npos,
+                  "-o option must provide option code, a comma and hexstring for"
+                  " the option content, e.g. -o60,646f63736973 for sending option"
+                  " 60 (class-id) with the value 'docsis'");
+            int code = 0;
+
+            // Try to parse the option code
+            try {
+                code = boost::lexical_cast<int>(opt_text.substr(0, comma_loc));
+                check(code <= 0, "Option code can't be negative");
+            } catch (const boost::bad_lexical_cast&) {
+                isc_throw(InvalidParameter, "Invalid option code specified for "
+                          "-o option, expected format: -o<integer>,<hexstring>");
+            }
+
+            // Now try to interpret the hexstring
+            opt_text = opt_text.substr(comma_loc + 1);
+            std::vector<uint8_t> bin;
+            try {
+                isc::util::encode::decodeHex(opt_text, bin);
+            } catch (const BadValue& e) {
+                isc_throw(InvalidParameter, "Error during encoding option -o:"
+                          << e.what());
+            }
+
+            // Create and remember the option.
+            OptionPtr opt(new Option(ipversion_ == 4 ? Option::V4 : Option::V6,
+                                     code, bin));
+            extra_opts_.insert(make_pair(code, opt));
+            break;
+        }
+        case 'p':
+            period_ = positiveInteger("value of test period:"
+                                      " -p<value> must be a positive integer");
+            break;
+
+        case 'P':
+            preload_ = nonNegativeInteger("number of preload packets:"
+                                          " -P<value> must not be "
+                                          "a negative integer");
+            break;
+
+        case 'r':
+            rate_ = positiveInteger("value of rate:"
+                                    " -r<value> must be a positive integer");
+            break;
+
+        case 'R':
+            initClientsNum();
+            break;
+
+        case 's':
+            seed_ = static_cast<unsigned int>
+                (nonNegativeInteger("value of seed:"
+                                    " -s <seed> must be non-negative integer"));
+            seeded_ = seed_ > 0 ? true : false;
+            break;
+
+        case 'S':
+            sid_offset_ = positiveInteger("value of server id offset:"
+                                          " -S<value> must be a"
+                                          " positive integer");
+            break;
+
+        case 't':
+            report_delay_ = positiveInteger("value of report delay:"
+                                            " -t<value> must be a"
+                                            " positive integer");
+            break;
+
+        case 'T':
+            if (template_file_.size() < 2) {
+                sarg = nonEmptyString("template file name not specified,"
+                                      " expected -T<filename>");
+                template_file_.push_back(sarg);
+            } else {
+                isc_throw(isc::InvalidParameter,
+                          "template files are already specified,"
+                          " unexpected 3rd -T<filename> occurrence");
+            }
+            break;
+
+        case 'v':
+            version();
+            return (true);
+
+        case 'w':
+            wrapped_ = nonEmptyString("command for wrapped mode:"
+                                      " -w<command> must be specified");
+            break;
+
+        case 'x':
+            diags_ = nonEmptyString("value of diagnostics selectors:"
+                                    " -x<value> must be specified");
+            break;
+
+        case 'X':
+            if (xid_offset_.size() < 2) {
+                offset_arg = positiveInteger("value of transaction id:"
+                                             " -X<value> must be a"
+                                             " positive integer");
+            } else {
+                isc_throw(isc::InvalidParameter,
+                          "transaction ids already specified,"
+                          " unexpected 3rd -X<value> occurrence");
+            }
+            xid_offset_.push_back(offset_arg);
+            break;
+
+        case 'Y':
+            wait_for_elapsed_time_ = nonNegativeInteger("value of time:"
+                                     " -Y<value> must be a non negative integer");
+            break;
+
+        case 'y':
+            increased_elapsed_time_ = positiveInteger("value of time:"
+                                      " -y<value> must be a positive integer");
+            break;
+
+        case LONG_OPT_SCENARIO: {
+            std::string optarg_text(optarg ? optarg : "");
+            if (optarg_text == "basic") {
+                scenario_ = Scenario::BASIC;
+            } else if (optarg_text == "avalanche") {
+                scenario_ = Scenario::AVALANCHE;
+            } else {
+                isc_throw(InvalidParameter, "scenario value '" << optarg_text << "' is wrong - should be 'basic' or 'avalanche'");
+            }
+            break;
+        }
+
+        case LONG_OPT_RELAY_OPTION: {
+            // for now this is only available for v6
+            // and must be used together with -A option.
+            check((ipversion_ != 6),
+                  "-6 must be explicitly specified before --or is used.");
+            check(v6_relay_encapsulation_level_ <= 0,
+                  "-A must be explicitly specified before --or is used.");
+
+            // custom option (expected format: encapsulation-level:code,hexstring)
+            std::string opt_text(optarg ? optarg : "");
+            size_t colon_loc = opt_text.find(':');
+            size_t comma_loc = opt_text.find(',');
+
+            // if encapsulation level is skipped by user, let's assume it is 1
+            uint8_t option_encapsulation_level = 1;
+            if (colon_loc == std::string::npos) {
+                // if colon was not found, default encapsulation level will be used
+                // and let's reset colon_loc to -1 so option code could be parsed later
+                colon_loc = -1;
+            } else {
+                // Try to parse the encapsulation level
+                try {
+                    option_encapsulation_level =
+                        boost::lexical_cast<int>(opt_text.substr(0, colon_loc));
+                    check(option_encapsulation_level != 1, "Relayed option encapsulation level "
+                                                           "supports only value 1 at the moment.");
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(InvalidParameter,
+                              "Invalid relayed option encapsulation level specified for "
+                              "--or option, expected format: --or <integer>:<integer>,<hexstring>");
+                }
+            }
+
+            check(comma_loc == std::string::npos,
+                  "--or option must provide encapsulation level, a colon, option code, a comma and "
+                  "hexstring for the option content, e.g. --or 1:38,31323334 for sending option"
+                  " 38 (subscriber-id) with the value 1234 at first level of encapsulation");
+            int code = 0;
+
+            // Try to parse the option code
+            try {
+                code = boost::lexical_cast<int>(
+                    opt_text.substr(colon_loc + 1, comma_loc - colon_loc - 1));
+                check(code <= 0, "Option code can't be negative or zero");
+            } catch (const boost::bad_lexical_cast&) {
+                isc_throw(InvalidParameter,
+                          "Invalid option code specified for "
+                          "--or option, expected format: --or <integer>:<integer>,<hexstring>");
+            }
+
+            // Now try to interpret the hexstring
+            opt_text = opt_text.substr(comma_loc + 1);
+            std::vector<uint8_t> bin;
+            try {
+                isc::util::encode::decodeHex(opt_text, bin);
+            } catch (const BadValue& e) {
+                isc_throw(InvalidParameter, "Error during decoding option --or:" << e.what());
+            }
+
+            // Create and remember the option.
+            OptionPtr option(new Option(Option::V6, code, bin));
+            auto relay_opts = relay_opts_.find(option_encapsulation_level);
+            relay_opts->second.insert(make_pair(code, option));
+            break;
+        }
+        default:
+            isc_throw(isc::InvalidParameter, "wrong command line option");
+        }
+    }
+
+    // If the IP version was not specified in the
+    // command line, assume IPv4.
+    if (ipversion_ == 0) {
+        ipversion_ = 4;
+    }
+
+    // If template packet files specified for both DISCOVER/SOLICIT
+    // and REQUEST/REPLY exchanges make sure we have transaction id
+    // and random duid offsets for both exchanges. We will duplicate
+    // value specified as -X<value> and -R<value> for second
+    // exchange if user did not specified otherwise.
+    if (template_file_.size() > 1) {
+        if (xid_offset_.size() == 1) {
+            xid_offset_.push_back(xid_offset_[0]);
+        }
+        if (rnd_offset_.size() == 1) {
+            rnd_offset_.push_back(rnd_offset_[0]);
+        }
+    }
+
+    // Get server argument
+    // NoteFF02::1:2 and FF02::1:3 are defined in RFC 8415 as
+    // All_DHCP_Relay_Agents_and_Servers and All_DHCP_Servers
+    // addresses
+    check(optind < argc -1, "extra arguments?");
+    if (optind == argc - 1) {
+        server_name_ = argv[optind];
+        stream << " " << server_name_;
+        // Decode special cases
+        if ((ipversion_ == 4) && (server_name_.compare("all") == 0)) {
+            broadcast_ = true;
+            // Use broadcast address as server name.
+            server_name_ = DHCP_IPV4_BROADCAST_ADDRESS;
+        } else if ((ipversion_ == 6) && (server_name_.compare("all") == 0)) {
+            server_name_ = ALL_DHCP_RELAY_AGENTS_AND_SERVERS;
+        } else if ((ipversion_ == 6) &&
+                   (server_name_.compare("servers") == 0)) {
+            server_name_ = ALL_DHCP_SERVERS;
+        }
+    }
+    if (!getCleanReport()) {
+        if (print_cmd_line) {
+            std::cout << "Running: " << stream.str() << std::endl;
+        }
+
+        if (scenario_ == Scenario::BASIC) {
+            std::cout << "Scenario: basic." << std::endl;
+        } else if (scenario_ == Scenario::AVALANCHE) {
+            std::cout << "Scenario: avalanche." << std::endl;
+        }
+
+        if (!isSingleThreaded()) {
+            std::cout << "Multi-thread mode enabled." << std::endl;
+        }
+    }
+
+    // Handle the local '-l' address/interface
+    if (!localname_.empty()) {
+        if (server_name_.empty()) {
+            if (is_interface_ && (ipversion_ == 4)) {
+                broadcast_ = true;
+                server_name_ = DHCP_IPV4_BROADCAST_ADDRESS;
+            } else if (is_interface_ && (ipversion_ == 6)) {
+                server_name_ = ALL_DHCP_RELAY_AGENTS_AND_SERVERS;
+            }
+        }
+    }
+    if (server_name_.empty()) {
+        isc_throw(InvalidParameter,
+                  "without an interface, server is required");
+    }
+
+    // If DUID is not specified from command line we need to
+    // generate one.
+    if (duid_template_.empty()) {
+        generateDuidTemplate();
+    }
+    return (false);
+}
+
+void
+CommandOptions::initClientsNum() {
+    const std::string errmsg =
+        "value of -R <value> must be non-negative integer";
+
+    try {
+        // Declare clients_num as a 64-bit signed value to
+        // be able to detect negative values provided
+        // by user. We would not detect negative values
+        // if we casted directly to unsigned value.
+        long long clients_num = boost::lexical_cast<long long>(optarg ? optarg : "");
+        check(clients_num < 0, errmsg);
+        clients_num_ = boost::lexical_cast<uint32_t>(optarg ? optarg : "");
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(isc::InvalidParameter, errmsg);
+    }
+}
+
+void
+CommandOptions::initIsInterface() {
+    is_interface_ = false;
+    if (!localname_.empty()) {
+        dhcp::IfaceMgr& iface_mgr = dhcp::IfaceMgr::instance();
+        if (iface_mgr.getIface(localname_) != NULL)  {
+            is_interface_ = true;
+        }
+    }
+}
+
+void
+CommandOptions::decodeBase(const std::string& base) {
+    std::string b(base);
+    boost::algorithm::to_lower(b);
+
+    // Currently we only support mac and duid
+    if ((b.substr(0, 4) == "mac=") || (b.substr(0, 6) == "ether=")) {
+        decodeMacBase(b);
+    } else if (b.substr(0, 5) == "duid=") {
+        decodeDuid(b);
+    } else {
+        isc_throw(isc::InvalidParameter,
+                  "base value not provided as -b<value>,"
+                  " expected -b mac=<mac> or -b duid=<duid>");
+    }
+}
+
+void
+CommandOptions::decodeMacBase(const std::string& base) {
+    // Strip string from mac=
+    size_t found = base.find('=');
+    static const char* errmsg = "expected -b<base> format for"
+        " mac address is -b mac=00::0C::01::02::03::04 or"
+        " -b mac=00:0C:01:02:03:04";
+    check(found == std::string::npos, errmsg);
+
+    // Decode mac address to vector of uint8_t
+    std::istringstream s1(base.substr(found + 1));
+    std::string token;
+    mac_template_.clear();
+    // Get pieces of MAC address separated with : (or even ::)
+    while (std::getline(s1, token, ':')) {
+        // Convert token to byte value using std::istringstream
+        if (token.length() > 0) {
+            unsigned int ui = 0;
+            try {
+                // Do actual conversion
+                ui = convertHexString(token);
+            } catch (const isc::InvalidParameter&) {
+                isc_throw(isc::InvalidParameter,
+                          "invalid characters in MAC provided");
+
+            }
+            // If conversion succeeded store byte value
+            mac_template_.push_back(ui);
+        }
+    }
+    // MAC address must consist of 6 octets, otherwise it is invalid
+    check(mac_template_.size() != 6, errmsg);
+}
+
+void
+CommandOptions::decodeDuid(const std::string& base) {
+    // Strip argument from duid=
+    std::vector<uint8_t> duid_template;
+    size_t found = base.find('=');
+    check(found == std::string::npos, "expected -b<base>"
+          " format for duid is -b duid=<duid>");
+    std::string b = base.substr(found + 1);
+
+    // DUID must have even number of digits and must not be longer than 64 bytes
+    check(b.length() & 1, "odd number of hexadecimal digits in duid");
+    check(b.length() > 128, "duid too large");
+    check(b.length() == 0, "no duid specified");
+
+    // Turn pairs of hexadecimal digits into vector of octets
+    for (size_t i = 0; i < b.length(); i += 2) {
+        unsigned int ui = 0;
+        try {
+            // Do actual conversion
+            ui = convertHexString(b.substr(i, 2));
+        } catch (const isc::InvalidParameter&) {
+            isc_throw(isc::InvalidParameter,
+                      "invalid characters in DUID provided,"
+                      " expected hex digits");
+        }
+        duid_template.push_back(static_cast<uint8_t>(ui));
+    }
+    // @todo Get rid of this limitation when we manage add support
+    // for DUIDs other than LLT. Shorter DUIDs may be useful for
+    // server testing purposes.
+    check(duid_template.size() < 6, "DUID must be at least 6 octets long");
+    // Assign the new duid only if successfully generated.
+    std::swap(duid_template, duid_template_);
+}
+
+void
+CommandOptions::generateDuidTemplate() {
+    using namespace boost::posix_time;
+    // Duid template will be most likely generated only once but
+    // it is ok if it is called more then once so we simply
+    //  regenerate it and discard previous value.
+    duid_template_.clear();
+    const uint8_t duid_template_len = 14;
+    duid_template_.resize(duid_template_len);
+    // The first four octets consist of DUID LLT and hardware type.
+    duid_template_[0] = static_cast<uint8_t>(static_cast<uint16_t>(isc::dhcp::DUID::DUID_LLT) >> 8);
+    duid_template_[1] = static_cast<uint8_t>(static_cast<uint16_t>(isc::dhcp::DUID::DUID_LLT) & 0xff);
+    duid_template_[2] = HWTYPE_ETHERNET >> 8;
+    duid_template_[3] = HWTYPE_ETHERNET & 0xff;
+
+    // As described in RFC 8415: 'the time value is the time
+    // that the DUID is generated represented in seconds
+    // since midnight (UTC), January 1, 2000, modulo 2^32.'
+    ptime now = microsec_clock::universal_time();
+    ptime duid_epoch(from_iso_string("20000101T000000"));
+    time_period period(duid_epoch, now);
+    uint32_t duration_sec = htonl(period.length().total_seconds());
+    memcpy(&duid_template_[4], &duration_sec, 4);
+
+    // Set link layer address (6 octets). This value may be
+    // randomized before sending a packet to simulate different
+    // clients.
+    memcpy(&duid_template_[8], &mac_template_[0], 6);
+}
+
+const isc::dhcp::OptionCollection&
+CommandOptions::getRelayOpts(uint8_t encapsulation_level) const {
+    if (encapsulation_level > RELAY_OPTIONS_MAX_ENCAPSULATION) {
+        isc_throw(isc::OutOfRange,
+                  "Trying to access relay options at encapsulation level that doesn't exist");
+    }
+
+    return relay_opts_.find(encapsulation_level)->second;
+}
+
+uint8_t
+CommandOptions::convertHexString(const std::string& text) const {
+    unsigned int ui = 0;
+    // First, check if we are dealing with hexadecimal digits only
+    for (size_t i = 0; i < text.length(); ++i) {
+        if (!std::isxdigit(text[i])) {
+            isc_throw(isc::InvalidParameter,
+                      "The following digit: " << text[i] << " in "
+                      << text << "is not hexadecimal");
+        }
+    }
+    // If we are here, we have valid string to convert to octet
+    std::istringstream text_stream(text);
+    text_stream >> std::hex >> ui >> std::dec;
+    // Check if for some reason we have overflow - this should never happen!
+    if (ui > 0xFF) {
+        isc_throw(isc::InvalidParameter, "Can't convert more than"
+                  " two hex digits to byte");
+    }
+    return ui;
+}
+
+bool CommandOptions::validateIP(const std::string& line) {
+    try {
+        isc::asiolink::IOAddress ip_address(line);
+        if ((getIpVersion() == 4 && !ip_address.isV4()) ||
+            (getIpVersion() == 6 && !ip_address.isV6())) {
+            return (true);
+        }
+    } catch (const isc::asiolink::IOError& e) {
+        return (true);
+    }
+    relay_addr_list_.push_back(line);
+    multi_subnet_ = true;
+    return (false);
+}
+
+void CommandOptions::loadRelayAddr() {
+    std::string line;
+    std::ifstream infile(relay_addr_list_file_.c_str());
+    size_t cnt = 0;
+    while (std::getline(infile, line)) {
+        cnt++;
+        stringstream tmp;
+        tmp << "invalid address or wrong address version in line: " << cnt;
+        check(validateIP(line), tmp.str());
+    }
+    check(cnt == 0, "file with addresses is empty!");
+}
+
+void CommandOptions::loadMacs() {
+    std::string line;
+    std::ifstream infile(mac_list_file_.c_str());
+    size_t cnt = 0;
+    while (std::getline(infile, line)) {
+        cnt++;
+        stringstream tmp;
+        tmp << "invalid mac in input line " << cnt;
+        // Let's print more meaningful error that contains line with error.
+        check(decodeMacString(line), tmp.str());
+    }
+}
+
+bool CommandOptions::decodeMacString(const std::string& line) {
+  // decode mac string into a vector of uint8_t returns true in case of error.
+  std::istringstream s(line);
+  std::string token;
+  std::vector<uint8_t> mac;
+  while(std::getline(s, token, ':')) {
+    // Convert token to byte value using std::istringstream
+    if (token.length() > 0) {
+      unsigned int ui = 0;
+      try {
+        // Do actual conversion
+        ui = convertHexString(token);
+      } catch (const isc::InvalidParameter&) {
+        return (true);
+      }
+      // If conversion succeeded store byte value
+      mac.push_back(ui);
+    }
+  }
+  mac_list_.push_back(mac);
+  return (false);
+}
+
+void
+CommandOptions::validate() {
+    check((getIpVersion() != 4) && (isBroadcast() != 0),
+          "-B is not compatible with IPv6 (-6)");
+    check((getIpVersion() != 6) && (isRapidCommit() != 0),
+          "-6 (IPv6) must be set to use -c");
+    check(getIpVersion() == 4 && isUseRelayedV6(),
+          "Can't use -4 with -A, it's a V6 only option.");
+    check((getExchangeMode() == DO_SA) && (getNumRequests().size() > 1),
+          "second -n<num-request> is not compatible with -i");
+    check((getIpVersion() == 4) && !getLeaseType().is(LeaseType::ADDRESS),
+          "-6 option must be used if lease type other than '-e address-only'"
+          " is specified");
+    check(!getTemplateFiles().empty() &&
+          !getLeaseType().is(LeaseType::ADDRESS),
+          "template files may be only used with '-e address-only'");
+    check((getExchangeMode() == DO_SA) && (getDropTime()[1] != 1.),
+          "second -d<drop-time> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) &&
+          ((getMaxDrop().size() > 1) || (getMaxDropPercentage().size() > 1)),
+          "second -D<max-drop> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (isUseFirst()),
+          "-1 is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getTemplateFiles().size() > 1),
+          "second -T<template-file> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getTransactionIdOffset().size() > 1),
+          "second -X<xid-offset> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getRandomOffset().size() > 1),
+          "second -O<random-offset is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getElapsedTimeOffset() >= 0),
+          "-E<time-offset> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getServerIdOffset() >= 0),
+          "-S<srvid-offset> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getRequestedIpOffset() >= 0),
+          "-I<ip-offset> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getRenewRate() != 0),
+          "-f<renew-rate> is not compatible with -i");
+    check((getExchangeMode() == DO_SA) && (getReleaseRate() != 0),
+          "-F<release-rate> is not compatible with -i");
+    check((getExchangeMode() != DO_SA) && (isRapidCommit() != 0),
+          "-i must be set to use -c");
+    check((getRate() != 0) && (getRenewRate() + getReleaseRate() > getRate()),
+          "The sum of Renew rate (-f<renew-rate>) and Release rate"
+          " (-F<release-rate>) must not be greater than the exchange"
+          " rate specified as -r<rate>");
+    check((getRate() == 0) && (getRenewRate() != 0),
+          "Renew rate specified as -f<renew-rate> must not be specified"
+          " when -r<rate> parameter is not specified");
+    check((getRate() == 0) && (getReleaseRate() != 0),
+          "Release rate specified as -F<release-rate> must not be specified"
+          " when -r<rate> parameter is not specified");
+    check((getTemplateFiles().size() < getTransactionIdOffset().size()),
+          "-T<template-file> must be set to use -X<xid-offset>");
+    check((getTemplateFiles().size() < getRandomOffset().size()),
+          "-T<template-file> must be set to use -O<random-offset>");
+    check((getTemplateFiles().size() < 2) && (getElapsedTimeOffset() >= 0),
+          "second/request -T<template-file> must be set to use -E<time-offset>");
+    check((getTemplateFiles().size() < 2) && (getServerIdOffset() >= 0),
+          "second/request -T<template-file> must be set to "
+          "use -S<srvid-offset>");
+    check((getTemplateFiles().size() < 2) && (getRequestedIpOffset() >= 0),
+          "second/request -T<template-file> must be set to "
+          "use -I<ip-offset>");
+    check((!getMacListFile().empty() && base_.size() > 0),
+          "Can't use -b with -M option");
+    check((getWaitForElapsedTime() == -1 && getIncreaseElapsedTime() != -1),
+	  "Option -y can't be used without -Y");
+    check((getWaitForElapsedTime() != -1 && getIncreaseElapsedTime() == -1),
+	  "Option -Y can't be used without -y");
+    auto nthreads = std::thread::hardware_concurrency();
+    if (nthreads == 1 && isSingleThreaded() == false) {
+        std::cout << "WARNING: Currently system can run only 1 thread in parallel." << std::endl
+                  << "WARNING: Better results are achieved when run in single-threaded mode." << std::endl
+                  << "WARNING: To switch use -g single option." << std::endl;
+    } else if (nthreads > 1 && isSingleThreaded()) {
+        std::cout << "WARNING: Currently system can run more than 1 thread in parallel." << std::endl
+                  << "WARNING: Better results are achieved when run in multi-threaded mode." << std::endl
+                  << "WARNING: To switch use -g multi option." << std::endl;
+    }
+
+    if (scenario_ == Scenario::AVALANCHE) {
+        check(getClientsNum() <= 0,
+              "in case of avalanche scenario number\nof clients must be specified"
+              " using -R option explicitly");
+
+        // in case of AVALANCHE drops ie. long responses should not be observed by perfdhcp
+        double dt[2] = { 1000.0, 1000.0 };
+        drop_time_.assign(dt, dt + 2);
+        if (drop_time_set_) {
+            std::cout << "INFO: in avalanche scenario drop time is ignored" << std::endl;
+        }
+    }
+}
+
+void
+CommandOptions::check(bool condition, const std::string& errmsg) const {
+    // The same could have been done with macro or just if statement but
+    // we prefer functions to macros here
+    std::ostringstream stream;
+    stream << errmsg << "\n";
+    if (condition) {
+        isc_throw(isc::InvalidParameter, errmsg);
+    }
+}
+
+int
+CommandOptions::positiveInteger(const std::string& errmsg) const {
+    try {
+        int value = boost::lexical_cast<int>(optarg ? optarg : "");
+        check(value <= 0, errmsg);
+        return (value);
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(InvalidParameter, errmsg);
+    }
+}
+
+int
+CommandOptions::nonNegativeInteger(const std::string& errmsg) const {
+    try {
+        int value = boost::lexical_cast<int>(optarg ? optarg : "");
+        check(value < 0, errmsg);
+        return (value);
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(InvalidParameter, errmsg);
+    }
+}
+
+std::string
+CommandOptions::nonEmptyString(const std::string& errmsg) const {
+    std::string sarg(optarg ? optarg : "");
+    if (sarg.length() == 0) {
+        isc_throw(isc::InvalidParameter, errmsg);
+    }
+    return sarg;
+}
+
+void
+CommandOptions::initLeaseType() {
+    std::string lease_type_arg(optarg ? optarg : "");
+    lease_type_.fromCommandLine(lease_type_arg);
+}
+
+void
+CommandOptions::printCommandLine() const {
+    std::cout << "IPv" << static_cast<int>(ipversion_) << std::endl;
+    if (exchange_mode_ == DO_SA) {
+        if (ipversion_ == 4) {
+            std::cout << "DISCOVER-OFFER only" << std::endl;
+        } else {
+            std::cout << "SOLICIT-ADVERTISE only" << std::endl;
+        }
+    }
+    std::cout << "lease-type=" << getLeaseType().toText() << std::endl;
+    if (rate_ != 0) {
+        std::cout << "rate[1/s]=" << rate_ <<  std::endl;
+    }
+    if (getRenewRate() != 0) {
+        std::cout << "renew-rate[1/s]=" << getRenewRate() << std::endl;
+    }
+    if (getReleaseRate() != 0) {
+        std::cout << "release-rate[1/s]=" << getReleaseRate() << std::endl;
+    }
+    if (report_delay_ != 0) {
+        std::cout << "report[s]=" << report_delay_ << std::endl;
+    }
+    if (clients_num_ != 0) {
+        std::cout << "clients=" << clients_num_ << std::endl;
+    }
+    for (size_t i = 0; i < base_.size(); ++i) {
+        std::cout << "base[" << i << "]=" << base_[i] <<  std::endl;
+    }
+    for (size_t i = 0; i < num_request_.size(); ++i) {
+        std::cout << "num-request[" << i << "]=" << num_request_[i] << std::endl;
+    }
+    if (period_ != 0) {
+        std::cout << "test-period=" << period_ << std::endl;
+    }
+    for (size_t i = 0; i < drop_time_.size(); ++i) {
+        std::cout << "drop-time[" << i << "]=" << drop_time_[i] << std::endl;
+    }
+    for (size_t i = 0; i < max_drop_.size(); ++i) {
+        std::cout << "max-drop{" << i << "]=" << max_drop_[i] << std::endl;
+    }
+    for (size_t i = 0; i < max_pdrop_.size(); ++i) {
+        std::cout << "max-pdrop{" << i << "]=" << max_pdrop_[i] << std::endl;
+    }
+    if (preload_ != 0) {
+        std::cout << "preload=" << preload_ <<  std::endl;
+    }
+    if (getLocalPort() != 0) {
+        std::cout << "local-port=" << local_port_ <<  std::endl;
+    }
+    if (getRemotePort() != 0) {
+        std::cout << "remote-port=" << remote_port_ <<  std::endl;
+    }
+    if (seeded_) {
+        std::cout << "seed=" << seed_ << std::endl;
+    }
+    if (broadcast_) {
+        std::cout << "broadcast" << std::endl;
+    }
+    if (rapid_commit_) {
+        std::cout << "rapid-commit" << std::endl;
+    }
+    if (use_first_) {
+        std::cout << "use-first" << std::endl;
+    }
+    if (!mac_list_file_.empty()) {
+        std::cout << "mac-list-file=" << mac_list_file_ << std::endl;
+    }
+    for (size_t i = 0; i < template_file_.size(); ++i) {
+        std::cout << "template-file[" << i << "]=" << template_file_[i] << std::endl;
+    }
+    for (size_t i = 0; i < xid_offset_.size(); ++i) {
+        std::cout << "xid-offset[" << i << "]=" << xid_offset_[i] << std::endl;
+    }
+    if (elp_offset_ != 0) {
+        std::cout << "elp-offset=" << elp_offset_ << std::endl;
+    }
+    for (size_t i = 0; i < rnd_offset_.size(); ++i) {
+        std::cout << "rnd-offset[" << i << "]=" << rnd_offset_[i] << std::endl;
+    }
+    if (sid_offset_ != 0) {
+        std::cout << "sid-offset=" << sid_offset_ << std::endl;
+    }
+    if (rip_offset_ != 0) {
+        std::cout << "rip-offset=" << rip_offset_ << std::endl;
+    }
+    if (!diags_.empty()) {
+        std::cout << "diagnostic-selectors=" << diags_ <<  std::endl;
+    }
+    if (!wrapped_.empty()) {
+        std::cout << "wrapped=" << wrapped_ << std::endl;
+    }
+    if (!localname_.empty()) {
+        if (is_interface_) {
+            std::cout << "interface=" << localname_ << std::endl;
+        } else {
+            std::cout << "local-addr=" << localname_ << std::endl;
+        }
+    }
+    if (!server_name_.empty()) {
+        std::cout << "server=" << server_name_ << std::endl;
+    }
+    if (single_thread_mode_) {
+        std::cout << "single-thread-mode" << std::endl;
+    } else {
+        std::cout << "multi-thread-mode" << std::endl;
+    }
+}
+
+void
+CommandOptions::usage() {
+    std::cout <<
+R"(perfdhcp [-1] [-4 | -6] [-A encapsulation-level] [-b base] [-B] [-c]
+         [-C separator] [-d drop-time] [-D max-drop] [-e lease-type]
+         [-E time-offset] [-f renew-rate] [-F release-rate] [-g thread-mode]
+         [-h] [-i] [-I ip-offset] [-J remote-address-list-file]
+         [-l local-address|interface] [-L local-port] [-M mac-list-file]
+         [-n num-request] [-N remote-port] [-O random-offset]
+         [-o code,hexstring] [--or encapsulation-level:code,hexstring]
+         [-p test-period] [-P preload] [-r rate]
+         [-R num-clients] [-s seed] [-S srvid-offset] [--scenario name]
+         [-t report] [-T template-file] [-u] [-v] [-W exit-wait-time]
+         [-w script_name] [-x diagnostic-selector] [-X xid-offset] [server]
+
+The [server] argument is the name/address of the DHCP server to
+contact.  For DHCPv4 operation, exchanges are initiated by
+transmitting a DHCP DISCOVER to this address.
+
+For DHCPv6 operation, exchanges are initiated by transmitting a DHCP
+SOLICIT to this address.  In the DHCPv6 case, the special name 'all'
+can be used to refer to All_DHCP_Relay_Agents_and_Servers (the
+multicast address FF02::1:2), or the special name 'servers' to refer
+to All_DHCP_Servers (the multicast address FF05::1:3).  The [server]
+argument is optional only in the case that -l is used to specify an
+interface, in which case [server] defaults to 'all'.
+
+The default is to perform a single 4-way exchange, effectively pinging
+the server.
+The -r option is used to set up a performance test, without
+it exchanges are initiated as fast as possible.
+The other scenario is an avalanche which is selected by
+--scenario avalanche. It first sends as many Discovery or Solicit
+messages as request in -R option then back off mechanism is used for
+each simulated client until all requests are answered. At the end
+time of whole scenario is reported.
+
+Options:
+-1: Take the server-ID option from the first received message.
+-4: DHCPv4 operation (default). This is incompatible with the -6 option.
+-6: DHCPv6 operation. This is incompatible with the -4 option.
+-b<base>: The base mac, duid, IP, etc, used to simulate different
+    clients.  This can be specified multiple times, each instance is
+    in the <type>=<value> form, for instance:
+    (and default) mac=00:0c:01:02:03:04.
+-d<drop-time>: Specify the time after which a request is treated as
+    having been lost.  The value is given in seconds and may contain a
+    fractional component.  The default is 1 second.
+-e<lease-type>: A type of lease being requested from the server. It
+    may be one of the following: address-only, prefix-only or
+    address-and-prefix. The address-only indicates that the regular
+    address (v4 or v6) will be requested. The prefix-only indicates
+    that the IPv6 prefix will be requested. The address-and-prefix
+    indicates that both IPv6 address and prefix will be requested.
+    The '-e prefix-only' and -'e address-and-prefix' must not be
+    used with -4.
+-E<time-offset>: Offset of the (DHCPv4) secs field / (DHCPv6)
+    elapsed-time option in the (second/request) template.
+    The value 0 disables it.
+-F<release-rate>: Rate at which Release requests are sent to
+    a server. This value is only valid when used in conjunction with
+    the exchange rate (given by -r<rate>).  Furthermore the sum of
+    this value and the renew-rate (given by -f<rate>) must be equal
+    to or less than the exchange rate.
+-f<renew-rate>: Rate at which DHCPv4 or DHCPv6 renew requests are sent
+    to a server. This value is only valid when used in conjunction
+    with the exchange rate (given by -r<rate>).  Furthermore the sum of
+    this value and the release-rate (given by -F<rate>) must be equal
+    to or less than the exchange rate.
+-g<thread-mode>: 'single' or 'multi'. In multi-thread mode packets
+    are received in separate thread. This allows better utilisation of CPUs.
+    If more than 1 CPU is present then multi-thread mode is the default,
+    otherwise single-thread is the default.
+-h: Print this help.
+-i: Do only the initial part of an exchange: DO or SA, depending on
+    whether -6 is given.
+-I<ip-offset>: Offset of the (DHCPv4) IP address in the requested-IP
+    option / (DHCPv6) IA_NA option in the (second/request) template.
+-J<remote-address-list-file>: Text file that include multiple addresses.
+    If provided perfdhcp will choose randomly one of addresses for each
+    exchange.
+-l<local-addr|interface>: For DHCPv4 operation, specify the local
+    hostname/address to use when communicating with the server.  By
+    default, the interface address through which traffic would
+    normally be routed to the server is used.
+    For DHCPv6 operation, specify the name of the network interface
+    via which exchanges are initiated.
+-L<local-port>: Specify the local port to use
+    (the value 0 means to use the default).
+-M<mac-list-file>: A text file containing a list of MAC addresses,
+   one per line. If provided, a MAC address will be chosen randomly
+   from this list for every new exchange. In the DHCPv6 case, MAC
+   addresses are used to generate DUID-LLs. This parameter must not be
+   used in conjunction with the -b parameter.
+-N<remote-port>: Specify the remote port to use
+    (the value 0 means to use the default).
+-o<code,hexstring>: Send custom option with the specified code and the
+    specified buffer in hexstring format.
+-O<random-offset>: Offset of the last octet to randomize in the template.
+-P<preload>: Initiate first <preload> exchanges back to back at startup.
+-r<rate>: Initiate <rate> DORA/SARR (or if -i is given, DO/SA)
+    exchanges per second.  A periodic report is generated showing the
+    number of exchanges which were not completed, as well as the
+    average response latency.  The program continues until
+    interrupted, at which point a final report is generated.
+-R<range>: Specify how many different clients are used. With 1
+    (the default), all requests seem to come from the same client.
+-s<seed>: Specify the seed for randomization, making it repeatable.
+--scenario <name>: where name is 'basic' (default) or 'avalanche'.
+-S<srvid-offset>: Offset of the server-ID option in the
+    (second/request) template.
+-T<template-file>: The name of a file containing the template to use
+    as a stream of hexadecimal digits.
+-u: Enable checking address uniqueness. Lease valid lifetime should not be
+    shorter than test duration and clients should not request address more than
+    once without releasing it first.
+-v: Report the version number of this program.
+-W<time>: Specifies exit-wait-time parameter, that makes perfdhcp wait
+    for <time> us after an exit condition has been met to receive all
+    packets without sending any new packets. Expressed in microseconds.
+-w<wrapped>: Command to call with start/stop at the beginning/end of
+    the program.
+-x<diagnostic-selector>: Include extended diagnostics in the output.
+    <diagnostic-selector> is a string of single-keywords specifying
+    the operations for which verbose output is desired.  The selector
+    key letters are:
+   * 'a': print the decoded command line arguments
+   * 'e': print the exit reason
+   * 'i': print rate processing details
+   * 'l': print received leases
+   * 's': print first server-id
+   * 't': when finished, print timers of all successful exchanges
+   * 'T': when finished, print templates
+-X<xid-offset>: Transaction ID (aka. xid) offset in the template.
+-Y<time>: time in seconds after which perfdhcp will start sending
+    messages with increased elapsed time option.
+-y<time>: period of time in seconds in which perfdhcp will be sending
+    messages with increased elapsed time option.
+DHCPv4 only options:
+-B: Force broadcast handling.
+
+DHCPv6 only options:
+-c: Add a rapid commit option (exchanges will be SA).
+-A<encapsulation-level>: Specifies that relayed traffic must be
+    generated. The argument specifies the level of encapsulation, i.e.
+    how many relay agents are simulated. Currently the only supported
+    <encapsulation-level> value is 1, which means that the generated
+    traffic is an equivalent of the traffic passing through a single
+    relay agent.
+--or encapsulation-level:<code,hexstring>: Send given option included
+    to simulated DHCPv6 relayed traffic at given level of encapsulation
+    with the specified code and the specified buffer in hexstring format.
+    Currently the only supported encapsulation-level value is 1.
+    Must be used together with -A.
+
+The remaining options are typically used in conjunction with -r:
+
+-D<max-drop>: Abort the test immediately if max-drop requests have
+    been dropped.  max-drop must be a positive integer. If max-drop
+    includes the suffix '%', it specifies a maximum percentage of
+    requests that may be dropped before abort. In this case, testing
+    of the threshold begins after 10 requests have been expected to
+    be received.
+-n<num-request>: Initiate <num-request> transactions.  No report is
+    generated until all transactions have been initiated/waited-for,
+    after which a report is generated and the program terminates.
+-p<test-period>: Send requests for the given test period, which is
+    specified in the same manner as -d.  This can be used as an
+    alternative to -n, or both options can be given, in which case the
+    testing is completed when either limit is reached.
+-t<report>: Delay in seconds between two periodic reports.
+-C<separator>: Output reduced, an argument is a separator for periodic
+    (-t) reports generated in easy parsable mode. Data output won't be
+    changed, remain identical as in -t option.
+
+Errors:
+- tooshort: received a too short message
+- orphans: received a message which doesn't match an exchange
+   (duplicate, late or not related)
+- locallimit: reached to local system limits when sending a message.
+
+Exit status:
+The exit status is:
+0 on complete success.
+1 for a general error.
+2 if an error is found in the command line arguments.
+3 if there are no general failures in operation, but one or more
+  exchanges are not successfully completed.
+)";
+}
+
+void
+CommandOptions::version() const {
+    std::cout << "VERSION: " << VERSION << std::endl;
+}
+
+
+}  // namespace perfdhcp
+}  // namespace isc
diff --git a/src/bin/perfdhcp/command_options.h b/src/bin/perfdhcp/command_options.h
new file mode 100644
index 0000000..d47f6a1
--- /dev/null
+++ b/src/bin/perfdhcp/command_options.h
@@ -0,0 +1,780 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef COMMAND_OPTIONS_H
+#define COMMAND_OPTIONS_H
+
+#include <dhcp/option.h>
+
+#include <boost/noncopyable.hpp>
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+namespace isc {
+namespace perfdhcp {
+
+enum class Scenario {
+    BASIC,
+    AVALANCHE
+};
+
+/// \brief Command Options.
+///
+/// This class is responsible for parsing the command-line and storing the
+/// specified options.
+///
+class CommandOptions : public boost::noncopyable {
+public:
+
+    /// \brief Default Constructor.
+    ///
+    /// Private constructor as this is a singleton class.
+    /// Use CommandOptions::instance() to get instance of it.
+    CommandOptions() {
+        reset();
+    }
+
+    /// @brief A vector holding MAC addresses.
+    typedef std::vector<std::vector<uint8_t> > MacAddrsVector;
+
+    /// @brief Maximum allowed level of encapsulation of added relay options.
+    const static uint8_t RELAY_OPTIONS_MAX_ENCAPSULATION = 1;
+
+    /// \brief A class encapsulating the type of lease being requested from the
+    /// server.
+    ///
+    /// This class comprises convenience functions to convert the lease type
+    /// to the textual format and to match the appropriate lease type with the
+    /// value of the -e<lease-type> parameter specified from the command line.
+    class LeaseType {
+    public:
+
+        /// The lease type code.
+        enum Type {
+            ADDRESS,
+            PREFIX,
+            ADDRESS_AND_PREFIX
+        };
+
+        LeaseType();
+
+        /// \brief Constructor from lease type code.
+        ///
+        /// \param lease_type A lease type code.
+        LeaseType(const Type lease_type);
+
+        /// \brief Checks if lease type has the specified code.
+        ///
+        /// \param lease_type A lease type code to be checked.
+        ///
+        /// \return true if lease type is matched with the specified code.
+        bool is(const Type lease_type) const;
+
+        /// \brief Checks if lease type implies request for the address,
+        /// prefix (or both) as specified by the function argument.
+        ///
+        /// This is a convenience function to check that, for the lease type
+        /// specified from the command line, the address or prefix
+        /// (IA_NA or IA_PD) option should be sent to the server.
+        /// For example, if user specified '-e address-and-prefix' in the
+        /// command line this function will return true for both ADDRESS
+        /// and PREFIX, because both address and prefix is requested from
+        /// the server.
+        ///
+        /// \param lease_type A lease type.
+        ///
+        /// \return true if the lease type implies creation of the address,
+        /// prefix or both as specified by the argument.
+        bool includes(const Type lease_type) const;
+
+        /// \brief Sets the lease type code.
+        ///
+        /// \param lease_type A lease type code.
+        void set(const Type lease_type);
+
+        /// \brief Sets the lease type from the command line argument.
+        ///
+        /// \param cmd_line_arg An argument specified in the command line
+        /// as -e<lease-type>:
+        /// - address-only
+        /// - prefix-only
+        ///
+        /// \throw isc::InvalidParameter if the specified argument is invalid.
+        void fromCommandLine(const std::string& cmd_line_arg);
+
+        /// \brief Return textual representation of the lease type.
+        ///
+        /// \return A textual representation of the lease type.
+        std::string toText() const;
+
+    private:
+        Type type_; ///< A lease type code.
+
+    };
+
+    /// 2-way (cmd line param -i) or 4-way exchanges
+    enum ExchangeMode {
+        DO_SA,
+        DORA_SARR
+    };
+
+    /// \brief Reset to defaults.
+    ///
+    /// Reset data members to default values. This is specifically
+    /// useful when unit tests are performed using different
+    /// command line options.
+    void reset();
+
+    /// \brief Parse command line.
+    ///
+    /// Parses the command line and stores the selected options
+    /// in class data members.
+    ///
+    /// \param argc Argument count passed to main().
+    /// \param argv Argument value array passed to main().
+    /// \param print_cmd_line Print the command line being run to the console.
+    /// \throws isc::InvalidParameter if parse fails.
+    /// \return true if program has been run in help or version mode ('h' or 'v' flag).
+    bool parse(int argc, char** const argv, bool print_cmd_line = false);
+
+    /// \brief Returns IP version.
+    ///
+    /// \return IP version to be used.
+    uint8_t getIpVersion() const { return ipversion_; }
+
+    /// \brief Returns packet exchange mode.
+    ///
+    /// \return packet exchange mode.
+    ExchangeMode getExchangeMode() const { return exchange_mode_; }
+
+    /// \ brief Returns the type of lease being requested.
+    ///
+    /// \return type of lease being requested by perfdhcp.
+    LeaseType getLeaseType() const { return (lease_type_); }
+
+    /// \brief Returns exchange rate.
+    ///
+    /// \return exchange rate per second.
+    int getRate() const { return rate_; }
+
+    /// \brief Returns a rate at which DHCPv6 Renew messages are sent.
+    ///
+    /// \return A rate at which IPv6 Renew messages are sent.
+    int getRenewRate() const { return (renew_rate_); }
+
+    /// \brief Returns a rate at which DHCPv6 Release messages are sent.
+    ///
+    /// \return A rate at which DHCPv6 Release messages are sent.
+    int getReleaseRate() const { return (release_rate_); }
+
+    /// \brief Returns delay between two performance reports.
+    ///
+    /// \return delay between two consecutive performance reports.
+    int getReportDelay() const { return report_delay_; }
+
+    /// \brief Returns clean report mode.
+    ///
+    /// \return true if cleaner report is enabled.
+    int getCleanReport() const { return clean_report_; }
+
+    /// \brief Returns clean report separator.
+    ///
+    /// \return returns string which is used as separator for report..
+    std::string getCleanReportSeparator() const { return clean_report_separator_; }
+
+    /// \brief Returns number of simulated clients.
+    ///
+    /// \return number of simulated clients.
+    uint32_t getClientsNum() const { return clients_num_; }
+
+    /// \brief Returns MAC address template.
+    ///
+    /// \return MAC address template to simulate different clients.
+    std::vector<uint8_t> getMacTemplate() const { return mac_template_; }
+
+    /// \brief Returns DUID template.
+    ///
+    /// \return DUID template to simulate different clients.
+    std::vector<uint8_t> getDuidTemplate() const { return duid_template_; }
+
+    /// \brief Returns base values.
+    ///
+    /// \return all base values specified.
+    std::vector<std::string> getBase() const { return base_; }
+
+    /// \brief Returns address uniqueness value.
+    ///
+    /// \return address uniqueness specified value.
+    bool getAddrUnique() const { return addr_unique_; }
+
+    /// \brief Returns maximum number of exchanges.
+    ///
+    /// \return number of exchange requests before test is aborted.
+    std::vector<int> getNumRequests() const { return num_request_; }
+
+    /// \brief Returns test period.
+    ///
+    /// \return test period before it is aborted.
+    int getPeriod() const { return period_; }
+
+    /// \brief Returns time to wait for elapsed time increase.
+    ///
+    /// \return how long perfdhcp will wait before start sending
+    /// messages with increased elapsed time.
+    int getWaitForElapsedTime() const { return wait_for_elapsed_time_; }
+
+    /// \brief Returns increased elapsed time.
+    ///
+    /// \return how long perfdhcp will send messages with increased
+    /// elapsed time.
+    int getIncreaseElapsedTime() const { return increased_elapsed_time_; }
+
+    /// \brief Returns drop time.
+    ///
+    /// The method returns maximum time elapsed from
+    /// sending the packet before it is assumed dropped.
+    ///
+    /// \return return time before request is assumed dropped.
+    std::vector<double> getDropTime() const { return drop_time_; }
+
+    /// \brief Returns maximum drops number.
+    ///
+    /// Returns maximum number of packet drops before
+    /// aborting a test.
+    ///
+    /// \return maximum number of dropped requests.
+    std::vector<int> getMaxDrop() const { return max_drop_; }
+
+    /// \brief Returns maximal percentage of drops.
+    ///
+    /// Returns maximal percentage of packet drops
+    /// before aborting a test.
+    ///
+    /// \return maximum percentage of lost requests.
+    std::vector<double> getMaxDropPercentage() const { return max_pdrop_; }
+
+    /// \brief Returns local address or interface name.
+    ///
+    /// \return local address or interface name.
+    std::string getLocalName() const { return localname_; }
+
+    /// \brief Checks if interface name was used.
+    ///
+    /// The method checks if interface name was used
+    /// rather than address.
+    ///
+    /// \return true if interface name was used.
+    bool isInterface() const { return is_interface_; }
+
+    /// \brief Returns number of preload exchanges.
+    ///
+    /// \return number of preload exchanges.
+    int getPreload() const { return preload_; }
+
+    /// \brief Returns local port number.
+    ///
+    /// \return local port number.
+    int getLocalPort() const { return local_port_; }
+
+    /// \brief Returns remote port number.
+    ///
+    /// \return remote port number.
+    int getRemotePort() const { return remote_port_; }
+
+    /// @brief Returns the time in microseconds to delay the program by.
+    ///
+    /// @return the time in microseconds to delay the program by.
+    int getExitWaitTime() const { return exit_wait_time_; }
+
+    /// \brief Checks if seed provided.
+    ///
+    /// \return true if seed was provided.
+    bool isSeeded() const { return seeded_; }
+
+    /// \brief Returns random seed.
+    ///
+    /// \return random seed.
+    uint32_t getSeed() const { return seed_; }
+
+    /// \brief Checks if broadcast address is to be used.
+    ///
+    /// \return true if broadcast address is to be used.
+    bool isBroadcast() const { return broadcast_; }
+
+    /// \brief Check if rapid commit option used.
+    ///
+    /// \return true if rapid commit option is used.
+    bool isRapidCommit() const { return rapid_commit_; }
+
+    /// \brief Check if server-ID to be taken from first package.
+    ///
+    /// \return true if server-iD to be taken from first package.
+    bool isUseFirst() const { return use_first_; }
+
+    /// \brief Check if generated DHCPv6 messages should appear as relayed.
+    ///
+    /// \return true if generated traffic should appear as relayed.
+    bool isUseRelayedV6() const { return (v6_relay_encapsulation_level_ > 0); }
+
+    /// \brief Returns template file names.
+    ///
+    /// \return template file names.
+    std::vector<std::string> getTemplateFiles() const { return template_file_; }
+
+    /// \brief Returns location of the file containing list of MAC addresses.
+    ///
+    /// MAC addresses read from the file are used by the perfdhcp in message
+    /// exchanges with the DHCP server.
+    ///
+    /// \return Location of the file containing list of MAC addresses.
+    std::string getMacListFile() const { return mac_list_file_; }
+
+    /// \brief Returns reference to a vector of MAC addresses read from a file.
+    ///
+    /// Every MAC address is represented as a vector.
+    ///
+    /// \return Reference to a vector of vectors.
+    const MacAddrsVector& getMacsFromFile() const { return mac_list_; }
+
+    /// brief Returns template offsets for xid.
+    ///
+    /// \return template offsets for xid.
+    std::vector<int> getTransactionIdOffset() const { return xid_offset_; }
+
+    /// \brief Returns template offsets for rnd.
+    ///
+    /// \return template offsets for rnd.
+    std::vector<int> getRandomOffset() const { return rnd_offset_; }
+
+    /// \brief Returns template offset for elapsed time.
+    ///
+    /// \return template offset for elapsed time.
+    int getElapsedTimeOffset() const { return elp_offset_; }
+
+    /// \brief Returns template offset for server-ID.
+    ///
+    /// \return template offset for server-ID.
+    int getServerIdOffset() const { return sid_offset_; }
+
+    /// \brief Returns template offset for requested IP.
+    ///
+    /// \return template offset for requested IP.
+    int getRequestedIpOffset() const { return rip_offset_; }
+
+    /// \brief Returns diagnostic selectors.
+    ///
+    /// \return diagnostics selector.
+    std::string getDiags() const { return diags_; }
+
+    /// \brief Returns wrapped command.
+    ///
+    /// \return wrapped command (start/stop).
+    std::string getWrapped() const { return wrapped_; }
+
+    /// @brief Returns extra options to be inserted.
+    ///
+    /// @return container with options.
+    const isc::dhcp::OptionCollection& getExtraOpts() const { return extra_opts_; }
+
+    /// @brief Returns relay options to be inserted at given level of encapsulation.
+    ///
+    /// @param encapsulation_level level of encapsulation, by default 1
+    ///
+    /// @throws isc::OutOfRange When trying to access relay options at encapsulation
+    /// level that doesn't exist.
+    ///
+    /// @return container with options.
+    const isc::dhcp::OptionCollection& getRelayOpts(uint8_t encapsulation_level = 1) const;
+
+    /// \brief Check if single-threaded mode is enabled.
+    ///
+    /// \return true if single-threaded mode is enabled.
+    bool isSingleThreaded() const { return single_thread_mode_; }
+
+    /// \brief Returns selected scenario.
+    ///
+    /// \return enum Scenario.
+    Scenario getScenario() const { return scenario_; }
+
+    /// \brief Returns server name.
+    ///
+    /// \return server name.
+    std::string getServerName() const { return server_name_; }
+
+    /// \brief Returns file location with set of relay addresses.
+    ///
+    /// \return relay addresses list file location.
+    std::string getRelayAddrListFile() const { return relay_addr_list_file_; }
+
+    /// \brief Returns list of relay addresses.
+    ///
+    /// \return list of relay addresses.
+    std::vector<std::string> getRelayAddrList() const { return relay_addr_list_; }
+
+    /// \brief Returns random relay address.
+    ///
+    /// \return single string containing relay address.
+    std::string getRandRelayAddr() { return relay_addr_list_[rand() % relay_addr_list_.size()]; }
+
+    /// \brief Check if multi subnet mode is enabled.
+    ///
+    /// \return true if multi subnet mode is enabled.
+    bool checkMultiSubnet() { return multi_subnet_; }
+
+    /// \brief Find if diagnostic flag has been set.
+    ///
+    /// \param diag diagnostic flag (a,e,i,s,r,t,T).
+    /// \return true if diagnostics flag has been set.
+    bool testDiags(const char diag) {
+        if (getDiags().find(diag) != std::string::npos) {
+            return (true);
+        }
+        return (false);
+    }
+
+    /// \brief Print command line arguments.
+    void printCommandLine() const;
+
+    /// \brief Print usage.
+    ///
+    /// Prints perfdhcp usage.
+    static void usage();
+
+    /// \brief Print program version.
+    ///
+    /// Prints perfdhcp version.
+    void version() const;
+
+private:
+    /// \brief Initializes class members based on the command line.
+    ///
+    /// Reads each command line parameter and sets class member values.
+    ///
+    /// \param argc Argument count passed to main().
+    /// \param argv Argument value array passed to main().
+    /// \param print_cmd_line Print the command line being run to the console.
+    /// \throws isc::InvalidParameter if command line options initialization fails.
+    /// \return true if program has been run in help or version mode ('h' or 'v' flag).
+    bool initialize(int argc, char** argv, bool print_cmd_line);
+
+    /// \brief Validates initialized options.
+    ///
+    /// It checks provided options. If there are issues they are reported
+    /// and exception is raised. If possible some options are corrected
+    /// e.g. overriding drop_time in case of avalanche scenario.
+    /// \throws isc::InvalidParameter if command line validation fails.
+    void validate();
+
+    /// \brief Throws !InvalidParameter exception if condition is true.
+    ///
+    /// Convenience function that throws an InvalidParameter exception if
+    /// the condition argument is true.
+    ///
+    /// \param condition Condition to be checked.
+    /// \param errmsg Error message in exception.
+    /// \throws isc::InvalidParameter if condition argument true.
+    inline void check(bool condition, const std::string& errmsg) const;
+
+    /// \brief Casts command line argument to positive integer.
+    ///
+    /// \param errmsg Error message if lexical cast fails.
+    /// \throw InvalidParameter if lexical cast fails.
+    int positiveInteger(const std::string& errmsg) const;
+
+    /// \brief Casts command line argument to non-negative integer.
+    ///
+    /// \param errmsg Error message if lexical cast fails.
+    /// \throw InvalidParameter if lexical cast fails.
+    int nonNegativeInteger(const std::string& errmsg) const;
+
+    /// \brief Returns command line string if it is not empty.
+    ///
+    /// \param errmsg Error message if string is empty.
+    /// \throw InvalidParameter if string is empty.
+    std::string nonEmptyString(const std::string& errmsg) const;
+
+    /// \brief Decodes the lease type requested by perfdhcp from optarg.
+    ///
+    /// \throw InvalidParameter if lease type value specified is invalid.
+    void initLeaseType();
+
+    /// \brief Set number of clients.
+    ///
+    /// Interprets the getopt() "opt" global variable as the number of clients
+    /// (a non-negative number).  This value is specified by the "-R" switch.
+    ///
+    /// \throw InvalidParameter if -R<value> is wrong.
+    void initClientsNum();
+
+    /// \brief Sets value indicating if interface name was given.
+    ///
+    /// Method checks if the command line argument given with
+    /// '-l' option is the interface name. The is_interface_ member
+    /// is set accordingly.
+    void initIsInterface();
+
+    /// \brief Decodes base provided with -b<base>.
+    ///
+    /// Function decodes argument of -b switch, which
+    /// specifies a base value used to generate unique
+    /// mac or duid values in packets sent to system
+    /// under test.
+    /// The following forms of switch arguments are supported:
+    /// - -b mac=00:01:02:03:04:05
+    /// - -b duid=0F1234 (duid can be up to 128 hex digits)
+    //  Function will decode 00:01:02:03:04:05 and/or
+    /// 0F1234 respectively and initialize mac_template_
+    /// and/or duid_template_ members.
+    ///
+    /// \param base Base in string format.
+    /// \throws isc::InvalidParameter if base is invalid.
+    void decodeBase(const std::string& base);
+
+    /// \brief Decodes base MAC address provided with -b<base>.
+    ///
+    /// Function decodes parameter given as -b mac=00:01:02:03:04:05
+    /// The function will decode 00:01:02:03:04:05 initialize mac_template_
+    /// class member.
+    /// Provided MAC address is for example only.
+    ///
+    /// \param base Base string given as -b mac=00:01:02:03:04:05.
+    /// \throws isc::InvalidParameter if mac address is invalid.
+    void decodeMacBase(const std::string& base);
+
+    /// \brief Decodes base DUID provided with -b<base>.
+    ///
+    /// Function decodes parameter given as -b duid=0F1234.
+    /// The function will decode 0F1234 and initialize duid_template_
+    /// class member.
+    /// Provided DUID is for example only.
+    ///
+    /// \param base Base string given as -b duid=0F1234.
+    /// \throws isc::InvalidParameter if DUID is invalid.
+    void decodeDuid(const std::string& base);
+
+    /// \brief Generates DUID-LLT (based on link layer address).
+    ///
+    /// Function generates DUID based on link layer address and
+    /// initiates duid_template_ value with it.
+    /// \todo add support to generate DUIDs other than based on
+    /// 6-octets long MACs (e.g. DUID-UUID.
+    void generateDuidTemplate();
+
+    /// \brief Converts two-digit hexadecimal string to a byte.
+    ///
+    /// \param hex_text Hexadecimal string e.g. AF.
+    /// \throw isc::InvalidParameter if string does not represent hex byte.
+    uint8_t convertHexString(const std::string& hex_text) const;
+
+    /// \brief Opens the text file containing list of macs (one per line)
+    /// and adds them to the mac_list_ vector.
+    void loadMacs();
+
+    /// \brief Decodes a mac string into a vector of uint8_t and adds it to the
+    /// mac_list_ vector.
+    bool decodeMacString(const std::string& line);
+
+    /// \brief Opens the text file containing list of addresses (one per line).
+    void loadRelayAddr();
+
+    /// \brief Checks if loaded relay addresses from text file are correct,
+    /// adds them to relay_addr_list_.
+    ///
+    /// \return true if address is incorrect.
+    bool validateIP(const std::string& line);
+
+    /// IP protocol version to be used, expected values are:
+    /// 4 for IPv4 and 6 for IPv6, default value 0 means "not set".
+    uint8_t ipversion_;
+
+    /// Packet exchange mode (e.g. DORA/SARR).
+    ExchangeMode exchange_mode_;
+
+    /// Lease Type to be obtained: address only, IPv6 prefix only.
+    LeaseType lease_type_;
+
+    /// Rate in exchange per second.
+    unsigned int rate_;
+
+    /// A rate at which DHCPv6 Renew messages are sent.
+    unsigned int renew_rate_;
+
+    /// A rate at which DHCPv6 Release messages are sent.
+    unsigned int release_rate_;
+
+    /// Delay between generation of two consecutive performance reports.
+    int report_delay_;
+
+    /// Enable cleaner, easy to parse, output of performance reports.
+    bool clean_report_;
+
+    /// If clean report is enabled separator for output can be configured.
+    std::string clean_report_separator_;
+
+    /// Number of simulated clients (aka randomization range).
+    uint32_t clients_num_;
+
+    /// MAC address template used to generate unique MAC
+    /// addresses for simulated clients.
+    std::vector<uint8_t> mac_template_;
+
+    /// DUID template used to generate unique DUIDs for
+    /// simulated clients.
+    std::vector<uint8_t> duid_template_;
+
+    /// Check address uniqueness.
+    bool addr_unique_;
+
+    /// Collection of base values specified with -b<value>
+    /// options. Supported "bases" are mac=<mac> and duid=<duid>.
+    std::vector<std::string> base_;
+
+    /// Number of microseconds by which you should delay the exit.
+    int exit_wait_time_;
+
+    /// Number of 2 or 4-way exchanges to perform.
+    std::vector<int> num_request_;
+
+    /// Test period in seconds.
+    int period_;
+
+    // for how long perfdhcp will wait before start sending
+    // messages with increased elapsed time.
+    int wait_for_elapsed_time_;
+
+    // Amount of time after which perfdhcp will send messages with
+    // elapsed time increased.
+    int increased_elapsed_time_;
+
+    /// Indicates number of -d<value> parameters specified by user.
+    /// If this value goes above 2, command line parsing fails.
+    uint8_t drop_time_set_;
+
+    /// Time to elapse before request is lost. The first value of
+    /// two-element vector refers to DO/SA exchanges,
+    /// second value refers to RA/RR. Default values are { 1, 1 }.
+    std::vector<double> drop_time_;
+
+    /// Maximum number of drops request before aborting test.
+    /// First value of two-element vector specifies maximum
+    /// number of drops for DO/SA exchange, second value
+    /// specifies maximum number of drops for RA/RR.
+    std::vector<int> max_drop_;
+
+    /// Maximal percentage of lost requests before aborting test.
+    /// First value of two-element vector specifies percentage for
+    /// DO/SA exchanges, second value for RA/RR.
+    std::vector<double> max_pdrop_;
+
+    /// Local address or interface specified with -l<value> option.
+    std::string localname_;
+
+    /// Indicates that specified value with -l<value> is
+    /// rather interface (not address).
+    bool is_interface_;
+
+    /// Number of preload packets. Preload packets are used to
+    /// initiate communication with server before doing performance
+    /// measurements.
+    int preload_;
+
+    /// Local port number (host endian).
+    int local_port_;
+
+    /// Remote port number (host endian).
+    int remote_port_;
+
+    /// Randomization seed.
+    uint32_t seed_;
+
+    /// Indicates that randomization seed was provided.
+    bool seeded_;
+
+    /// Indicates that we use broadcast address.
+    bool broadcast_;
+
+    /// Indicates that we do rapid commit option.
+    bool rapid_commit_;
+
+    /// Indicates that we take server id from first received packet.
+    bool use_first_;
+
+    /// Packet template file names. These files store template packets
+    /// that are used for initiating exchanges. Template packets
+    /// read from files are later tuned with variable data.
+    std::vector<std::string> template_file_;
+
+    /// Location of a file containing a list of MAC addresses, one per line.
+    /// This can be used if you don't want to generate MAC address from a
+    /// base MAC address, but rather provide the file with a list of MAC
+    /// addresses to be randomly picked. Note that in DHCPv6 those MAC
+    /// addresses will be used to generate DUID-LL.
+    std::string mac_list_file_;
+
+    /// List of MAC addresses loaded from a file.
+    std::vector<std::vector<uint8_t> > mac_list_;
+
+    /// Location of a file containing a list of subnet addresses, one per line.
+    std::string relay_addr_list_file_;
+
+    /// List of validated subnet addresses.
+    std::vector<std::string> relay_addr_list_;
+
+    /// Flag to indicate multiple subnets testing.
+    bool multi_subnet_;
+
+    /// Offset of transaction id in template files. First vector
+    /// element points to offset for DISCOVER/SOLICIT messages,
+    /// second element points to transaction id offset for
+    /// REQUEST messages.
+    std::vector<int> xid_offset_;
+
+    /// Random value offset in templates. Random value offset
+    /// points to last octet of DUID. Up to 4 last octets of
+    /// DUID are randomized to simulate different clients.
+    std::vector<int> rnd_offset_;
+
+    /// Offset of elapsed time option in template packet.
+    int elp_offset_;
+
+    /// Offset of server id option in template packet.
+    int sid_offset_;
+
+    /// Offset of requested ip data in template packet.
+    int rip_offset_;
+
+    /// String representing diagnostic selectors specified
+    /// by user with -x<value>.
+    std::string diags_;
+
+    /// Command to be executed at the beginning/end of the test.
+    /// This command is expected to expose start and stop argument.
+    std::string wrapped_;
+
+    /// Server name specified as last argument of command line.
+    std::string server_name_;
+
+    /// Indicates how many DHCPv6 relay agents are simulated.
+    uint8_t v6_relay_encapsulation_level_;
+
+    /// @brief Extra options to be sent in each packet.
+    isc::dhcp::OptionCollection extra_opts_;
+
+    /// @brief Map of relay options to be sent per encapsulation level.
+    std::map<uint8_t, isc::dhcp::OptionCollection> relay_opts_;
+
+    /// @brief Option to switch modes between single-threaded and multi-threaded.
+    bool single_thread_mode_;
+
+    /// @brief Selected performance scenario. Default is basic.
+    Scenario scenario_;
+};
+
+}  // namespace perfdhcp
+}  // namespace isc
+
+#endif // COMMAND_OPTIONS_H
diff --git a/src/bin/perfdhcp/localized_option.h b/src/bin/perfdhcp/localized_option.h
new file mode 100644
index 0000000..289ff7d
--- /dev/null
+++ b/src/bin/perfdhcp/localized_option.h
@@ -0,0 +1,142 @@
+// Copyright (C) 2012-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef LOCALIZED_OPTION_H
+#define LOCALIZED_OPTION_H
+
+#include <dhcp/pkt6.h>
+#include <dhcp/option6_ia.h>
+#include <util/buffer.h>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief DHCP option at specific offset
+///
+/// This class represents DHCP option with data placed at specified
+/// offset in DHCP message.
+/// Objects of this type are intended to be used when DHCP packets
+/// are created from templates (e.g. read from template file).
+/// Such packets have number of options with contents that have to be
+/// replaced before sending: e.g. DUID can be randomized.
+/// If option of this type is added to \ref PerfPkt6 options collection,
+/// \ref perfdhcp::PerfPkt6 will call \ref getOffset on this object
+/// to retrieve user-defined option position and replace contents of
+/// the output buffer at this offset before packet is sent to the server.
+/// (\see perfdhcp::PerfPkt6::rawPack).
+/// In order to read on-wire data from incoming packet client class
+/// has to specify options of \ref perfdhcp::LocalizedOption type
+/// with expected offsets of these options in a packet. The
+/// \ref perfdhcp::PerfPkt6 will use offsets to read fragments
+/// of packet and store them in options' buffers.
+/// (\see perfdhcp::PerfPkt6::rawUnpack).
+///
+class LocalizedOption : public dhcp::Option {
+public:
+
+    /// \brief Constructor, used to create localized option from buffer.
+    ///
+    /// This constructor creates localized option using whole provided
+    /// option buffer.
+    ///
+    /// \param u universe (V4 or V6).
+    /// \param type option type (0-255 for V4 and 0-65535 for V6).
+    /// Option values 0 and 255 (v4) and 0 (v6) are not valid option
+    /// codes but they are accepted here for the server testing purposes.
+    /// \param data content of the option.
+    /// \param offset location of option in a packet (zero is default).
+    LocalizedOption(dhcp::Option::Universe u,
+                    uint16_t type,
+                    const dhcp::OptionBuffer& data,
+                    const size_t offset = 0) :
+        dhcp::Option(u, type, data),
+        offset_(offset), option_valid_(true) {
+    }
+
+    /// \brief Constructor, used to create option from buffer iterators.
+    ///
+    /// This constructor creates localized option using part of the
+    /// option buffer pointed by iterators.
+    ///
+    /// \param u specifies universe (V4 or V6)
+    /// \param type option type (0-255 for V4 and 0-65535 for V6)
+    /// \param first iterator to the first element that should be copied
+    /// \param last iterator to the next element after the last one
+    ///        to be copied.
+    /// \param offset offset of option in a packet (zero is default)
+    LocalizedOption(dhcp::Option::Universe u,
+                    uint16_t type,
+                    dhcp::OptionBufferConstIter first,
+                    dhcp::OptionBufferConstIter last,
+                    const size_t offset = 0) :
+        dhcp::Option(u, type, first, last),
+        offset_(offset), option_valid_(true) {
+    }
+
+    /// \brief Copy constructor, creates LocalizedOption from Option6IA.
+    ///
+    /// This copy constructor creates regular option from Option6IA.
+    /// The data from Option6IA data members are copied to
+    /// option buffer in appropriate sequence.
+    ///
+    /// \param opt_ia option to be copied.
+    /// \param offset location of the option in a packet.
+    LocalizedOption(const boost::shared_ptr<dhcp::Option6IA>& opt_ia,
+                    const size_t offset) :
+        dhcp::Option(Option::V6, 0, dhcp::OptionBuffer()),
+        offset_(offset), option_valid_(false) {
+        // If given option is NULL we will mark this new option
+        // as invalid. User may query if option is valid when
+        // object is created.
+        if (opt_ia) {
+            // Set universe and type.
+            universe_ = opt_ia->getUniverse();
+            type_ = opt_ia->getType();
+            util::OutputBuffer buf(opt_ia->len() - opt_ia->getHeaderLen());
+            try {
+                // Try to pack option data into the temporary buffer.
+                opt_ia->pack(buf);
+                if (buf.getLength() > 0) {
+                    const char* buf_data = static_cast<const char*>(buf.getData());
+                    // Option has been packed along with option type flag
+                    // and transaction id so we have to skip first 4 bytes
+                    // when copying temporary buffer option buffer.
+                    data_.assign(buf_data + 4, buf_data + buf.getLength());
+                }
+                option_valid_ = true;
+            } catch (const Exception&) {
+                // If there was an exception somewhere when packing
+                // the data into the buffer we assume that option is
+                // not valid and should not be used.
+                option_valid_ = false;
+            }
+        } else {
+            option_valid_ = false;
+        }
+    }
+
+    /// \brief Returns offset of an option in a DHCP packet.
+    ///
+    /// \return option offset in a packet
+    size_t getOffset() const { return offset_; };
+
+    /// \brief Checks if option is valid.
+    ///
+    /// \return true, if option is valid.
+    virtual bool valid() const {
+        return (Option::valid() && option_valid_);
+    }
+
+private:
+    size_t offset_;   ///< Offset of DHCP option in a packet
+    bool option_valid_; ///< Is option valid.
+};
+
+
+} // namespace isc::perfdhcp
+} // namespace isc
+
+#endif // LOCALIZED_OPTION_H
diff --git a/src/bin/perfdhcp/main.cc b/src/bin/perfdhcp/main.cc
new file mode 100644
index 0000000..5262ace
--- /dev/null
+++ b/src/bin/perfdhcp/main.cc
@@ -0,0 +1,76 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/avalanche_scen.h>
+#include <perfdhcp/basic_scen.h>
+#include <perfdhcp/command_options.h>
+
+#include <exceptions/exceptions.h>
+
+#include <iostream>
+#include <stdint.h>
+
+using namespace isc::perfdhcp;
+
+int
+main(int argc, char* argv[]) {
+    int ret_code = 0;
+    std::string diags;
+    bool parser_error = true;
+    try {
+        CommandOptions command_options;
+        diags = command_options.getDiags();
+        // If parser returns true it means that user specified
+        // 'h' or 'v' command line option. Program shows the
+        // help or version message and exits here.
+        // The third argument indicates that the command line
+        // should be printed when it gets parsed. This is useful
+        // in particular when the command line needs to be
+        // extracted from the log file.
+        if (command_options.parse(argc, argv, true)) {
+            return (ret_code);
+        }
+        parser_error = false;
+        auto scenario = command_options.getScenario();
+        PerfSocket socket(command_options);
+        if (scenario == Scenario::BASIC) {
+            BasicScen scen(command_options, socket);
+            ret_code = scen.run();
+        } else if (scenario == Scenario::AVALANCHE) {
+            AvalancheScen scen(command_options, socket);
+            ret_code = scen.run();
+        }
+    } catch (const std::exception& e) {
+        ret_code = 1;
+        if (!parser_error) {
+            std::cerr << std::endl << "ERROR: running perfdhcp: "
+                      << e.what() << std::endl;
+        } else {
+            CommandOptions::usage();
+            std::cerr << std::endl << "ERROR: parsing command line options: "
+                      << e.what() << std::endl;
+        }
+        if (diags.find('e') != std::string::npos) {
+            std::cerr << "Fatal error" << std::endl;
+        }
+    } catch (...) {
+        ret_code = 1;
+        if (!parser_error) {
+            std::cerr << std::endl << "ERROR: running perfdhcp"
+                      << std::endl;
+        } else {
+            CommandOptions::usage();
+            std::cerr << std::endl << "ERROR: parsing command line options"
+                      << std::endl;
+        }
+        if (diags.find('e') != std::string::npos) {
+            std::cerr << "Fatal error" << std::endl;
+        }
+    }
+    return (ret_code);
+}
diff --git a/src/bin/perfdhcp/packet_storage.h b/src/bin/perfdhcp/packet_storage.h
new file mode 100644
index 0000000..3908d77
--- /dev/null
+++ b/src/bin/perfdhcp/packet_storage.h
@@ -0,0 +1,153 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PACKET_STORAGE_H
+#define PACKET_STORAGE_H
+
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <list>
+#include <stdint.h>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief Represents a list of packets with a sequential and random access to
+/// list elements.
+///
+/// The main purpose of this class is to support sending Renew and Release
+/// messages from perfdhcp. The Renew and Release messages are sent for existing
+/// leases only. Therefore, the typical use case for this class is that it holds
+/// a list of Reply messages sent by the server in response to Request messages.
+/// The Request messages hold addresses and/or IPv6 prefixes acquired so they
+/// can be used to identify existing leases. When perfdhcp needs to send Renew
+/// or Release message, it will access one of the elements on this list and
+/// will create the Renew or Release message based on its content. Once the
+/// element (packet) is returned it is also deleted from the list, so as it is
+/// not used again. This class provide either sequential access to the packets
+/// or random access. The random access algorithm is much slower but at least
+/// it allows to simulate more real scenario when the renewing or releasing
+/// client is random.
+///
+/// \tparam Pkt4 or Pkt6 class, which represents DHCPv4 or DHCPv6 message
+/// respectively.
+///
+/// \note Although the class is intended to hold Pkt4 and Pkt6 objects, the
+/// current implementation is generic enough to holds any object wrapped in the
+/// boost::shared_ptr.
+template<typename T>
+class PacketStorage : public boost::noncopyable {
+public:
+    /// A type which represents the pointer to a packet.
+    typedef boost::shared_ptr<T> PacketPtr;
+
+private:
+    /// An internal container actually holding packets.
+    typedef typename std::list<PacketPtr> PacketContainer;
+    /// An iterator to the element in the internal container.
+    typedef typename PacketContainer::iterator PacketContainerIterator;
+
+public:
+
+    /// \brief Constructor.
+    PacketStorage() { }
+
+    /// \brief Appends the new packet object to the collection.
+    ///
+    /// \param packet A pointer to an object representing a packet.
+    void append(const PacketPtr& packet) {
+        storage_.push_back(packet);
+        if (storage_.size() == 1) {
+            current_pointer_ = storage_.begin();
+        }
+    }
+
+    /// \brief Removes packets from the storage.
+    ///
+    /// It is possible to specify a number of packets to be removed
+    /// from a storage. Packets are removed from the beginning of the
+    /// storage. If specified number is greater than the size of the
+    /// storage, all packets are removed.
+    ///
+    /// @param num A number of packets to be removed. If omitted,
+    /// all packets will be removed.
+    void clear(const uint64_t num = 0) {
+        if (num != 0) {
+            PacketContainerIterator last = storage_.begin();
+            std::advance(last, num > size() ? size() : num);
+            current_pointer_ = storage_.erase(storage_.begin(), last);
+        } else {
+            storage_.clear();
+            current_pointer_ = storage_.begin();
+        }
+    }
+
+    /// \brief Checks if the storage has no packets.
+    ///
+    /// \return true if storage is empty, false otherwise.
+    bool empty() const {
+        return (storage_.empty());
+    }
+
+    /// \brief Returns next packet from the storage.
+    ///
+    /// This function returns packets sequentially (in the same order
+    /// in which they have been appended). The returned packet is
+    /// instantly removed from the storage.
+    ///
+    /// \return next packet from the storage.
+    PacketPtr getNext() {
+        if (storage_.empty()) {
+            return (PacketPtr());
+        } else if (current_pointer_ == storage_.end()) {
+            current_pointer_ = storage_.begin();
+        }
+        PacketPtr packet = *current_pointer_;
+        current_pointer_ = storage_.erase(current_pointer_);
+        return (packet);
+    }
+
+    /// \brief Returns random packet from the storage.
+    ///
+    /// This function picks random packet from the storage and returns
+    /// it. It is way slower than the @c getNext function because it has to
+    /// iterate over all existing entries from the beginning of the storage
+    /// to the random packet's position. Therefore, care should be taken
+    /// when using this function to access elements when storage is large.
+    ///
+    /// \return random packet from the storage.
+    PacketPtr getRandom() {
+        if (empty()) {
+            return (PacketPtr());
+        }
+        current_pointer_ = storage_.begin();
+        if (size() > 1) {
+            std::advance(current_pointer_, rand() % (size() - 1));
+        }
+        PacketPtr packet = *current_pointer_;
+        current_pointer_ = storage_.erase(current_pointer_);
+        return (packet);
+    }
+
+    /// \brief Returns number of packets in the storage.
+    ///
+    /// \return number of packets in the storage.
+    uint64_t size() const {
+        return (storage_.size());
+    }
+
+private:
+
+    std::list<PacketPtr> storage_;            ///< Holds all appended packets.
+    PacketContainerIterator current_pointer_; ///< Holds the iterator to the
+                                              ///< next element returned.
+
+};
+
+} // namespace perfdhcp
+} // namespace isc
+
+#endif // PACKET_STORAGE_H
diff --git a/src/bin/perfdhcp/perf_pkt4.cc b/src/bin/perfdhcp/perf_pkt4.cc
new file mode 100644
index 0000000..742c8f3
--- /dev/null
+++ b/src/bin/perfdhcp/perf_pkt4.cc
@@ -0,0 +1,64 @@
+// Copyright (C) 2012-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/perf_pkt4.h>
+
+#include <dhcp/libdhcp++.h>
+#include <dhcp/dhcp4.h>
+
+using namespace std;
+using namespace isc;
+using namespace dhcp;
+
+namespace isc {
+namespace perfdhcp {
+
+PerfPkt4::PerfPkt4(const uint8_t* buf,
+                   size_t len,
+                   size_t transid_offset,
+                   uint32_t transid) :
+    Pkt4(buf, len),
+    transid_offset_(transid_offset) {
+    setTransid(transid);
+}
+
+bool
+PerfPkt4::rawPack() {
+    return (PktTransform::pack(dhcp::Option::V4,
+                               data_,
+                               options_,
+                               getTransidOffset(),
+                               getTransid(),
+                               buffer_out_));
+}
+
+bool
+PerfPkt4::rawUnpack() {
+    uint32_t transid = getTransid();
+    bool res = PktTransform::unpack(dhcp::Option::V4,
+                                    data_,
+                                    options_,
+                                    getTransidOffset(),
+                                    transid);
+    if (res) {
+        setTransid(transid);
+    }
+    return (res);
+}
+
+void
+PerfPkt4::writeAt(size_t dest_pos,
+                  std::vector<uint8_t>::iterator first,
+                  std::vector<uint8_t>::iterator last) {
+    return (PktTransform::writeAt(data_, dest_pos, first, last));
+}
+
+
+
+} // namespace perfdhcp
+} // namespace isc
diff --git a/src/bin/perfdhcp/perf_pkt4.h b/src/bin/perfdhcp/perf_pkt4.h
new file mode 100644
index 0000000..d00a2b1
--- /dev/null
+++ b/src/bin/perfdhcp/perf_pkt4.h
@@ -0,0 +1,133 @@
+// Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PERF_PKT4_H
+#define PERF_PKT4_H
+
+#include <perfdhcp/localized_option.h>
+#include <perfdhcp/pkt_transform.h>
+
+#include <dhcp/pkt4.h>
+
+#include <boost/shared_ptr.hpp>
+#include <time.h>
+
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief PerfPkt4 (DHCPv4 packet)
+///
+/// This class extends the functionality of \ref isc::dhcp::Pkt4 by adding the
+/// ability to specify an options offset in the DHCP message and to override
+/// options' contents.  This is particularly useful when we create a packet
+/// object using a template file (i.e. do not build it dynamically). The client
+/// class should read data from the template file and pass it to this class in
+/// a buffer.
+///
+/// The contents of such a packet can be later partially replaced, notably the
+/// selected options and the transaction ID.  (The transaction ID and its
+/// offset in the template file are passed via the constructor.)
+///
+/// In order to replace contents of the options, the client class has to
+/// create a collection of \ref LocalizedOption, adding them using
+/// \ref dhcp::Pkt4::addOption.
+///
+/// \note If you don't use template files simply use constructors
+/// inherited from parent class and isc::dhcp::Option type instead
+
+class PerfPkt4 : public dhcp::Pkt4 {
+public:
+
+    /// Localized option pointer type.
+    typedef boost::shared_ptr<LocalizedOption> LocalizedOptionPtr;
+
+    /// \brief Constructor, used to create  messages from packet
+    /// template files.
+    ///
+    /// Creates a new DHCPv4 message using the provided buffer.
+    /// The transaction ID and its offset are specified via this
+    /// constructor. The transaction ID is stored in outgoing message
+    /// when client class calls \ref PerfPkt4::rawPack. Transaction id
+    /// offset value is used for incoming and outgoing messages to
+    /// identify transaction ID field's position in incoming and outgoing
+    /// messages.
+    ///
+    /// \param buf buffer holding contents of the message (this can
+    /// be directly read from template file).
+    /// \param len length of the data in the buffer.
+    /// \param transid_offset transaction id offset in a message.
+    /// \param transid transaction id to be stored in outgoing message.
+    PerfPkt4(const uint8_t* buf,
+             size_t len,
+             size_t transid_offset = 1,
+             uint32_t transid = 0);
+
+    /// \brief Returns transaction id offset in packet buffer
+    ///
+    /// \return Transaction ID offset in packet buffer
+    size_t getTransidOffset() const { return transid_offset_; };
+
+    /// \brief Prepares on-wire format from raw buffer.
+    ///
+    /// The method copies the buffer provided in the constructor to the
+    /// output buffer and replaces the transaction ID and selected
+    /// options with new data.
+    ///
+    /// \note Use this method to prepare an on-wire DHCPv4 message
+    /// when you use template packets that require replacement
+    /// of selected options' contents before sending.
+    ///
+    /// \return false ID pack operation failed.
+    bool rawPack();
+
+    /// \brief Handles limited binary packet parsing for packets with
+    /// custom offsets of options and transaction ID
+    ///
+    /// This method handles the parsing of packets that have custom offsets
+    /// of options or transaction ID. Use
+    /// \ref isc::dhcp::Pkt4::addOption to specify which options to parse.
+    /// Options should be of the \ref isc::perfdhcp::LocalizedOption
+    /// type with offset values provided. Each added option will
+    /// be updated with actual data read from the binary packet buffer.
+    ///
+    /// \return false If unpack operation failed.
+    bool rawUnpack();
+
+    /// \brief Replace contents of buffer with data.
+    ///
+    /// Function replaces part of the buffer with data from vector.
+    ///
+    /// \param dest_pos position in buffer where data is replaced.
+    /// \param first beginning of data range in source vector.
+    /// \param last end of data range in source vector.
+    void writeAt(size_t dest_pos,
+                 std::vector<uint8_t>::iterator first,
+                 std::vector<uint8_t>::iterator last);
+
+    /// \brief Replace contents of buffer with value.
+    ///
+    /// Function replaces part of buffer with value.
+    ///
+    /// \param dest_pos position in buffer where value is
+    /// to be written.
+    /// \param val value to be written.
+    template<typename T>
+    void writeValueAt(size_t dest_pos, T val) {
+        PktTransform::writeValueAt<T>(data_, dest_pos, val);
+    }
+
+private:
+    size_t transid_offset_;      ///< transaction id offset
+
+};
+
+typedef boost::shared_ptr<PerfPkt4> PerfPkt4Ptr;
+
+} // namespace perfdhcp
+} // namespace isc
+
+#endif // PERF_PKT4_H
diff --git a/src/bin/perfdhcp/perf_pkt6.cc b/src/bin/perfdhcp/perf_pkt6.cc
new file mode 100644
index 0000000..8f5e445
--- /dev/null
+++ b/src/bin/perfdhcp/perf_pkt6.cc
@@ -0,0 +1,67 @@
+// Copyright (C) 2011-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/perf_pkt6.h>
+#include <perfdhcp/pkt_transform.h>
+
+#include <exceptions/exceptions.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/dhcp6.h>
+
+#include <iostream>
+
+using namespace std;
+using namespace isc;
+using namespace dhcp;
+
+namespace isc {
+namespace perfdhcp {
+
+PerfPkt6::PerfPkt6(const uint8_t* buf,
+                   size_t len,
+                   size_t transid_offset,
+                   uint32_t transid) :
+    Pkt6(buf, len, Pkt6::UDP),
+    transid_offset_(transid_offset) {
+    setTransid(transid);
+}
+
+bool
+PerfPkt6::rawPack() {
+    return (PktTransform::pack(dhcp::Option::V6,
+                               data_,
+                               options_,
+                               getTransidOffset(),
+                               getTransid(),
+                               buffer_out_));
+}
+
+bool
+PerfPkt6::rawUnpack() {
+    uint32_t transid = getTransid();
+    bool res =  PktTransform::unpack(dhcp::Option::V6,
+                                     data_,
+                                     options_,
+                                     getTransidOffset(),
+                                     transid);
+    if (res) {
+        setTransid(transid);
+    }
+    return (res);
+}
+
+void
+PerfPkt6::writeAt(size_t dest_pos,
+                     std::vector<uint8_t>::iterator first,
+                     std::vector<uint8_t>::iterator last) {
+    return (PktTransform::writeAt(data_, dest_pos, first, last));
+}
+
+
+} // namespace perfdhcp
+} // namespace isc
diff --git a/src/bin/perfdhcp/perf_pkt6.h b/src/bin/perfdhcp/perf_pkt6.h
new file mode 100644
index 0000000..9181ceb
--- /dev/null
+++ b/src/bin/perfdhcp/perf_pkt6.h
@@ -0,0 +1,132 @@
+// Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PERF_PKT6_H
+#define PERF_PKT6_H
+
+#include <perfdhcp/localized_option.h>
+#include <perfdhcp/pkt_transform.h>
+
+#include <dhcp/pkt6.h>
+
+#include <time.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief PerfPkt6 (DHCPv6 packet)
+///
+/// This class extends the functionality of \ref isc::dhcp::Pkt6 by
+/// adding the ability to specify an options offset in the DHCP message
+/// and so override the options' contents. This is particularly useful when we
+/// create a packet object using a template file (i.e. do not build it
+/// dynamically). The client class should read the data from the template file
+/// and pass it to this class as a buffer.
+///
+/// The contents of such packet can be later partially replaced: in particular,
+/// selected options and the transaction ID can be altered. (The transaction
+/// ID and its offset in the template file is passed via the constructor.)
+///
+/// In order to replace the contents of options, the client class has to
+/// create a collection of \ref LocalizedOption by adding them using
+/// \ref dhcp::Pkt6::addOption.
+///
+/// \note If you don't use template files, simply use constructors
+/// inherited from parent class and the \ref isc::dhcp::Option type instead.
+
+class PerfPkt6 : public dhcp::Pkt6 {
+public:
+
+    /// Localized option pointer type.
+    typedef boost::shared_ptr<LocalizedOption> LocalizedOptionPtr;
+
+    /// \brief Constructor, used to create messages from packet
+    /// template files.
+    ///
+    /// Creates a new DHCPv6 message using the provided buffer.
+    /// The transaction ID and its offset are specified via this
+    /// constructor. The transaction ID is stored in outgoing message
+    /// when client class calls \ref PerfPkt6::rawPack. Transaction id
+    /// offset value is used for incoming and outgoing messages to
+    /// identify transaction ID field's position in incoming and outgoing
+    /// messages.
+    ///
+    /// \param buf buffer holding contents of the message (this can
+    /// be directly read from template file).
+    /// \param len length of the data in the buffer.
+    /// \param transid_offset transaction id offset in a message.
+    /// \param transid transaction id to be stored in outgoing message.
+    PerfPkt6(const uint8_t* buf,
+             size_t len,
+             size_t transid_offset = 1,
+             uint32_t transid = 0);
+
+    /// \brief Returns transaction id offset in packet buffer
+    ///
+    /// \return Transaction ID offset in the packet buffer.
+    size_t getTransidOffset() const { return transid_offset_; };
+
+    /// \brief Prepares on-wire format from raw buffer
+    ///
+    /// The method copies the buffer provided in constructor to the
+    /// output buffer and replaces the transaction ID and selected
+    /// options with new data.
+    ///
+    /// \note Use this method to prepare an on-wire DHCPv6 message
+    /// when you use template packets that require replacement
+    /// of selected options' contents before sending.
+    ///
+    /// \return false ID pack operation failed.
+    bool rawPack();
+
+    /// \brief Handles limited binary packet parsing for packets with
+    /// custom offsets of options and transaction id
+    ///
+    /// This method handles the parsing of packets that have custom offsets
+    /// of options or transaction ID. Use
+    /// \ref isc::dhcp::Pkt4::addOption to specify which options to parse.
+    /// Options should be of the \ref isc::perfdhcp::LocalizedOption
+    /// type with offset values provided. Each added option will
+    /// be updated with actual data read from the binary packet buffer.
+    ///
+    /// \return false if unpack operation failed.
+    bool rawUnpack();
+
+    /// \brief Replace contents of buffer with data.
+    ///
+    /// Function replaces part of the buffer with data from vector.
+    ///
+    /// \param dest_pos position in buffer where data is replaced.
+    /// \param first beginning of data range in source vector.
+    /// \param last end of data range in source vector.
+    void writeAt(size_t dest_pos,
+                 std::vector<uint8_t>::iterator first,
+                 std::vector<uint8_t>::iterator last);
+
+    /// \brief Replace contents of buffer with value.
+    ///
+    /// Function replaces part of buffer with value.
+    ///
+    /// \param dest_pos position in buffer where value is
+    /// to be written.
+    /// \param val value to be written.
+    template<typename T>
+    void writeValueAt(size_t dest_pos, T val) {
+        PktTransform::writeValueAt<T>(data_, dest_pos, val);
+    }
+
+private:
+    size_t transid_offset_;      ///< transaction id offset
+
+};
+
+typedef boost::shared_ptr<PerfPkt6> PerfPkt6Ptr;
+
+} // namespace perfdhcp
+} // namespace isc
+
+#endif // PERF_PKT6_H
diff --git a/src/bin/perfdhcp/perf_socket.cc b/src/bin/perfdhcp/perf_socket.cc
new file mode 100644
index 0000000..aa67796
--- /dev/null
+++ b/src/bin/perfdhcp/perf_socket.cc
@@ -0,0 +1,195 @@
+// Copyright (C) 2012-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+#include <config.h>
+
+#include <perfdhcp/perf_socket.h>
+#include <perfdhcp/command_options.h>
+#include <perfdhcp/stats_mgr.h>
+
+#include <dhcp/iface_mgr.h>
+#include <asiolink/io_address.h>
+
+using namespace isc::dhcp;
+using namespace isc::asiolink;
+
+namespace isc {
+namespace perfdhcp {
+
+PerfSocket::PerfSocket(CommandOptions& options) {
+    sockfd_ = openSocket(options);
+    initSocketData();
+}
+
+
+int
+PerfSocket::openSocket(CommandOptions& options) const {
+    std::string localname = options.getLocalName();
+    std::string servername = options.getServerName();
+    uint16_t port = options.getLocalPort();
+    int sock = 0;
+
+    uint8_t family = (options.getIpVersion() == 6) ? AF_INET6 : AF_INET;
+    IOAddress remoteaddr(servername);
+
+    // Check for mismatch between IP option and server address
+    if (family != remoteaddr.getFamily()) {
+        isc_throw(InvalidParameter,
+                  "Values for IP version: " <<
+                  static_cast<unsigned int>(options.getIpVersion()) <<
+                  " and server address: " << servername << " are mismatched.");
+    }
+
+    if (port == 0) {
+        if (family == AF_INET6) {
+            // need server port (547) because the server is acting as a relay agent
+            port = DHCP6_CLIENT_PORT;
+            // if acting as a relay agent change port.
+            if (options.isUseRelayedV6()) {
+              port = DHCP6_SERVER_PORT;
+            }
+        } else if (options.getIpVersion() == 4) {
+            port = 67; /// @todo: find out why port 68 is wrong here.
+        }
+    }
+
+    // Local name is specified along with '-l' option.
+    // It may point to interface name or local address.
+    if (!localname.empty()) {
+        // CommandOptions should be already aware whether local name
+        // is interface name or address because it uses IfaceMgr to
+        // scan interfaces and get's their names.
+        if (options.isInterface()) {
+            sock = IfaceMgr::instance().openSocketFromIface(localname,
+                                                            port,
+                                                            family);
+        } else {
+            IOAddress localaddr(localname);
+            sock = IfaceMgr::instance().openSocketFromAddress(localaddr,
+                                                              port);
+        }
+    } else if (!servername.empty()) {
+        // If only server name is given we will need to try to resolve
+        // the local address to bind socket to based on remote address.
+        sock = IfaceMgr::instance().openSocketFromRemoteAddress(remoteaddr,
+                                                                port);
+    }
+    if (sock <= 0) {
+        isc_throw(BadValue, "unable to open socket to communicate with "
+                  "DHCP server");
+    }
+
+    // IfaceMgr does not set broadcast option on the socket. We rely
+    // on CommandOptions object to find out if socket has to have
+    // broadcast enabled.
+    if ((options.getIpVersion() == 4) && options.isBroadcast()) {
+        int broadcast_enable = 1;
+        int ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST,
+                             &broadcast_enable, sizeof(broadcast_enable));
+        if (ret < 0) {
+            isc_throw(InvalidOperation,
+                      "unable to set broadcast option on the socket");
+        }
+    } else if (options.getIpVersion() == 6) {
+        // If remote address is multicast we need to enable it on
+        // the socket that has been created.
+        if (remoteaddr.isV6Multicast()) {
+            int hops = 1;
+            int ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+                                 &hops, sizeof(hops));
+            // If user specified interface name with '-l' the
+            // IPV6_MULTICAST_IF has to be set.
+            if ((ret >= 0)  && options.isInterface()) {
+                IfacePtr iface =
+                    IfaceMgr::instance().getIface(options.getLocalName());
+                if (iface == NULL) {
+                    isc_throw(Unexpected, "unknown interface "
+                              << options.getLocalName());
+                }
+                int idx = iface->getIndex();
+                ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_IF,
+                                     &idx, sizeof(idx));
+            }
+            if (ret < 0) {
+                isc_throw(InvalidOperation,
+                          "unable to enable multicast on socket " <<  sock
+                          << ". errno = " << errno);
+            }
+        }
+    }
+
+    return (sock);
+}
+
+PerfSocket::~PerfSocket() {
+    IfacePtr iface = IfaceMgr::instance().getIface(ifindex_);
+    if (iface) {
+        iface->delSocket(sockfd_);
+    }
+}
+
+void
+PerfSocket::initSocketData() {
+    for (IfacePtr iface : IfaceMgr::instance().getIfaces()) {
+        for (SocketInfo s : iface->getSockets()) {
+            if (s.sockfd_ == sockfd_) {
+                ifindex_ = iface->getIndex();
+                addr_ = s.addr_;
+                return;
+            }
+        }
+    }
+    isc_throw(BadValue, "interface for specified socket descriptor not found");
+}
+
+Pkt4Ptr
+PerfSocket::receive4(uint32_t timeout_sec, uint32_t timeout_usec) {
+    Pkt4Ptr pkt = IfaceMgr::instance().receive4(timeout_sec, timeout_usec);
+    if (pkt) {
+        try {
+            pkt->unpack();
+        } catch (const std::exception &e) {
+                ExchangeStats::malformed_pkts_++;
+                std::cout << "Incorrect DHCP packet received"
+                          << e.what() << std::endl;
+        }
+    }
+    return (pkt);
+}
+
+Pkt6Ptr
+PerfSocket::receive6(uint32_t timeout_sec, uint32_t timeout_usec) {
+    Pkt6Ptr pkt = IfaceMgr::instance().receive6(timeout_sec, timeout_usec);
+    if (pkt) {
+        try {
+            pkt->unpack();
+        } catch (const std::exception &e) {
+                ExchangeStats::malformed_pkts_++;
+                std::cout << "Incorrect DHCP packet received"
+                          << e.what() << std::endl;
+        }
+    }
+    return (pkt);
+}
+
+bool
+PerfSocket::send(const Pkt4Ptr& pkt) {
+    return IfaceMgr::instance().send(pkt);
+}
+
+bool
+PerfSocket::send(const Pkt6Ptr& pkt) {
+    return IfaceMgr::instance().send(pkt);
+}
+
+IfacePtr
+PerfSocket::getIface() {
+    return (IfaceMgr::instance().getIface(ifindex_));
+}
+
+}
+}
diff --git a/src/bin/perfdhcp/perf_socket.h b/src/bin/perfdhcp/perf_socket.h
new file mode 100644
index 0000000..bafe0ec
--- /dev/null
+++ b/src/bin/perfdhcp/perf_socket.h
@@ -0,0 +1,143 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PERF_SOCKET_H
+#define PERF_SOCKET_H
+
+#include <perfdhcp/command_options.h>
+
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcp/socket_info.h>
+#include <dhcp/iface_mgr.h>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief Socket wrapper structure.
+///
+/// This is a base class that is inherited by PerfSocket
+/// and unit tests derived that. This way it allows mocking
+/// out socket operations and avoid using real network
+/// interfaces.
+class BasePerfSocket : public dhcp::SocketInfo {
+public:
+    /// Interface index.
+    unsigned int ifindex_;
+
+    /// \brief Default constructor of BasePerfSocket.
+    BasePerfSocket() :
+        SocketInfo(asiolink::IOAddress("127.0.0.1"), 0, 0),
+        ifindex_(0) {}
+
+    /// \brief Destructor of the socket wrapper class.
+    virtual ~BasePerfSocket() = default;
+
+    /// \brief See description of this method in PerfSocket class below.
+    virtual dhcp::Pkt4Ptr receive4(uint32_t timeout_sec, uint32_t timeout_usec) = 0;
+
+    /// \brief See description of this method in PerfSocket class below.
+    virtual dhcp::Pkt6Ptr receive6(uint32_t timeout_sec, uint32_t timeout_usec) = 0;
+
+    /// \brief See description of this method in PerfSocket class below.
+    virtual bool send(const dhcp::Pkt4Ptr& pkt) = 0;
+
+    /// \brief See description of this method in PerfSocket class below.
+    virtual bool send(const dhcp::Pkt6Ptr& pkt) = 0;
+
+    /// \brief See description of this method in PerfSocket class below.
+    virtual dhcp::IfacePtr getIface() = 0;
+};
+
+/// \brief Socket wrapper structure.
+///
+/// This is the wrapper that holds descriptor of the socket
+/// used to run DHCP test. The wrapped socket is closed in
+/// the destructor. This prevents resource leaks when
+/// function that created the socket ends (normally or
+/// when exception occurs). This structure extends parent
+/// structure with new field ifindex_ that holds interface
+/// index where socket is bound to.
+class PerfSocket : public BasePerfSocket {
+public:
+    /// \brief Constructor of socket wrapper class.
+    ///
+    /// This constructor uses provided socket descriptor to
+    /// find the name of the interface where socket has been
+    /// bound to.
+    PerfSocket(CommandOptions& options);
+
+    /// \brief Destructor of the socket wrapper class.
+    ///
+    /// Destructor closes wrapped socket.
+    virtual ~PerfSocket();
+
+    /// \brief Receive DHCPv4 packet from interface.
+    ///
+    /// \param timeout_sec number of seconds for waiting for a packet,
+    /// \param timeout_usec number of microseconds for waiting for a packet,
+    /// \return received packet or nullptr if timed out
+    virtual dhcp::Pkt4Ptr receive4(uint32_t timeout_sec, uint32_t timeout_usec) override;
+
+    /// \brief Receive DHCPv6 packet from interface.
+    ///
+    /// \param timeout_sec number of seconds for waiting for a packet,
+    /// \param timeout_usec number of microseconds for waiting for a packet,
+    /// \return received packet or nullptr if timed out
+    virtual dhcp::Pkt6Ptr receive6(uint32_t timeout_sec, uint32_t timeout_usec) override;
+
+    /// \brief Send DHCPv4 packet through interface.
+    ///
+    /// \param pkt a packet for sending
+    /// \return true if operation succeeded
+    virtual bool send(const dhcp::Pkt4Ptr& pkt) override;
+
+    /// \brief Send DHCPv6 packet through interface.
+    ///
+    /// \param pkt a packet for sending
+    /// \return true if operation succeeded
+    virtual bool send(const dhcp::Pkt6Ptr& pkt) override;
+
+    /// \brief Get interface from IfaceMgr.
+    ///
+    /// \return shared pointer to Iface.
+    virtual dhcp::IfacePtr getIface() override;
+
+protected:
+    /// \brief Initialize socket data.
+    ///
+    /// This method initializes members of the class that Interface
+    /// Manager holds: interface name, local address.
+    ///
+    /// \throw isc::BadValue if interface for specified socket
+    /// descriptor does not exist.
+    void initSocketData();
+
+    /// \brief Open socket to communicate with DHCP server.
+    ///
+    /// Method opens socket and binds it to local address. Function will
+    /// use either interface name, local address or server address
+    /// to create a socket, depending on what is available (specified
+    /// from the command line). If socket can't be created for any
+    /// reason, exception is thrown.
+    /// If destination address is broadcast (for DHCPv4) or multicast
+    /// (for DHCPv6) than broadcast or multicast option is set on
+    /// the socket. Opened socket is registered and managed by IfaceMgr.
+    ///
+    /// \throw isc::BadValue if socket can't be created for given
+    /// interface, local address or remote address.
+    /// \throw isc::InvalidOperation if broadcast option can't be
+    /// set for the v4 socket or if multicast option can't be set
+    /// for the v6 socket.
+    /// \throw isc::Unexpected if internal unexpected error occurred.
+    /// \return socket descriptor.
+    int openSocket(CommandOptions& options) const;
+};
+
+}
+}
+
+#endif /* PERF_SOCKET_H */
diff --git a/src/bin/perfdhcp/perfdhcp_internals.dox b/src/bin/perfdhcp/perfdhcp_internals.dox
new file mode 100644
index 0000000..078cb57
--- /dev/null
+++ b/src/bin/perfdhcp/perfdhcp_internals.dox
@@ -0,0 +1,164 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// @namespace perfdhcp
+/// @page perfdhcpInternals perfdhcp Internals
+///
+/// The perfdhcp utility provides a way of measuring the performance of
+/// DHCP servers by generating large amounts of traffic. Written in C++,
+/// its use is described in detail in the DHCP Performance Guide.
+///
+/// This document is aimed at people wishing to understand the internals
+/// of the perfdhcp program. It describes the major components in the
+/// utility and their interaction.
+///
+/// @section perfdhcpClasses perfdhcp Classes
+///
+/// @subsection perfdhcpCommandOptions CommandOptions (Command Options)
+///
+/// isc::perfdhcp::CommandOptions is a singleton class that parses
+/// the perfdhcp command line parameters and initializes its members
+/// accordingly. If the parameters are invalid, the parser method throws
+/// an exception.  Usage is simple:
+///
+/// @code int main(int argc, char* argv[]) {
+///     try {
+///         CommandOptions& command_options = CommandOptions::instance();
+///         command_options.parse(argc, argv);
+///     } catch(const Exception& e) {
+///         ...
+///     }
+/// @endcode
+///
+/// If the argument parsing is successful, the parsed values can be read
+/// from the isc::perfdhcp::CommandOptions singleton from any class or
+/// function in the program, e.g.
+///
+/// @code
+///     int rate = CommandOptions::instance().getRate();
+/// @endcode
+///
+/// @subsection perfdhcpTestControl TestControl (Test Control)
+///
+/// The isc::perfdhcp::TestControl singleton is responsible
+/// for test execution coordination.  It relies on the
+/// isc::perfdhcp::CommandOptions object to get all required test
+/// parameters and for this reason, isc::perfdhcp::CommandOptions has
+/// to be initialized and isc::perfdhcp::CommandOptions::parse() called
+/// prior to calling isc::perfdhcp::TestControl::run().
+///
+/// isc::perfdhcp::TestControl::run() performs initialization of
+/// isc::perfdhcp::TestControl then executes the main program loop. In
+/// detail, isc::perfdhcp::TestControl::run() performs the following
+/// major operations:
+///
+/// -# check if the command line has been parsed,
+/// -# print diagnostics if specified from command line,
+/// -# register DHCP options factory functions,
+/// -# read packet templates from files,
+/// -# initialize the isc::perfdhcp::StatisticsManager object,
+/// -# set interrupt signal handler (handle ^C),
+/// -# open and close socket for communication with server,
+/// -# coordinate sending and receiving packets,
+/// -# coordinate intermediate reporting,
+/// -# prints test statistics.
+///
+/// isc::perfdhcp::TestControl is a singleton object, so there is one sole
+/// instance of it throughout the program. In order to allow the running
+/// of unit tests, where a single instance of isc::perfdhcp::TestControl
+/// is used multiple times with different command line options, a
+/// isc::perfdhcp::TestControl::reset() function is provided to reset
+/// the state of the class members. Also, functions that initialize
+/// various class members (such as  Statistics Manager) will release
+/// any objects from previous test runs.
+///
+/// @subsection perfStatsMgr StatsMgr (Statistics Manager)
+///
+/// isc::perfdhcp::StatsMgr is a class that holds all performance
+/// statistics gathered throughout the test execution and is created
+/// in isc::perfdhcp::TestControl.  isc::perfdhcp::TestControl posts all
+/// sent and received packets to isc::perfdhcp::StatsMgr: outgoing packets
+/// are recorded and incoming packets are matched with the corresponding
+/// outgoing packer to calculate calculate round trip time, number of
+/// packet drops etc. Apart from the standard counters implemented in
+/// isc::perfdhcp::StatsMgr, custom (named) counters can be specified and
+/// incremented by the calling class. isc::perfdhcp::StatsMgr also exposes
+/// multiple functions that print gathered statistics into the console.
+///
+/// isc::perfdhcp::StatsMgr is a template class that takes an
+/// isc::dhcp::Pkt4, isc::dhcp::Pkt6, isc::perfdhcp::PerfPkt4
+/// or isc::perfdhcp::PerfPkt6 as a typename. An instance of
+/// isc::perfdhcp::StatsMgr can be created by:
+///
+/// @code
+///     typedef StatsMgr<Pkt4> StatsMgr4; StatsMgr4 stats_mgr4 =
+///     boost::shared_ptr<StatsMgr4>(new StatsMgr4()); try {
+///         stats_mgr->addExchangeStats(StatsMgr4::XCHG_DO);
+///     } catch(const Exception& e) {
+///         std::cout << e.what() << std::endl;
+///     }
+/// @endcode
+///
+/// The isc::perfdhcp::StatsMgr instance created in the example above will be used
+/// for DHCPv4 testing (i.e. to collect DHCPv4 packets) and will be
+/// configured to monitor statistics for DISCOVER-OFFER packet exchanges.
+///
+/// @subsection  perfdhcpPkt PerfPkt4 and PerfPkt6
+///
+/// The isc::perfdhcp::PerfPkt4 and isc::perfdhcp::PerfPkt6 classes
+/// are derived from isc::dhcp::Pkt4 and isc::dhcp::Pkt6.  They extend
+/// the parent class functionality by adding support for template
+/// files. Instances of these classes can be created using a raw buffer
+/// (read from a packet template file).  Once the packet object is
+/// initialized, it is possible to replace parts of the on-wire data by
+/// using the isc::perfdhcp::LocalizedOption mechanism.
+///
+/// @subsection perfdhcpLocalizedOption LocalizedOption (Localized Option)
+///
+/// isc::perfdhcp::LocalizedOption derives from the isc::dhcp::Option
+/// class. It represents the DHCP option (v4 or v6) to be
+/// placed at specified position in the packet buffer (see @ref
+/// perfdhcpPkt). Such an option is added to the option collection in
+/// a isc::perfdhcp::PerfPkt4 or isc::perfdhcp::PerfPkt6 object; when
+/// any of PerfPktX::rawPack() functions are called their content is
+/// stored in the packet output buffer at the position pointed to by
+/// the isc::perfdhcp::LocalizedOption object.
+///
+/// isc::perfdhcp::LocalizedOption also allows the reading of the
+/// on wire data in received packet at the specified position. In
+/// this case, isc::perfdhcp::LocalizedOption has to be created and
+/// added to the received packet.  When PerfPktX::rawUnpack() is
+/// called, the contents of the buffer will be read and stored in a
+/// isc::perfdhcp::LocalizedOption object for further processing.
+///
+/// The following code shows how to create a packet from a
+/// (template) buffer and replace option data in the buffer with
+/// isc::perfdhcp::LocalizedOption.
+///
+/// @code
+///     OptionBuffer buf; // fill buf with data here.  ...
+///     boost::scoped_ptr<PerfPkt4> pkt(new PerfPkt4(&buf[0], buf.size());
+///     const size_t offset_hostname = 240;
+///     OptionBuffer vec_hostname;
+///     // fill the hostname vector with data ...
+///     LocalizedOptionPtr opt_hostname(new LocalizedOption(Option::V4,
+///                                                           DHO_HOST_NAME,
+///                                                           vec_hostname,
+///                                                           offset_hostname));
+///     pkt->addOption(opt_hostname);
+///     // by calling rawPack() we replace the packet contents with option
+///     // contents at buffer position 240.
+///     pkt->rawPack();
+/// @endcode
+///
+/// @subsection perfdhcpPktTransform PktTransform (Packet Transform)
+///
+/// The isc::perfdhcp::PktTransform helper class contains the
+/// static functions to pack and unpack DHCP options (specifically
+/// isc::perfdhcp::LocalizedOption) to and from the packet buffer. This
+/// logic has been moved away from isc::perfdhcp::PerfPkt4 and
+/// isc::perfdhcp::PerfPkt6 classes to isc::perfdhcp::PktTransform
+/// because PerfPktX classes share the logic here.
diff --git a/src/bin/perfdhcp/pkt_transform.cc b/src/bin/perfdhcp/pkt_transform.cc
new file mode 100644
index 0000000..7aaf9c6
--- /dev/null
+++ b/src/bin/perfdhcp/pkt_transform.cc
@@ -0,0 +1,223 @@
+// Copyright (C) 2012-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/pkt_transform.h>
+#include <perfdhcp/localized_option.h>
+#include <perfdhcp/stats_mgr.h>
+
+#include <exceptions/exceptions.h>
+#include <dhcp/option.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/dhcp6.h>
+
+#include <iostream>
+
+
+using namespace std;
+using namespace isc;
+using namespace dhcp;
+
+namespace isc {
+namespace perfdhcp {
+
+bool
+PktTransform::pack(const Option::Universe universe,
+                   const OptionBuffer& in_buffer,
+                   const OptionCollection& options,
+                   const size_t transid_offset,
+                   const uint32_t transid,
+                   util::OutputBuffer& out_buffer) {
+
+    // Always override the packet if function is called.
+    out_buffer.clear();
+    // Write whole buffer to output buffer.
+    out_buffer.writeData(&in_buffer[0], in_buffer.size());
+
+    uint8_t transid_len = (universe == Option::V6) ? 3 : 4;
+
+    if ((transid_offset + transid_len >= in_buffer.size()) ||
+        (transid_offset == 0)) {
+        cout << "Failed to build packet: provided transaction id offset: "
+             << transid_offset <<  " is out of bounds (expected 1.."
+             << in_buffer.size()-1 << ")." << endl;
+        return (false);
+    }
+
+    try {
+        size_t offset_ptr = transid_offset;
+        if (universe == Option::V4) {
+            out_buffer.writeUint8At(transid >> 24 & 0xFF, offset_ptr++);
+        }
+        out_buffer.writeUint8At(transid >> 16 & 0xFF, offset_ptr++);
+        out_buffer.writeUint8At(transid >> 8 & 0xFF, offset_ptr++);
+        out_buffer.writeUint8At(transid & 0xFF, offset_ptr++);
+
+        // We already have packet template stored in output buffer
+        // but still some options have to be updated if client
+        // specified them along with their offsets in the buffer.
+        PktTransform::packOptions(in_buffer, options, out_buffer);
+    } catch (const isc::BadValue& e) {
+        cout << "Building packet failed: " << e.what() << endl;
+        return (false);
+    }
+    return (true);
+}
+
+bool
+PktTransform::unpack(const Option::Universe universe,
+                     const OptionBuffer& in_buffer,
+                     const OptionCollection& options,
+                     const size_t transid_offset,
+                     uint32_t& transid) {
+
+    uint8_t transid_len = (universe == Option::V6) ? 3 : 4;
+
+    // Validate transaction id offset.
+    if ((transid_offset + transid_len + 1 > in_buffer.size()) ||
+        (transid_offset == 0)) {
+        cout << "Failed to parse packet: provided transaction id offset: "
+             << transid_offset <<  " is out of bounds (expected 1.."
+             << in_buffer.size()-1 << ")." << endl;
+        return (false);
+    }
+
+    // Read transaction id from the buffer.
+    // For DHCPv6 we transaction id is 3 bytes long so the high byte
+    // of transid will be zero.
+    OptionBufferConstIter it = in_buffer.begin() + transid_offset;
+    transid = 0;
+    for (int i = 0; i < transid_len; ++i, ++it) {
+        // Read next byte and shift it left to its position in
+        // transid (shift by the number of bytes read so far.
+        transid += *it << (transid_len - i - 1) * 8;
+    }
+
+    try {
+        PktTransform::unpackOptions(in_buffer, options);
+    } catch (const isc::BadValue& e) {
+        ExchangeStats::malformed_pkts_++;
+        cout << "Packet parsing failed: " << e.what() << endl;
+        return (false);
+    }
+
+    return (true);
+}
+
+void
+PktTransform::packOptions(const OptionBuffer& in_buffer,
+                          const OptionCollection& options,
+                          util::OutputBuffer& out_buffer) {
+    try {
+        // If there are any options on the list, we will use provided
+        // options offsets to override them in the output buffer
+        // with new contents.
+        for (OptionCollection::const_iterator it = options.begin();
+             it != options.end(); ++it) {
+            // Get options with their position (offset).
+            boost::shared_ptr<LocalizedOption> option =
+                boost::dynamic_pointer_cast<LocalizedOption>(it->second);
+            if (option == NULL) {
+                isc_throw(isc::BadValue, "option is null");
+            }
+            uint32_t offset = option->getOffset();
+            if ((offset == 0) ||
+                (offset + option->len() > in_buffer.size())) {
+                isc_throw(isc::BadValue,
+                          "option offset for option: " << option->getType()
+                          << " is out of bounds (expected 1.."
+                          << in_buffer.size() - option->len() << ")");
+            }
+
+            // Create temporary buffer to store option contents.
+            util::OutputBuffer buf(option->len());
+            // Pack option contents into temporary buffer.
+            option->pack(buf);
+            // OutputBuffer class has nice functions that write
+            // data at the specified position so we can use it to
+            // inject contents of temporary buffer to output buffer.
+            const uint8_t *buf_data =
+                static_cast<const uint8_t*>(buf.getData());
+            for (size_t i = 0; i < buf.getLength(); ++i) {
+                out_buffer.writeUint8At(buf_data[i], offset + i);
+            }
+        }
+    }
+    catch (const Exception&) {
+        isc_throw(isc::BadValue, "failed to pack options into buffer.");
+    }
+}
+
+void
+PktTransform::unpackOptions(const OptionBuffer& in_buffer,
+                            const OptionCollection& options) {
+    for (OptionCollection::const_iterator it = options.begin();
+         it != options.end(); ++it) {
+
+        boost::shared_ptr<LocalizedOption> option =
+            boost::dynamic_pointer_cast<LocalizedOption>(it->second);
+        if (option == NULL) {
+            isc_throw(isc::BadValue, "option is null");
+        }
+        size_t opt_pos = option->getOffset();
+        if (opt_pos == 0) {
+            isc_throw(isc::BadValue, "failed to unpack packet from raw buffer "
+                      "(Option position not specified)");
+        } else if (opt_pos + option->getHeaderLen() > in_buffer.size()) {
+            isc_throw(isc::BadValue,
+                      "failed to unpack options from from raw buffer "
+                      "(Option position out of bounds)");
+        }
+
+        size_t offset = opt_pos;
+        size_t offset_step = 1;
+        uint16_t opt_type = 0;
+        if (option->getUniverse() == Option::V6) {
+            offset_step = 2;
+            // For DHCPv6 option type is in first two octets.
+            opt_type = in_buffer[offset] * 256 + in_buffer[offset + 1];
+        } else {
+            // For DHCPv4 option type is in first octet.
+            opt_type = in_buffer[offset];
+        }
+        // Check if we got expected option type.
+        if (opt_type != option->getType()) {
+            isc_throw(isc::BadValue,
+                      "failed to unpack option from raw buffer "
+                      "(option type mismatch)");
+        }
+
+        // Get option length which is supposed to be after option type.
+        offset += offset_step;
+        const uint16_t opt_len =
+            (option->getUniverse() == Option::V6) ?
+            in_buffer[offset] * 256 + in_buffer[offset + 1] :
+            in_buffer[offset];
+
+        // Check if packet is not truncated.
+        if (offset + option->getHeaderLen() + opt_len > in_buffer.size()) {
+            isc_throw(isc::BadValue,
+                      "failed to unpack option from raw buffer "
+                      "(option truncated)");
+        }
+
+        // Seek to actual option data and replace it.
+        offset += offset_step;
+        option->setData(in_buffer.begin() + offset,
+                        in_buffer.begin() + offset + opt_len);
+    }
+}
+
+void
+PktTransform::writeAt(dhcp::OptionBuffer& in_buffer, size_t dest_pos,
+                      dhcp::OptionBuffer::iterator first,
+                      dhcp::OptionBuffer::iterator last) {
+    memcpy(&in_buffer[dest_pos], &(*first), std::distance(first, last));
+}
+
+} // namespace perfdhcp
+} // namespace isc
diff --git a/src/bin/perfdhcp/pkt_transform.h b/src/bin/perfdhcp/pkt_transform.h
new file mode 100644
index 0000000..99cdb19
--- /dev/null
+++ b/src/bin/perfdhcp/pkt_transform.h
@@ -0,0 +1,161 @@
+// Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PKT_TRANSFORM_H
+#define PKT_TRANSFORM_H
+
+#include <perfdhcp/localized_option.h>
+
+#include <dhcp/option.h>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief Read and write raw data to DHCP packets.
+///
+/// This class provides static functions to read/write raw data from/to the
+/// packet buffer. When reading data with the unpack() method, the
+/// corresponding options objects are updated.  When writing to the packet
+/// buffer with pack(), options objects carry input data to be written.
+///
+/// This class is used both by \ref PerfPkt4 and
+/// \ref PerfPkt6 classes in case DHCP packets are created
+/// from template files. In this case, some of the template
+/// packet's options are replaced before sending it to the
+/// server. Offset of specific options are provided from the
+/// command line by the perfdhcp tool user, and passed in an
+/// options collection.
+class PktTransform {
+public:
+
+    /// \brief Prepares on-wire format from raw buffer.
+    ///
+    /// The method copies the input buffer and options contents
+    /// to the output buffer. The input buffer must contain whole
+    /// initial packet data. Parts of this data will be
+    /// overridden by options data specified in an options
+    /// collection. Such options must have their offsets within
+    /// a packet specified (see \ref LocalizedOption to find out
+    /// how to specify options offset).
+    ///
+    /// \note The specified options must fit into the size of the
+    /// initial packet data. A call to this method will fail
+    /// if the option's offset + its size is beyond the packet's size.
+    ///
+    /// \param universe Universe used, V4 or V6
+    /// \param in_buffer Input buffer holding initial packet
+    /// data, this can be directly read from template file
+    /// \param options Options collection with offsets
+    /// \param transid_offset offset of transaction id in a packet,
+    /// transaction ID will be written to output buffer at this
+    /// offset
+    /// \param transid Transaction ID value
+    /// \param out_buffer Output buffer holding "packed" data
+    ///
+    /// \return false, if pack operation failed.
+    static bool pack(const dhcp::Option::Universe universe,
+                     const dhcp::OptionBuffer& in_buffer,
+                     const dhcp::OptionCollection& options,
+                     const size_t transid_offset,
+                     const uint32_t transid,
+                     util::OutputBuffer& out_buffer);
+
+    /// \brief Handles selective binary packet parsing.
+    ///
+    /// This method handles the parsing of packets that have non-default
+    /// options or transaction ID offsets. The client class has to use
+    /// \ref isc::dhcp::Pkt6::addOption to specify which options to parse.
+    /// Each option should be of the \ref isc::perfdhcp::LocalizedOption
+    /// type with the offset value specified.
+    ///
+    /// \param universe universe used, V4 or V6
+    /// \param in_buffer input buffer to be parsed
+    /// \param options options collection with options offsets
+    /// \param transid_offset offset of transaction id in input buffer
+    /// \param transid transaction id value read from input buffer
+    ///
+    /// \return false, if unpack operation failed.
+    static bool unpack(const dhcp::Option::Universe universe,
+                       const dhcp::OptionBuffer& in_buffer,
+                       const dhcp::OptionCollection& options,
+                       const size_t transid_offset,
+                       uint32_t& transid);
+
+    /// \brief Replace contents of buffer with vector.
+    ///
+    /// Function replaces data of the buffer with data from vector.
+    ///
+    /// \param in_buffer destination buffer.
+    /// \param dest_pos position in destination buffer.
+    /// \param first beginning of data range in source vector.
+    /// \param last end of data range in source vector.
+    static void writeAt(dhcp::OptionBuffer& in_buffer, size_t dest_pos,
+                        std::vector<uint8_t>::iterator first,
+                        std::vector<uint8_t>::iterator last);
+
+    /// \brief Replace contents of one vector with uint16 value.
+    ///
+    /// Function replaces data inside one vector with uint16_t value.
+    ///
+    /// \param in_buffer destination buffer.
+    /// \param dest_pos position in destination buffer.
+    /// \param val value to be written.
+    template<typename T>
+    static void writeValueAt(dhcp::OptionBuffer& in_buffer, size_t dest_pos,
+                        T val) {
+        // @todo consider replacing the loop with switch statement
+        // checking sizeof(T).
+        for (int i = 0; i < sizeof(T); ++i) {
+            in_buffer[dest_pos + i] = (val >> 8 * (sizeof(T) - i - 1)) & 0xFF;
+        }
+    }
+
+private:
+    /// \brief Replaces contents of options in a buffer.
+    ///
+    /// The method uses a localized options collection to
+    /// replace parts of packet data (e.g. data read
+    /// from template file).
+    /// This private method is called from \ref PktTransform::pack
+    ///
+    /// \param in_buffer input buffer holding initial packet data.
+    /// \param out_buffer output buffer with "packed" options.
+    /// \param options options collection with actual data and offsets.
+    ///
+    /// \throw isc::Unexpected if options update failed.
+    static void packOptions(const dhcp::OptionBuffer& in_buffer,
+                            const dhcp::OptionCollection& options,
+                            util::OutputBuffer& out_buffer);
+
+    /// \brief Reads contents of specified options from buffer.
+    ///
+    /// The method reads options data from the input buffer
+    /// and stores it in options objects. Offsets of the options
+    /// must be specified (see \ref LocalizedOption to find out how to specify
+    /// the option offset).
+    /// This private method is called by \ref PktTransform::unpack.
+    ///
+    /// \note This method iterates through all options in an
+    /// options collection, checks the offset of the option
+    /// in input buffer and reads data from the buffer to
+    /// update the option's buffer. If the provided options collection
+    /// is empty, a call to this method will have no effect.
+    ///
+    /// \param universe universe used, V4 or V6
+    /// \param in_buffer input buffer to be parsed.
+    /// \param options options collection with their offsets
+    /// in input buffer specified.
+    ///
+    /// \throw isc::Unexpected if options unpack failed.
+    static void unpackOptions(const dhcp::OptionBuffer& in_buffer,
+                              const dhcp::OptionCollection& options);
+
+};
+
+} // namespace perfdhcp
+} // namespace isc
+
+#endif // PKT_TRANSFORM_H
diff --git a/src/bin/perfdhcp/random_number_generator.h b/src/bin/perfdhcp/random_number_generator.h
new file mode 100644
index 0000000..ce5a386
--- /dev/null
+++ b/src/bin/perfdhcp/random_number_generator.h
@@ -0,0 +1,202 @@
+// Copyright (C) 2010-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef NSAS_RANDOM_NUMBER_GENERATOR_H
+#define NSAS_RANDOM_NUMBER_GENERATOR_H
+
+#include <algorithm>
+#include <cmath>
+#include <iterator>
+#include <numeric>
+#include <vector>
+
+#include <exceptions/exceptions.h>
+
+#include <boost/random/mersenne_twister.hpp>
+#include <boost/random/uniform_int.hpp>
+#include <boost/random/uniform_real.hpp>
+#include <boost/random/variate_generator.hpp>
+
+/// PLEASE DO NOT USE THIS IN CRYPTOGRAPHICALLY SENSITIVE CODE.
+
+namespace isc {
+namespace perfdhcp {
+
+class InvalidLimits : public isc::BadValue {
+public:
+    InvalidLimits(const char* file, size_t line, const char* what) :
+        isc::BadValue(file, line, what) {}
+};
+
+class SumNotOne : public isc::BadValue {
+public:
+    SumNotOne(const char* file, size_t line, const char* what) :
+        isc::BadValue(file, line, what) {}
+};
+
+class InvalidProbValue : public isc::BadValue {
+public:
+    InvalidProbValue(const char* file, size_t line, const char* what) :
+        isc::BadValue(file, line, what) {}
+};
+
+
+
+/// \brief Uniform random integer generator
+///
+/// Generate uniformly distributed integers in range of [min, max]
+class UniformRandomIntegerGenerator{
+public:
+    /// \brief Constructor
+    ///
+    /// \param min The minimum number in the range
+    /// \param max The maximum number in the range
+    UniformRandomIntegerGenerator(int min, int max):
+        min_(std::min(min, max)), max_(std::max(min, max)),
+        dist_(min_, max_), generator_(rng_, dist_)
+    {
+        // To preserve the restriction of the underlying uniform_int class (and
+        // to retain compatibility with earlier versions of the class), we will
+        // abort if the minimum and maximum given are the wrong way round.
+        if (min > max) {
+            isc_throw(InvalidLimits, "minimum limit is greater than maximum "
+                      "when initializing UniformRandomIntegerGenerator");
+        }
+
+        // Init with the current time
+        rng_.seed(time(NULL));
+    }
+
+    /// \brief Generate uniformly distributed integer
+    int operator()() { return generator_(); }
+private:
+    /// Hide default and copy constructor
+    UniformRandomIntegerGenerator();///< Default constructor
+    UniformRandomIntegerGenerator(const UniformRandomIntegerGenerator&); ///< Copy constructor
+
+    int min_;                       ///< The minimum integer that can generate
+    int max_;                       ///< The maximum integer that can generate
+    boost::uniform_int<> dist_;     ///< Distribute uniformly.
+    boost::mt19937 rng_;            ///< Mersenne Twister: A 623-dimensionally equidistributed uniform pseudo-random number generator
+    boost::variate_generator<boost::mt19937&, boost::uniform_int<> > generator_; ///< Uniform generator
+};
+
+/// \brief Weighted random integer generator
+///
+/// Generate random integers according different probabilities
+class WeightedRandomIntegerGenerator {
+public:
+    /// \brief Constructor
+    ///
+    /// \param probabilities The probabilities for all the integers, the probability must be
+    /// between 0 and 1.0, the sum of probabilities must be equal to 1.
+    /// For example, if the probabilities contains the following values:
+    /// 0.5 0.3 0.2, the 1st integer will be generated more frequently than the
+    /// other integers and the probability is proportional to its value.
+    /// \param min The minimum integer that generated, other integers will be
+    /// min, min + 1, ..., min + probabilities.size() - 1
+    WeightedRandomIntegerGenerator(const std::vector<double>& probabilities,
+        size_t min = 0):
+        dist_(0, 1.0), uniform_real_gen_(rng_, dist_), min_(min)
+    {
+        // The probabilities must be valid.  Checking is quite an expensive
+        // operation, so is only done in a debug build.
+        areProbabilitiesValid(probabilities);
+
+        // Calculate the partial sum of probabilities
+        std::partial_sum(probabilities.begin(), probabilities.end(),
+                                     std::back_inserter(cumulative_));
+        // Init with the current time
+        rng_.seed(time(NULL));
+    }
+
+    /// \brief Default constructor
+    ///
+    WeightedRandomIntegerGenerator():
+        dist_(0, 1.0), uniform_real_gen_(rng_, dist_), min_(0)
+    {
+    }
+
+    /// \brief Reset the probabilities
+    ///
+    /// Change the weights of each integers
+    /// \param probabilities The probabilities for all the integers
+    /// \param min The minimum integer that generated
+    void reset(const std::vector<double>& probabilities, size_t min = 0)
+    {
+        // The probabilities must be valid.
+        areProbabilitiesValid(probabilities);
+
+        // Reset the cumulative sum
+        cumulative_.clear();
+
+        // Calculate the partial sum of probabilities
+        std::partial_sum(probabilities.begin(), probabilities.end(),
+                                     std::back_inserter(cumulative_));
+
+        // Reset the minimum integer
+        min_ = min;
+    }
+
+    /// \brief Generate weighted random integer
+    size_t operator()()
+    {
+        return std::lower_bound(cumulative_.begin(), cumulative_.end(), uniform_real_gen_())
+            - cumulative_.begin() + min_;
+    }
+
+private:
+    /// \brief Check the validation of probabilities vector
+    ///
+    /// The probability must be in range of [0, 1.0] and the sum must be equal
+    /// to 1.0.  Empty probabilities are also valid.
+    ///
+    /// Checking the probabilities is quite an expensive operation, so it is
+    /// only done during a debug build (via a call through assert()).  However,
+    /// instead of letting assert() call abort(), if this method encounters an
+    /// error, an exception is thrown.  This makes unit testing somewhat easier.
+    ///
+    /// \param probabilities Vector of probabilities.
+    /// \throw InvalidProbValue or SumNotOne when not valid.
+    void areProbabilitiesValid(const std::vector<double>& probabilities) const
+    {
+        double sum = probabilities.empty() ? 1.0 : 0.0;
+        for (const double it : probabilities) {
+            //The probability must be in [0, 1.0]
+            if (it < 0.0 || it > 1.0) {
+                isc_throw(InvalidProbValue,
+                          "probability must be in the range 0..1");
+            }
+
+            sum += it;
+        }
+
+        double epsilon = 0.0001;
+        // The sum must be equal to 1
+        if (std::fabs(sum - 1.0) >= epsilon) {
+            isc_throw(SumNotOne, "Sum of probabilities is not equal to 1");
+        }
+
+        return;
+    }
+
+    std::vector<double> cumulative_;    ///< Partial sum of the probabilities
+    boost::mt19937 rng_;                ///< Mersenne Twister: A 623-dimensionally equidistributed uniform pseudo-random number generator
+    boost::uniform_real<> dist_;        ///< Uniformly distributed real numbers
+
+    // Shortcut typedef
+    // This typedef is placed directly before its use, as the sunstudio
+    // compiler could not handle it being anywhere else (don't know why)
+    typedef boost::variate_generator<boost::mt19937&, boost::uniform_real<> > UniformRealGenerator;
+    UniformRealGenerator uniform_real_gen_;     ///< Uniformly distributed random real numbers generator
+
+    size_t min_;                                ///< The minimum integer that will be generated
+};
+
+}   // namespace perfdhcp
+}   // namespace isc
+
+#endif//NSAS_RANDOM_NUMBER_GENERATOR_H
diff --git a/src/bin/perfdhcp/rate_control.cc b/src/bin/perfdhcp/rate_control.cc
new file mode 100644
index 0000000..5faad79
--- /dev/null
+++ b/src/bin/perfdhcp/rate_control.cc
@@ -0,0 +1,80 @@
+// Copyright (C) 2013-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/rate_control.h>
+
+#include <exceptions/exceptions.h>
+
+
+namespace isc {
+namespace perfdhcp {
+
+using namespace boost::posix_time;
+
+RateControl::RateControl()
+    : rate_(0), total_pkts_sent_count_(0) {
+}
+
+RateControl::RateControl(const unsigned int rate)
+    : rate_(rate), total_pkts_sent_count_(0) {
+}
+
+uint64_t
+RateControl::getOutboundMessageCount(bool const waiting_to_exit /* = false */) {
+    if (total_pkts_sent_count_ == 0) {
+        start_time_ = currentTime();
+        total_pkts_sent_count_ = 1;
+        return 1;
+    }
+
+    // If rate is not limited, then each time send 1 packet.
+    if (getRate() == 0) {
+        return 1;
+    }
+
+    // If we've entered exit wait time's zone, stop sending.
+    if (waiting_to_exit) {
+        return 0;
+    }
+
+    // Estimate number of packets to sent. If we are behind of time we will
+    // try to catch up to upkeep request rate by sending more packets in one cycle.
+    auto now = currentTime();
+    time_period period(start_time_, now);
+    time_duration duration = period.length();
+    uint64_t should_sent_pkts_count = static_cast<double>(getRate()) / static_cast<double>(time_duration::ticks_per_second()) * duration.ticks();
+    if (should_sent_pkts_count <= total_pkts_sent_count_) {
+        return 0;
+    }
+    auto pending_pkts_count = should_sent_pkts_count - total_pkts_sent_count_;
+
+    // Reduce bursts to have more uniform traffic.
+    if (pending_pkts_count > 3) {
+        pending_pkts_count = 3;
+    }
+    total_pkts_sent_count_ += pending_pkts_count;
+
+    return pending_pkts_count;
+}
+
+boost::posix_time::ptime
+RateControl::currentTime() {
+    return (microsec_clock::universal_time());
+}
+
+void
+RateControl::setRate(const int rate) {
+    if (rate < 0) {
+        isc_throw(isc::BadValue, "invalid value of rate " << rate
+                  << ", expected non-negative value");
+    }
+    rate_ = rate;
+}
+
+} // namespace perfdhcp
+} // namespace isc
diff --git a/src/bin/perfdhcp/rate_control.h b/src/bin/perfdhcp/rate_control.h
new file mode 100644
index 0000000..c7756ad
--- /dev/null
+++ b/src/bin/perfdhcp/rate_control.h
@@ -0,0 +1,111 @@
+// Copyright (C) 2013-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef RATE_CONTROL_H
+#define RATE_CONTROL_H
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief A message sending rate control class for perfdhcp.
+///
+/// This class provides the means to control the rate at which messages
+/// of the specific type are sent by perfdhcp. Each message type,
+/// for which the desired rate can be specified, has a corresponding
+/// \c RateControl object. So, the perfdhcp is using up to three objects
+/// of this type at the same time, to control the rate of the following
+/// messages being sent:
+/// - Discover(DHCPv4) or Solicit (DHCPv6)
+/// - Renew (DHCPv6) or Request (DHCPv4) to renew leases.
+/// - Release
+///
+/// The purpose of the RateControl class is to track the due time for
+/// sending next message (or bunch of messages) to keep outbound rate
+/// of particular messages at the desired level. The due time is calculated
+/// using the desired rate value and the timestamp when the last message of
+/// the particular type has been sent. That puts the responsibility on the
+/// \c TestControl class to invoke the \c RateControl::updateSendDue, every
+/// time the message is sent.
+///
+/// The \c RateControl object returns the number of messages to be sent at
+/// the time. The number returned is 0, if perfdhcp shouldn't send any messages
+/// yet, or 1 (sometimes more) if the send due time has been reached.
+class RateControl {
+public:
+
+    /// \brief Default constructor.
+    RateControl();
+
+    /// \brief Constructor which sets desired rate.
+    ///
+    /// \param rate A desired rate.
+    RateControl(const unsigned int rate);
+
+    /// \brief Returns number of messages to be sent "now".
+    ///
+    /// This function calculates how many messages of the given type should
+    /// be sent immediately when the call to the function returns, to catch
+    /// up with the desired message rate.
+    ///
+    /// The value returned depends on the due time calculated with the
+    /// \c RateControl::updateSendDue function and the current time. If
+    /// the due time has been hit, the non-zero number of messages is returned.
+    /// If the due time hasn't been hit, the number returned is 0.
+    ///
+    /// If the rate is non-zero, the number of messages to be sent is calculated
+    /// as follows:
+    /// \code
+    ///          num = duration * rate
+    /// \endcode
+    /// where <b>duration</b> is a time period between the due time to send
+    /// next set of messages and current time. The duration is expressed in
+    /// seconds with the fractional part having 6 or 9 digits (depending on
+    /// the timer resolution). If the calculated value is equal to 0, it is
+    /// rounded to 1, so as at least one message is sent.
+    ///
+    /// \return A number of messages to be sent immediately.
+    uint64_t getOutboundMessageCount(bool const waiting_to_exit = false);
+
+    /// \brief Returns the rate.
+    unsigned int getRate() const {
+        return (rate_);
+    }
+
+    /// \brief Sets the new rate.
+    ///
+    /// \param rate A new value of rate. This value must not be negative.
+    /// \throw isc::BadValue if new rate is negative.
+    void setRate(const int rate);
+
+protected:
+
+    /// \brief Convenience function returning current time.
+    ///
+    /// \return current time.
+    boost::posix_time::ptime currentTime();
+
+    /// \brief Holds a desired rate value.
+    unsigned int rate_;
+
+    /// \brief Holds number of packets send from the beginning.
+
+    /// It is used to calculate current request rate. Then this is used
+    /// to estimate number of packets to send in current cycle.
+    uint64_t total_pkts_sent_count_;
+
+    /// \brief Holds time of start of testing.
+
+    /// It is used to calculate current request rate. Then this is used
+    /// to estimate number of packets to send in current cycle.
+    boost::posix_time::ptime start_time_;
+};
+
+}
+}
+
+#endif
diff --git a/src/bin/perfdhcp/receiver.cc b/src/bin/perfdhcp/receiver.cc
new file mode 100644
index 0000000..2bad426
--- /dev/null
+++ b/src/bin/perfdhcp/receiver.cc
@@ -0,0 +1,145 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/receiver.h>
+#include <perfdhcp/command_options.h>
+
+#include <dhcp/iface_mgr.h>
+
+#include <functional>
+
+using namespace std;
+using namespace isc::dhcp;
+
+namespace isc {
+namespace perfdhcp {
+
+
+void
+Receiver::start() {
+    if (single_threaded_) {
+        return;
+    }
+    if (run_flag_.test_and_set()) {
+        run_flag_.clear();
+        isc_throw(isc::Unexpected, "run_flag_ should be false.");
+    }
+    recv_thread_.reset(new std::thread(std::bind(&Receiver::run, this)));
+}
+
+void
+Receiver::stop() {
+    if (single_threaded_) {
+        return;
+    }
+
+    // If thread is running then...
+    if (run_flag_.test_and_set()) {
+        // Clear flags to order the thread to stop its main loop.
+        run_flag_.clear();
+        recv_thread_->join();
+    }
+}
+
+Receiver::~Receiver() {
+    if (single_threaded_) {
+        return;
+    }
+    stop();
+}
+
+
+PktPtr
+Receiver::getPkt() {
+    if (single_threaded_) {
+        // In single thread mode read packet directly from the socket and return it.
+        return readPktFromSocket();
+    } else {
+        // In multi thread mode read packet from the queue which is feed by Receiver thread.
+        std::lock_guard<std::mutex> lock(pkt_queue_mutex_);
+        if (pkt_queue_.empty()) {
+            if (ip_version_ == 4) {
+                return Pkt4Ptr();
+            } else {
+                return Pkt6Ptr();
+            }
+        }
+        auto pkt = pkt_queue_.front();
+        pkt_queue_.pop();
+        return pkt;
+    }
+}
+
+void
+Receiver::run() {
+    if (single_threaded_) {
+        isc_throw(isc::Unexpected, "run should not be invoked in single-thread mode.");
+    }
+    try {
+        // If the flag is still true receive packets.
+        while (run_flag_.test_and_set()) {
+            receivePackets();
+        }
+
+        // Clear run flag so that subsequent call to stop will not try to stop again.
+        run_flag_.clear();
+    } catch (const exception& e) {
+        cerr << "Something went wrong: " << e.what() << endl;
+        usleep(1000);
+    } catch (...) {
+        cerr << "Something went wrong" << endl;
+        usleep(1000);
+    }
+}
+
+PktPtr
+Receiver::readPktFromSocket() {
+    PktPtr pkt;
+    uint32_t timeout;
+    if (single_threaded_) {
+        // In case of single thread just check socket and if empty exit immediately
+        // to not slow down sending part.
+        timeout = 0;
+    } else {
+        // In case of multi thread wait for packets a little bit (1ms) as it is run
+        // in separate thread and do not interfere with sending thread.
+        timeout = 1000;
+    }
+    try {
+        if (ip_version_ == 4) {
+            pkt = socket_.receive4(0, timeout);
+        } else {
+            pkt = socket_.receive6(0, timeout);
+        }
+    } catch (const Exception& e) {
+        cerr << "Failed to receive DHCP packet: " << e.what() << endl;
+    }
+
+    return (pkt);
+}
+
+void
+Receiver::receivePackets() {
+    while (true) {
+        PktPtr pkt = readPktFromSocket();
+        if (!pkt) {
+            break;
+        }
+
+        // Drop the packet if not supported. Do not bother main thread about it.
+        if (pkt->getType() == DHCPOFFER || pkt->getType() == DHCPACK ||
+            pkt->getType() == DHCPV6_ADVERTISE || pkt->getType() == DHCPV6_REPLY) {
+            // Otherwise push the packet to the queue, to main thread.
+            std::lock_guard<std::mutex> lock(pkt_queue_mutex_);
+            pkt_queue_.push(pkt);
+        }
+    }
+}
+
+}
+}
diff --git a/src/bin/perfdhcp/receiver.h b/src/bin/perfdhcp/receiver.h
new file mode 100644
index 0000000..2270948
--- /dev/null
+++ b/src/bin/perfdhcp/receiver.h
@@ -0,0 +1,103 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PERFDHCP_RECEIVER_H
+#define PERFDHCP_RECEIVER_H
+
+#include <perfdhcp/perf_socket.h>
+#include <perfdhcp/command_options.h>
+
+#include <dhcp/pkt.h>
+
+#include <queue>
+#include <thread>
+#include <mutex>
+#include <atomic>
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief A receiving DHCP packets class.
+///
+/// Receiver can be used in two modes: single-thread and multi-thread.
+///
+/// In single-thread mode the class directly reads packets from socket
+/// and returns them to consumer using getPkt method.
+///
+/// In case of multi-thread mode the class starts a thread in the background.
+/// The thread reads the packets and pushes them to pkt_queue_. Then
+/// in main thread packets can be consumed from the queue using getPkt
+/// method.
+class Receiver {
+private:
+    /// \brief Flag indicating if thread should run (true) or not (false).
+    std::atomic_flag run_flag_;
+
+    /// \brief Thread for receiving packets.
+    std::unique_ptr<std::thread> recv_thread_;
+
+    /// \brief Queue for passing packets from receiver thread to main thread.
+    std::queue<dhcp::PktPtr> pkt_queue_;
+
+    /// \brief Mutex for controlling access to the queue.
+    std::mutex pkt_queue_mutex_;
+
+    BasePerfSocket &socket_;
+
+    /// \brief Single- or thread-mode indicator.
+    bool single_threaded_;
+
+    uint8_t ip_version_;
+
+public:
+    /// \brief Receiver constructor.
+    ///
+    /// \param socket A socket for receiving packets.
+    /// \param single_threaded A flag indicating running mode.
+    /// \param ip_version An IP version: 4 or 6
+    Receiver(BasePerfSocket &socket, bool single_threaded, uint8_t ip_version) :
+        socket_(socket),
+        single_threaded_(single_threaded),
+        ip_version_(ip_version) {
+        run_flag_.clear();
+    }
+
+    /// \brief Destructor.
+    ~Receiver();
+
+    /// \brief Start a receiving thread in multi-thread mode.
+    ///
+    /// In single-thread mode it does nothing.
+    void start();
+
+    /// \brief Stop a receiving thread in multi-thread mode.
+    ///
+    /// In single-thread mode it does nothing.
+    void stop();
+
+    /// \brief Get DHCP packet.
+    ///
+    /// In single-thread mode it reads directly from the socket.
+    /// In multi-thread mode it reads packets from the queue.
+    dhcp::PktPtr getPkt();
+
+private:
+    /// \brief Receiving thread main function.
+    void run();
+
+    /// \brief Receive packets from sockets and pushes them to the queue.
+    ///
+    /// It runs in a loop until socket is empty.
+    void receivePackets();
+
+    /// \brief Read a packet directly from the socket.
+    dhcp::PktPtr readPktFromSocket();
+};
+
+}
+}
+
+#endif /* PERFDHCP_RECEIVER_H */
diff --git a/src/bin/perfdhcp/stats_mgr.cc b/src/bin/perfdhcp/stats_mgr.cc
new file mode 100644
index 0000000..1563588
--- /dev/null
+++ b/src/bin/perfdhcp/stats_mgr.cc
@@ -0,0 +1,473 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/duid.h>
+#include <dhcp/option6_iaaddr.h>
+#include <dhcp/option6_iaprefix.h>
+#include <dhcp/pkt4.h>
+#include <perfdhcp/stats_mgr.h>
+#include <perfdhcp/test_control.h>
+
+using isc::dhcp::DHO_DHCP_CLIENT_IDENTIFIER;
+using isc::dhcp::DUID;
+using isc::dhcp::Option6IAAddr;
+using isc::dhcp::Option6IAAddrPtr;
+using isc::dhcp::Option6IAPrefix;
+using isc::dhcp::Option6IAPrefixPtr;
+using isc::dhcp::OptionPtr;
+using isc::dhcp::Pkt4;
+using isc::dhcp::Pkt4Ptr;
+using isc::dhcp::PktPtr;
+
+namespace isc {
+namespace perfdhcp {
+
+int dhcpVersion(ExchangeType const exchange_type) {
+    switch (exchange_type) {
+    case ExchangeType::DO:
+    case ExchangeType::RA:
+    case ExchangeType::RNA:
+    case ExchangeType::RLA:
+        return 4;
+    case ExchangeType::SA:
+    case ExchangeType::RR:
+    case ExchangeType::RN:
+    case ExchangeType::RL:
+        return 6;
+    default:
+        isc_throw(BadValue,
+                  "unrecognized exchange type '" << exchange_type << "'");
+    }
+}
+
+std::ostream& operator<<(std::ostream& os, ExchangeType xchg_type)
+{
+    switch(xchg_type) {
+    case ExchangeType::DO:
+        return(os << "DISCOVER-OFFER");
+    case ExchangeType::RA:
+        return(os << "REQUEST-ACK");
+    case ExchangeType::RNA:
+        return(os << "REQUEST-ACK (renewal)");
+    case ExchangeType::RLA:
+        return(os << "RELEASE");
+    case ExchangeType::SA:
+        return(os << "SOLICIT-ADVERTISE");
+    case ExchangeType::RR:
+        return(os << "REQUEST-REPLY");
+    case ExchangeType::RN:
+        return(os << "RENEW-REPLY");
+    case ExchangeType::RL:
+        return(os << "RELEASE-REPLY");
+    default:
+        return(os << "Unknown exchange type");
+    }
+}
+
+
+ExchangeStats::ExchangeStats(const ExchangeType xchg_type,
+                             const double drop_time,
+                             const bool archive_enabled,
+                             const boost::posix_time::ptime boot_time)
+    : xchg_type_(xchg_type),
+      sent_packets_(),
+      rcvd_packets_(),
+      archived_packets_(),
+      archive_enabled_(archive_enabled),
+      drop_time_(drop_time),
+      min_delay_(std::numeric_limits<double>::max()),
+      max_delay_(0.),
+      sum_delay_(0.),
+      sum_delay_squared_(0.),
+      orphans_(0),
+      collected_(0),
+      unordered_lookup_size_sum_(0),
+      unordered_lookups_(0),
+      ordered_lookups_(0),
+      sent_packets_num_(0),
+      rcvd_packets_num_(0),
+      non_unique_addr_num_(0),
+      rejected_leases_num_(0),
+      boot_time_(boot_time)
+{
+    next_sent_ = sent_packets_.begin();
+}
+
+void
+ExchangeStats::updateDelays(const PktPtr& sent_packet,
+                            const PktPtr& rcvd_packet) {
+    if (!sent_packet) {
+        isc_throw(BadValue, "Sent packet is null");
+    }
+    if (!rcvd_packet) {
+        isc_throw(BadValue, "Received packet is null");
+    }
+
+    boost::posix_time::ptime sent_time = sent_packet->getTimestamp();
+    boost::posix_time::ptime rcvd_time = rcvd_packet->getTimestamp();
+
+    if (sent_time.is_not_a_date_time() ||
+        rcvd_time.is_not_a_date_time()) {
+        isc_throw(Unexpected,
+                  "Timestamp must be set for sent and "
+                  "received packet to measure RTT,"
+                  << " sent: " << sent_time
+                  << " recv: " << rcvd_time);
+    }
+    boost::posix_time::time_period period(sent_time, rcvd_time);
+    // We don't bother calculating deltas in nanoseconds. It is much
+    // more convenient to use seconds instead because we are going to
+    // sum them up.
+    double delta =
+        static_cast<double>(period.length().total_nanoseconds()) / 1e9;
+
+    if (delta < 0) {
+        isc_throw(Unexpected, "Sent packet's timestamp must not be "
+                  "greater than received packet's timestamp in "
+                  << xchg_type_ << ".\nTime difference: "
+                  << delta << ", sent: " << sent_time << ", rcvd: "
+                  << rcvd_time << ".\nTrans ID: " << sent_packet->getTransid()
+                  << ".");
+    }
+
+    // Record the minimum delay between sent and received packets.
+    if (delta < min_delay_) {
+        min_delay_ = delta;
+    }
+    // Record the maximum delay between sent and received packets.
+    if (delta > max_delay_) {
+        max_delay_ = delta;
+    }
+    // Update delay sum and square sum. That will be used to calculate
+    // mean delays.
+    sum_delay_ += delta;
+    sum_delay_squared_ += delta * delta;
+}
+
+PktPtr
+ExchangeStats::matchPackets(const PktPtr& rcvd_packet) {
+    using namespace boost::posix_time;
+
+    if (!rcvd_packet) {
+        isc_throw(BadValue, "Received packet is null");
+    }
+
+    if (sent_packets_.size() == 0) {
+        // List of sent packets is empty so there is no sense
+        // to continue looking fo the packet. It also means
+        // that the received packet we got has no corresponding
+        // sent packet so orphans counter has to be updated.
+        ++orphans_;
+        return(PktPtr());
+    } else if (next_sent_ == sent_packets_.end()) {
+        // Even if there are still many unmatched packets on the
+        // list we might hit the end of it because of unordered
+        // lookups. The next logical step is to reset iterator.
+        next_sent_ = sent_packets_.begin();
+    }
+
+    // With this variable we will be signalling success or failure
+    // to find the packet.
+    bool packet_found = false;
+    // Most likely responses are sent from the server in the same
+    // order as client's requests to the server. We are caching
+    // next sent packet and first try to match it with the next
+    // incoming packet. We are successful if there is no
+    // packet drop or out of order packets sent. This is actually
+    // the fastest way to look for packets.
+    if ((*next_sent_)->getTransid() == rcvd_packet->getTransid()) {
+        ++ordered_lookups_;
+        packet_found = true;
+    } else {
+        // If we are here, it means that we were unable to match the
+        // next incoming packet with next sent packet so we need to
+        // take a little more expensive approach to look packets using
+        // alternative index (transaction id & 1023).
+        PktListTransidHashIndex& idx = sent_packets_.template get<1>();
+        // Packets are grouped using transaction id masked with value
+        // of 1023. For instance, packets with transaction id equal to
+        // 1, 1024 ... will belong to the same group (a.k.a. bucket).
+        // When using alternative index we don't find the packet but
+        // bucket of packets and we need to iterate through the bucket
+        // to find the one that has desired transaction id.
+        std::pair<PktListTransidHashIterator,PktListTransidHashIterator> p =
+            idx.equal_range(hashTransid(rcvd_packet));
+        // We want to keep statistics of unordered lookups to make
+        // sure that there is a right balance between number of
+        // unordered lookups and ordered lookups. If number of unordered
+        // lookups is high it may mean that many packets are lost or
+        // sent out of order.
+        ++unordered_lookups_;
+        // We also want to keep the mean value of the bucket. The lower
+        // bucket size the better. If bucket sizes appear to big we
+        // might want to increase number of buckets.
+        unordered_lookup_size_sum_ += std::distance(p.first, p.second);
+        bool non_expired_found = false;
+        // Removal can be done only after the loop
+        PktListRemovalQueue to_remove;
+        for (PktListTransidHashIterator it = p.first; it != p.second; ++it) {
+            // If transaction id is matching, we found the original
+            // packet sent to the server. Therefore, we reset the
+            // 'next sent' pointer to point to this location. We
+            // also indicate that the matching packet is found.
+            // Even though the packet has been found, we continue
+            // iterating over the bucket to remove all those packets
+            // that are timed out.
+            if (!packet_found && ((*it)->getTransid() == rcvd_packet->getTransid())) {
+                packet_found = true;
+                next_sent_ = sent_packets_.template project<0>(it);
+            }
+
+            if (!non_expired_found) {
+                // Check if the packet should be removed due to timeout.
+                // This includes the packet matching the received one.
+                ptime now = microsec_clock::universal_time();
+                ptime packet_time = (*it)->getTimestamp();
+                time_period packet_period(packet_time, now);
+                if (!packet_period.is_null()) {
+                    double period_fractional =
+                        packet_period.length().total_seconds() +
+                        (static_cast<double>(packet_period.length().fractional_seconds())
+                         / packet_period.length().ticks_per_second());
+                    if (drop_time_ > 0 && (period_fractional > drop_time_)) {
+                        // Push the iterator on the removal queue.
+                        to_remove.push(it);
+
+                    } else {
+                        // We found first non-expired transaction. All other
+                        // transactions within this bucket are considered
+                        // non-expired because packets are held in the
+                        // order of addition within the bucket.
+                        non_expired_found = true;
+                    }
+                }
+            }
+
+            // If we found the packet and all expired transactions,
+            // there is nothing more to do.
+            if (non_expired_found && packet_found) {
+                break;
+            }
+        }
+
+        // Deal with the removal queue.
+        while (!to_remove.empty()) {
+            PktListTransidHashIterator it = to_remove.front();
+            to_remove.pop();
+            // If timed out packet is not the one matching server response,
+            // we simply remove it and keep the pointer to the 'next sent'
+            // packet as it was. If the timed out packet appears to be the
+            // one that is matching the server response, we still want to
+            // remove it, but we need to update the 'next sent' pointer to
+            // point to a valid location.
+            if (sent_packets_.template project<0>(it) != next_sent_) {
+                eraseSent(sent_packets_.template project<0>(it));
+            } else {
+                next_sent_ = eraseSent(sent_packets_.template project<0>(it));
+                // We removed the matching packet because of the timeout. It
+                // means that there is no match anymore.
+                packet_found = false;
+            }
+            ++collected_;
+        }
+    }
+
+    if (!packet_found) {
+        // If we are here, it means that both ordered lookup and
+        // unordered lookup failed. Searched packet is not on the list.
+        ++orphans_;
+        return(PktPtr());
+    }
+
+    // Packet is matched so we count it. We don't count unmatched packets
+    // as they are counted as orphans with a separate counter.
+    ++rcvd_packets_num_;
+    PktPtr sent_packet(*next_sent_);
+    // If packet was found, we assume it will be never searched
+    // again. We want to delete this packet from the list to
+    // improve performance of future searches.
+    next_sent_ = eraseSent(next_sent_);
+    return(sent_packet);
+}
+
+
+void
+ExchangeStats::printTimestamps() {
+    // If archive mode is disabled there is no sense to proceed
+    // because we don't have packets and their timestamps.
+    if (!archive_enabled_) {
+        isc_throw(isc::InvalidOperation,
+                  "packets archive mode is disabled");
+    }
+    if (rcvd_packets_num_ == 0) {
+        std::cout << "Unavailable! No packets received." << std::endl;
+    }
+    // We will be using boost::posix_time extensively here
+    using namespace boost::posix_time;
+
+    // Iterate through all received packets.
+    for (PktListIterator it = rcvd_packets_.begin();
+         it != rcvd_packets_.end();
+         ++it) {
+        PktPtr rcvd_packet = *it;
+        PktListTransidHashIndex& idx =
+            archived_packets_.template get<1>();
+        std::pair<PktListTransidHashIterator,
+                  PktListTransidHashIterator> p =
+            idx.equal_range(hashTransid(rcvd_packet));
+        for (PktListTransidHashIterator it_archived = p.first;
+             it_archived != p.second;
+             ++it_archived) {
+            if ((*it_archived)->getTransid() ==
+                rcvd_packet->getTransid()) {
+                PktPtr sent_packet = *it_archived;
+                // Get sent and received packet times.
+                ptime sent_time = sent_packet->getTimestamp();
+                ptime rcvd_time = rcvd_packet->getTimestamp();
+                // All sent and received packets should have timestamps
+                // set but if there is a bug somewhere and packet does
+                // not have timestamp we want to catch this here.
+                if (sent_time.is_not_a_date_time() ||
+                    rcvd_time.is_not_a_date_time()) {
+                    isc_throw(InvalidOperation,
+                              "packet time is not set");
+                }
+                // Calculate durations of packets from beginning of epoch.
+                time_period sent_period(boot_time_, sent_time);
+                time_period rcvd_period(boot_time_, rcvd_time);
+                // Print timestamps for sent and received packet.
+                std::cout << "sent / received: "
+                          << to_iso_string(sent_period.length())
+                          << " / "
+                          << to_iso_string(rcvd_period.length())
+                          << std::endl;
+                break;
+            }
+        }
+    }
+}
+
+StatsMgr::StatsMgr(CommandOptions& options) :
+    exchanges_(),
+    boot_time_(boost::posix_time::microsec_clock::universal_time())
+{
+    // Check if packet archive mode is required. If user
+    // requested diagnostics option -x l or -x t we have to enable
+    // it so as StatsMgr preserves all packets.
+    archive_enabled_ = options.testDiags('l') || options.testDiags('t');
+
+    if (options.getIpVersion() == 4) {
+        addExchangeStats(ExchangeType::DO, options.getDropTime()[0]);
+        if (options.getExchangeMode() == CommandOptions::DORA_SARR) {
+            addExchangeStats(ExchangeType::RA, options.getDropTime()[1]);
+        }
+        if (options.getRenewRate() != 0) {
+            addExchangeStats(ExchangeType::RNA);
+        }
+        if (options.getReleaseRate() != 0) {
+            addExchangeStats(ExchangeType::RLA);
+        }
+    } else if (options.getIpVersion() == 6) {
+        addExchangeStats(ExchangeType::SA, options.getDropTime()[0]);
+        if (options.getExchangeMode() == CommandOptions::DORA_SARR) {
+            addExchangeStats(ExchangeType::RR, options.getDropTime()[1]);
+        }
+        if (options.getRenewRate() != 0) {
+            addExchangeStats(ExchangeType::RN);
+        }
+        if (options.getReleaseRate() != 0) {
+            addExchangeStats(ExchangeType::RL);
+        }
+    }
+    if (options.testDiags('i')) {
+        addCustomCounter("shortwait", "Short waits for packets");
+    }
+}
+
+std::string
+ExchangeStats::receivedLeases() const {
+    // Get DHCP version.
+    int const v(dhcpVersion(xchg_type_));
+
+    std::stringstream result;
+    // Iterate through all received packets.
+    for (PktPtr const& packet : rcvd_packets_) {
+
+        // Get client identifier.
+        if (v == 4) {
+            OptionPtr const& client_id_option(
+                packet->getOption(DHO_DHCP_CLIENT_IDENTIFIER));
+            if (client_id_option) {
+                result << TestControl::vector2Hex(client_id_option->getData());
+            }
+        } else if (v == 6) {
+            OptionPtr const& client_id_option(packet->getOption(D6O_CLIENTID));
+            if (client_id_option) {
+                result << DUID(client_id_option->getData()).toText();
+            }
+        } else {
+            isc_throw(BadValue, "unrecognized DHCP version '" << v << "'");
+        }
+        result << ',';
+
+        // Get address.
+        if (v == 4) {
+            Pkt4Ptr const& packet4(boost::dynamic_pointer_cast<Pkt4>(packet));
+            if (packet4) {
+                result << packet4->getYiaddr().toText();
+            }
+        } else if (v == 6) {
+            OptionPtr const& option(packet->getOption(D6O_IA_NA));
+            if (option) {
+                Option6IAAddrPtr const& iaaddr(
+                    boost::dynamic_pointer_cast<Option6IAAddr>(
+                        option->getOption(D6O_IAADDR)));
+                if (iaaddr) {
+                    result << iaaddr->getAddress().toText();
+                }
+            }
+        }
+        result << ',';
+
+        // Get prefix.
+        OptionPtr const& option(packet->getOption(D6O_IA_PD));
+        if (option) {
+            Option6IAPrefixPtr const& iaprefix(
+                boost::dynamic_pointer_cast<Option6IAPrefix>(
+                    option->getOption(D6O_IAPREFIX)));
+            if (iaprefix) {
+                result << iaprefix->getAddress().toText();
+            }
+        }
+
+        result << std::endl;
+    }
+
+    return result.str();
+}
+
+void
+ExchangeStats::printLeases() const {
+    std::cout << receivedLeases() << std::endl;
+}
+
+void StatsMgr::printLeases() const {
+    for (auto const& exchange : exchanges_) {
+        std::cout << "***Leases for " << exchange.first << "***" << std::endl;
+        std::cout << "client_id,adrress,prefix" << std::endl;
+        exchange.second->printLeases();
+        std::cout << std::endl;
+    }
+}
+
+int ExchangeStats::malformed_pkts_{0};
+
+}  // namespace perfdhcp
+}  // namespace isc
diff --git a/src/bin/perfdhcp/stats_mgr.h b/src/bin/perfdhcp/stats_mgr.h
new file mode 100644
index 0000000..39718e9
--- /dev/null
+++ b/src/bin/perfdhcp/stats_mgr.h
@@ -0,0 +1,1258 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef STATS_MGR_H
+#define STATS_MGR_H
+
+#include <dhcp/pkt.h>
+#include <exceptions/exceptions.h>
+#include <perfdhcp/command_options.h>
+
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+#include <boost/multi_index/sequenced_index.hpp>
+#include <boost/multi_index/global_fun.hpp>
+#include <boost/multi_index/mem_fun.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+#include <iostream>
+#include <map>
+#include <queue>
+
+
+namespace isc {
+namespace perfdhcp {
+
+/// DHCP packet exchange types.
+enum class ExchangeType {
+    DO,  ///< DHCPv4 DISCOVER-OFFER
+    RA,  ///< DHCPv4 REQUEST-ACK
+    RNA, ///< DHCPv4 REQUEST-ACK (renewal)
+    RLA, ///< DHCPv4 RELEASE
+    SA,  ///< DHCPv6 SOLICIT-ADVERTISE
+    RR,  ///< DHCPv6 REQUEST-REPLY
+    RN,  ///< DHCPv6 RENEW-REPLY
+    RL   ///< DHCPv6 RELEASE-REPLY
+};
+
+/// \brief Get the DHCP version that fits the exchange type.
+///
+/// \param exchange_type exchange type that will determine the version
+/// \throw isc::BadValue exchange type is unrecognized
+/// \return DHCP version: 4 or 6
+int dhcpVersion(ExchangeType const exchange_type);
+
+/// \brief Return name of the exchange.
+///
+/// Function returns name of the specified exchange type.
+/// This function is mainly for logging purposes.
+///
+/// \param os output stream to use.
+/// \param xchg_type exchange type.
+/// \return string representing name of the exchange.
+std::ostream& operator<<(std::ostream& os, ExchangeType xchg_type);
+
+/// \brief Custom Counter
+///
+/// This class represents custom statistics counters. Client class
+/// may create unlimited number of counters. Such counters are
+/// being stored in map in Statistics Manager and access using
+/// unique string key.
+class CustomCounter {
+public:
+    /// \brief Constructor.
+    ///
+    /// This constructor sets counter name. This name is used in
+    /// log file to report value of each counter.
+    ///
+    /// \param name name of the counter used in log file.
+    CustomCounter(const std::string& name) :
+        counter_(0),
+        name_(name) {
+    }
+
+    /// \brief Increment operator.
+    const CustomCounter& operator++() {
+        ++counter_;
+        return (*this);
+    }
+
+    /// \brief Increment operator.
+    const CustomCounter& operator++(int) {
+        CustomCounter& this_counter(*this);
+        operator++();
+        return (this_counter);
+    }
+
+    const CustomCounter& operator+=(int val) {
+        counter_ += val;
+        return (*this);
+    }
+
+    /// \brief Return counter value.
+    ///
+    /// Method returns counter value.
+    ///
+    /// \return counter value.
+    uint64_t getValue() const {
+        return (counter_);
+    }
+
+    /// \brief Return counter name.
+    ///
+    /// Method returns counter name.
+    ///
+    /// \return counter name.
+    const std::string& getName() const {
+        return (name_);
+    }
+
+private:
+    /// \brief Default constructor.
+    ///
+    /// Default constructor is private because we don't want client
+    /// class to call it because we want client class to specify
+    /// counter's name.
+    CustomCounter() : counter_(0) {
+    }
+
+    uint64_t counter_;  ///< Counter's value.
+    std::string name_;  ///< Counter's name.
+};
+
+typedef typename boost::shared_ptr<CustomCounter> CustomCounterPtr;
+
+/// Map containing custom counters.
+typedef typename std::map<std::string, CustomCounterPtr> CustomCountersMap;
+
+/// Iterator for \ref CustomCountersMap.
+typedef typename CustomCountersMap::const_iterator CustomCountersMapIterator;
+
+
+/// \brief Exchange Statistics.
+///
+/// This class collects statistics for exchanges. Parent class
+/// may define number of different packet exchanges like:
+/// DHCPv4 DISCOVER-OFFER, DHCPv6 SOLICIT-ADVERTISE etc. Performance
+/// statistics will be collected for each of those separately in
+/// corresponding instance of ExchangeStats.
+class ExchangeStats {
+public:
+
+    /// \brief Hash transaction id of the packet.
+    ///
+    /// Function hashes transaction id of the packet. Hashing is
+    /// non-unique. Many packets may have the same hash value and thus
+    /// they belong to the same packet buckets. Packet buckets are
+    /// used for unordered packets search with multi index container.
+    ///
+    /// \param packet packet which transaction id is to be hashed.
+    /// \throw isc::BadValue if packet is null.
+    /// \return transaction id hash.
+    static uint32_t hashTransid(const dhcp::PktPtr& packet) {
+        if (!packet) {
+            isc_throw(BadValue, "Packet is null");
+        }
+        return(packet->getTransid() & 1023);
+    }
+
+    /// \brief List of packets (sent or received).
+    ///
+    /// List of packets based on multi index container allows efficient
+    /// search of packets based on their sequence (order in which they
+    /// were inserted) as well as based on their hashed transaction id.
+    /// The first index (sequenced) provides the way to use container
+    /// as a regular list (including iterators, removal of elements from
+    /// the middle of the collection etc.). This index is meant to be used
+    /// more frequently than the latter one and it is based on the
+    /// assumption that responses from the DHCP server are received in
+    /// order. In this case, when next packet is received it can be
+    /// matched with next packet on the list of sent packets. This
+    /// prevents intensive searches on the list of sent packets every
+    /// time new packet arrives. In many cases however packets can be
+    /// dropped by the server or may be sent out of order and we still
+    ///  want to have ability to search packets using transaction id.
+    /// The second index can be used for this purpose. This index is
+    /// hashing transaction ids using custom function \ref hashTransid.
+    /// Note that other possibility would be to simply specify index
+    /// that uses transaction id directly (instead of hashing with
+    /// \ref hashTransid). In this case however we have chosen to use
+    /// hashing function because it shortens the index size to just
+    /// 1023 values maximum. Search operation on this index generally
+    /// returns the range of packets that have the same transaction id
+    /// hash assigned but most often these ranges will be short so further
+    /// search within a range to find a packet with particular transaction
+    /// id will not be intensive.
+    ///
+    /// Example 1: Add elements to the list
+    /// \code
+    /// PktList packets_collection();
+    /// boost::shared_ptr<Pkt4> pkt1(new Pkt4(...));
+    /// boost::shared_ptr<Pkt4> pkt2(new Pkt4(...));
+    /// // Add new packet to the container, it will be available through
+    /// // both indexes
+    /// static_cast<void>(packets_collection.push_back(pkt1));
+    /// // Here is another way to add packet to the container. The result
+    /// // is exactly the same as previously.
+    /// static_cast<void>(packets_collection.template get<0>().push_back(pkt2));
+    /// \endcode
+    ///
+    /// @note The multi index has no unique index so insertion should never
+    /// fail and there is no need to check the return of push_back().
+    ///
+    /// Example 2: Access elements through sequential index
+    /// \code
+    /// PktList packets_collection();
+    /// ...  # Add elements to the container
+    /// for (PktListIterator it = packets_collection.begin();
+    ///      it != packets_collection.end();
+    ///      ++it) {
+    ///          boost::shared_ptr<Pkt4> pkt = *it;
+    ///          # Do something with packet;
+    ///      }
+    /// \endcode
+    ///
+    /// Example 3: Access elements through ordered index by hash
+    /// \code
+    /// // Get the instance of the second search index.
+    /// PktListTransidHashIndex& idx = sent_packets_.template get<1>();
+    /// // Get the range (bucket) of packets sharing the same transaction
+    /// // id hash.
+    /// std::pair<PktListTransidHashIterator,PktListTransidHashIterator> p =
+    ///     idx.equal_range(hashTransid(rcvd_packet));
+    /// // Iterate through the returned bucket.
+    /// for (PktListTransidHashIterator it = p.first; it != p.second;
+    ///     ++it) {
+    ///    boost::shared_ptr pkt = *it;
+    ///    ... # Do something with the packet (e.g. check transaction id)
+    /// }
+    /// \endcode
+    typedef boost::multi_index_container<
+        // Container holds PktPtr objects.
+        dhcp::PktPtr,
+        // List container indexes.
+        boost::multi_index::indexed_by<
+            // Sequenced index provides the way to use this container
+            // in the same way as std::list.
+            boost::multi_index::sequenced<>,
+            // The other index keeps products of transaction id.
+            // Elements with the same hash value are grouped together
+            // into buckets and transactions are ordered from the
+            // oldest to latest within a bucket.
+            boost::multi_index::ordered_non_unique<
+                // Specify hash function to get the product of
+                // transaction id. This product is obtained by calling
+                // hashTransid() function.
+                boost::multi_index::global_fun<
+                    // Hashing function takes PktPtr as argument.
+                    const dhcp::PktPtr&,
+                    // ... and returns uint32 value.
+                    uint32_t,
+                    // ... and here is a reference to it.
+                    &ExchangeStats::hashTransid
+                    >
+                >
+            >
+        > PktList;
+
+    /// Packet list iterator for sequential access to elements.
+    typedef typename PktList::iterator PktListIterator;
+    /// Packet list index to search packets using transaction id hash.
+    typedef typename PktList::template nth_index<1>::type
+    PktListTransidHashIndex;
+    /// Packet list iterator to access packets using transaction id hash.
+    typedef typename PktListTransidHashIndex::const_iterator
+    PktListTransidHashIterator;
+    /// Packet list iterator queue for removal.
+    typedef typename std::queue<PktListTransidHashIterator>
+    PktListRemovalQueue;
+
+    /// \brief Constructor
+    ///
+    /// \param xchg_type exchange type
+    /// \param drop_time maximum time elapsed before packet is
+    /// assumed dropped. Negative value disables it.
+    /// \param archive_enabled if true packets archive mode is enabled.
+    /// In this mode all packets are stored throughout the test execution.
+    /// \param boot_time Holds the timestamp when perfdhcp has been started.
+    ExchangeStats(const ExchangeType xchg_type,
+                  const double drop_time,
+                  const bool archive_enabled,
+                  const boost::posix_time::ptime boot_time);
+
+    /// \brief Add new packet to list of sent packets.
+    ///
+    /// Method adds new packet to list of sent packets.
+    ///
+    /// \param packet packet object to be added.
+    /// \throw isc::BadValue if packet is null.
+    void appendSent(const dhcp::PktPtr& packet) {
+        if (!packet) {
+            isc_throw(BadValue, "Packet is null");
+        }
+        static_cast<void>(sent_packets_.template get<0>().push_back(packet));
+        ++sent_packets_num_;
+    }
+
+    /// \brief Add new packet to list of received packets.
+    ///
+    /// Method adds new packet to list of received packets.
+    ///
+    /// \param packet packet object to be added.
+    /// \throw isc::BadValue if packet is null.
+    void appendRcvd(const dhcp::PktPtr& packet) {
+        if (!packet) {
+            isc_throw(BadValue, "Packet is null");
+        }
+        static_cast<void>(rcvd_packets_.push_back(packet));
+    }
+
+    ///  \brief Update delay counters.
+    ///
+    /// Method updates delay counters based on timestamps of
+    /// sent and received packets.
+    ///
+    /// \param sent_packet sent packet
+    /// \param rcvd_packet received packet
+    /// \throw isc::BadValue if sent or received packet is null.
+    /// \throw isc::Unexpected if failed to calculate timestamps
+    void updateDelays(const dhcp::PktPtr& sent_packet,
+                      const dhcp::PktPtr& rcvd_packet);
+
+    /// \brief Match received packet with the corresponding sent packet.
+    ///
+    /// Method finds packet with specified transaction id on the list
+    /// of sent packets. It is used to match received packet with
+    /// corresponding sent packet.
+    /// Since packets from the server most often come in the same order
+    /// as they were sent by client, this method will first check if
+    /// next sent packet matches. If it doesn't, function will search
+    /// the packet using indexing by transaction id. This reduces
+    /// packet search time significantly.
+    ///
+    /// \param rcvd_packet received packet to be matched with sent packet.
+    /// \throw isc::BadValue if received packet is null.
+    /// \return packet having specified transaction or NULL if packet
+    /// not found
+    dhcp::PktPtr matchPackets(const dhcp::PktPtr& rcvd_packet);
+
+    /// \brief Return minimum delay between sent and received packet.
+    ///
+    /// Method returns minimum delay between sent and received packet.
+    ///
+    /// \return minimum delay between packets.
+    double getMinDelay() const { return(min_delay_); }
+
+    /// \brief Return maximum delay between sent and received packet.
+    ///
+    /// Method returns maximum delay between sent and received packet.
+    ///
+    /// \return maximum delay between packets.
+    double getMaxDelay() const { return(max_delay_); }
+
+    /// \brief Return average packet delay.
+    ///
+    /// Method returns average packet delay. If no packets have been
+    /// received for this exchange avg delay can't be calculated and
+    /// thus method throws exception.
+    ///
+    /// \throw isc::InvalidOperation if no packets for this exchange
+    /// have been received yet.
+    /// \return average packet delay.
+    double getAvgDelay() const {
+        if (rcvd_packets_num_  == 0) {
+            isc_throw(InvalidOperation, "no packets received");
+        }
+        return(sum_delay_ / rcvd_packets_num_);
+    }
+
+    /// \brief Return standard deviation of packet delay.
+    ///
+    /// Method returns standard deviation of packet delay. If no
+    /// packets have been received for this exchange, the standard
+    /// deviation can't be calculated and thus method throws
+    /// exception.
+    ///
+    /// \throw isc::InvalidOperation if number of received packets
+    /// for the exchange is equal to zero.
+    /// \return standard deviation of packet delay.
+    double getStdDevDelay() const {
+        if (rcvd_packets_num_ == 0) {
+            isc_throw(InvalidOperation, "no packets received");
+        }
+        return(sqrt(sum_delay_squared_ / rcvd_packets_num_ -
+                    getAvgDelay() * getAvgDelay()));
+    }
+
+    /// \brief Return number of orphan packets.
+    ///
+    /// Method returns number of received packets that had no matching
+    /// sent packet. It is possible that such packet was late or not
+    /// for us.
+    ///
+    /// \return number of orphan received packets.
+    uint64_t getOrphans() const { return(orphans_); }
+
+    /// \brief Return number of garbage collected packets.
+    ///
+    /// Method returns number of garbage collected timed out
+    /// packets. Packet is assumed timed out when duration
+    /// between sending it to server and receiving server's
+    /// response is greater than value specified with -d<value>
+    /// command line argument.
+    ///
+    /// \return number of garbage collected packets.
+    uint64_t getCollectedNum() const { return(collected_); }
+
+    /// \brief Return average unordered lookup set size.
+    ///
+    /// Method returns average unordered lookup set size.
+    /// This value changes every time \ref ExchangeStats::matchPackets
+    /// function performs unordered packet lookup.
+    ///
+    /// \throw isc::InvalidOperation if there have been no unordered
+    /// lookups yet.
+    /// \return average unordered lookup set size.
+    double getAvgUnorderedLookupSetSize() const {
+        if (unordered_lookups_ == 0) {
+            isc_throw(InvalidOperation, "no unordered lookups");
+        }
+        return(static_cast<double>(unordered_lookup_size_sum_) /
+               static_cast<double>(unordered_lookups_));
+    }
+
+    /// \brief Return number of unordered sent packets lookups.
+    ///
+    /// Method returns number of unordered sent packet lookups.
+    /// Unordered lookup is used when received packet was sent
+    /// out of order by server - transaction id of received
+    /// packet does not match transaction id of next sent packet.
+    ///
+    /// \return number of unordered lookups.
+    uint64_t getUnorderedLookups() const { return(unordered_lookups_); }
+
+    /// \brief Return number of ordered sent packets lookups.
+    ///
+    /// Method returns number of ordered sent packet lookups.
+    /// Ordered lookup is used when packets are received in the
+    /// same order as they were sent to the server.
+    /// If packets are skipped or received out of order, lookup
+    /// function will use unordered lookup (with hash table).
+    ///
+    /// \return number of ordered lookups.
+    uint64_t getOrderedLookups() const { return(ordered_lookups_); }
+
+    /// \brief Return total number of sent packets.
+    ///
+    /// Method returns total number of sent packets.
+    ///
+    /// \return number of sent packets.
+    uint64_t getSentPacketsNum() const { return(sent_packets_num_); }
+
+    /// \brief Return total number of received packets.
+    ///
+    /// Method returns total number of received packets.
+    ///
+    /// \return number of received packets.
+    uint64_t getRcvdPacketsNum() const { return(rcvd_packets_num_); }
+
+    /// \brief Return number of dropped packets.
+    ///
+    /// Method returns number of dropped packets.
+    ///
+    /// \return number of dropped packets.
+    uint64_t getDroppedPacketsNum() const {
+        uint64_t drops = 0;
+        if (getSentPacketsNum() > getRcvdPacketsNum()) {
+            drops = getSentPacketsNum() - getRcvdPacketsNum();
+        }
+        return(drops);
+    }
+
+    /// \brief Return total number of rejected leases.
+    ///
+    /// Method returns total number of rejected leases.
+    ///
+    /// \return number of rejected leases.
+    uint64_t getRejLeasesNum() const { return(rejected_leases_num_); }
+
+    /// \brief Return total number of non unique addresses.
+    ///
+    /// Method returns total number of non unique addresses.
+    ///
+    /// \return number of non unique addresses.
+    uint64_t getNonUniqueAddrNum() const { return(non_unique_addr_num_); }
+
+    /// \brief Increase number of rejected leases.
+    ///
+    /// Method increases total number of rejected leases by one.
+    void updateRejLeases() { ++rejected_leases_num_; }
+
+    /// \brief Increase number of non unique addresses.
+    ///
+    /// Method increases total number of non unique addresses by one.
+    void updateNonUniqueAddr() { ++non_unique_addr_num_; }
+
+    /// \brief Print main statistics for packet exchange.
+    ///
+    /// Method prints main statistics for particular exchange.
+    /// Statistics includes: number of sent and received packets,
+    /// number of dropped packets and number of orphans.
+    ///
+    /// \todo Currently the number of orphans is not displayed because
+    /// Reply messages received for Renew and Releases are counted as
+    /// orphans for the 4-way exchanges, which is wrong. We will need to
+    /// move the orphans counting out of the Statistics Manager so as
+    /// orphans counter is increased only if the particular message is
+    /// not identified as a response to any of the messages sent by
+    /// perfdhcp.
+    void printMainStats() const {
+        using namespace std;
+        auto sent = getSentPacketsNum();
+        auto drops = getDroppedPacketsNum();
+        double drops_ratio = 100.0 * static_cast<double>(drops) / static_cast<double>(sent);
+
+        cout << "sent packets: " << sent << endl
+             << "received packets: " << getRcvdPacketsNum() << endl
+             << "drops: " << drops << endl
+             << "drops ratio: " << drops_ratio << " %" << endl
+             << "orphans: " << getOrphans() << endl
+             << "rejected leases: " << getRejLeasesNum() << endl
+             << "non unique addresses: " << getNonUniqueAddrNum() << endl;
+    }
+
+    /// \brief Print round trip time packets statistics.
+    ///
+    /// Method prints round trip time packets statistics. Statistics
+    /// includes minimum packet delay, maximum packet delay, average
+    /// packet delay and standard deviation of delays. Packet delay
+    /// is a duration between sending a packet to server and receiving
+    /// response from server.
+    void printRTTStats() const {
+        using namespace std;
+        try {
+            cout << fixed << setprecision(3)
+                 << "min delay: " << getMinDelay() * 1e3 << " ms" << endl
+                 << "avg delay: " << getAvgDelay() * 1e3 << " ms" << endl
+                 << "max delay: " << getMaxDelay() * 1e3 << " ms" << endl
+                 << "std deviation: " << getStdDevDelay() * 1e3 << " ms"
+                 << endl
+                 << "collected packets: " << getCollectedNum() << endl;
+        } catch (const Exception&) {
+            // repeated output for easier automated parsing
+            cout << "min delay: n/a" << endl
+                 << "avg delay: n/a" << endl
+                 << "max delay: n/a" << endl
+                 << "std deviation: n/a" << endl
+                 << "collected packets: 0" << endl;
+        }
+    }
+
+    //// \brief Print timestamps for sent and received packets.
+    ///
+    /// Method prints timestamps for all sent and received packets for
+    /// packet exchange. In order to run this method the packets
+    /// archiving mode has to be enabled during object constructions.
+    /// Otherwise sent packets are not stored during tests execution
+    /// and this method has no ability to get and print their timestamps.
+    ///
+    /// \throw isc::InvalidOperation if found packet with no timestamp or
+    /// if packets archive mode is disabled.
+    void printTimestamps();
+
+    std::tuple<PktListIterator, PktListIterator> getSentPackets() {
+        return(std::make_tuple(sent_packets_.begin(), sent_packets_.end()));
+    }
+
+    /// \brief Return the list of received leases in CSV format as string.
+    ///
+    /// Depending exchange type, it can apply to
+    /// potential leases received in offers and advertisements,
+    /// committed leases received in acknowledgements and replies,
+    /// renewed or released leases.
+    ///
+    /// \return multiline string of received leases in CSV format
+    std::string receivedLeases() const;
+
+    /// \brief Print the list of received leases.
+    void printLeases() const;
+
+    static int malformed_pkts_;
+
+// Private stuff of ExchangeStats class
+private:
+
+    /// \brief Private default constructor.
+    ///
+    /// Default constructor is private because we want the client
+    /// class to specify exchange type explicitly.
+    ExchangeStats();
+
+    /// \brief Erase packet from the list of sent packets.
+    ///
+    /// Method erases packet from the list of sent packets.
+    ///
+    /// \param it iterator pointing to packet to be erased.
+    /// \return iterator pointing to packet following erased
+    /// packet or sent_packets_.end() if packet not found.
+    PktListIterator eraseSent(const PktListIterator it) {
+        if (archive_enabled_) {
+            // We don't want to keep list of all sent packets
+            // because it will affect packet lookup performance.
+            // If packet is matched with received packet we
+            // move it to list of archived packets. List of
+            // archived packets may be used for diagnostics
+            // when test is completed.
+            static_cast<void>(archived_packets_.push_back(*it));
+        }
+        // get<0>() template returns sequential index to
+        // container.
+        return(sent_packets_.template get<0>().erase(it));
+    }
+
+    ExchangeType xchg_type_;             ///< Packet exchange type.
+    PktList sent_packets_;               ///< List of sent packets.
+
+    /// Iterator pointing to the packet on sent list which will most
+    /// likely match next received packet. This is based on the
+    /// assumption that server responds in order to incoming packets.
+    PktListIterator next_sent_;
+
+    PktList rcvd_packets_;         ///< List of received packets.
+
+    /// List of archived packets. All sent packets that have
+    /// been matched with received packet are moved to this
+    /// list for diagnostics purposes.
+    PktList archived_packets_;
+
+    /// Indicates all packets have to be preserved after matching.
+    /// By default this is disabled which means that when received
+    /// packet is matched with sent packet both are deleted. This
+    /// is important when test is executed for extended period of
+    /// time and high memory usage might be the issue.
+    /// When timestamps listing is specified from the command line
+    /// (using diagnostics selector), all packets have to be preserved
+    /// so as the printing method may read their timestamps and
+    /// print it to user. In such usage model it will be rare to
+    /// run test for extended period of time so it should be fine
+    /// to keep all packets archived throughout the test.
+    bool archive_enabled_;
+
+    /// Maximum time elapsed between sending and receiving packet
+    /// before packet is assumed dropped.
+    double drop_time_;
+
+    double min_delay_;             ///< Minimum delay between sent
+                                   ///< and received packets.
+    double max_delay_;             ///< Maximum delay between sent
+                                   ///< and received packets.
+    double sum_delay_;             ///< Sum of delays between sent
+                                   ///< and received packets.
+    double sum_delay_squared_;     ///< Squared sum of delays between
+                                   ///< sent and received packets.
+
+    uint64_t orphans_;   ///< Number of orphan received packets.
+
+    uint64_t collected_; ///< Number of garbage collected packets.
+
+    /// Sum of unordered lookup sets. Needed to calculate mean size of
+    /// lookup set. It is desired that number of unordered lookups is
+    /// minimal for performance reasons. Tracking number of lookups and
+    /// mean size of the lookup set should give idea of packets search
+    /// complexity.
+    uint64_t unordered_lookup_size_sum_;
+
+    uint64_t unordered_lookups_;   ///< Number of unordered sent packets
+                                   ///< lookups.
+    uint64_t ordered_lookups_;     ///< Number of ordered sent packets
+                                   ///< lookups.
+
+    uint64_t sent_packets_num_;    ///< Total number of sent packets.
+    uint64_t rcvd_packets_num_;    ///< Total number of received packets.
+
+    uint64_t non_unique_addr_num_; ///< Total number of non unique addresses
+                                   ///< offered/advertised.
+    uint64_t rejected_leases_num_; ///< Total number of rejected leases
+                                   /// (e.g. NoAddrAvail)
+    boost::posix_time::ptime boot_time_; ///< Time when test is started.
+};
+
+/// Pointer to ExchangeStats.
+typedef boost::shared_ptr<ExchangeStats> ExchangeStatsPtr;
+
+/// Map containing all specified exchange types.
+typedef typename std::map<ExchangeType, ExchangeStatsPtr> ExchangesMap;
+
+/// Iterator pointing to \ref ExchangesMap.
+typedef typename ExchangesMap::const_iterator ExchangesMapIterator;
+
+
+/// \brief Statistics Manager
+///
+/// This class template is a storage for various performance statistics
+/// collected during performance tests execution with perfdhcp tool.
+///
+/// Statistics Manager holds lists of sent and received packets and
+/// groups them into exchanges. For example: DHCPDISCOVER message and
+/// corresponding DHCPOFFER messages belong to one exchange, DHCPREQUEST
+/// and corresponding DHCPACK message belong to another exchange etc.
+/// In order to update statistics for a particular exchange type, client
+/// class passes sent and received packets. Internally, Statistics Manager
+/// tries to match transaction id of received packet with sent packet
+/// stored on the list of sent packets. When packets are matched the
+/// round trip time can be calculated.
+///
+class StatsMgr : public boost::noncopyable {
+public:
+    /// \brief Constructor.
+    ///
+    /// This constructor by default disables packets archiving mode.
+    /// In this mode all packets from the list of sent packets are
+    /// moved to list of archived packets once they have been matched
+    /// with received packets. This is required if it has been selected
+    /// from the command line to print timestamps for all packets after
+    /// the test. If this is not selected archiving should be disabled
+    /// for performance reasons and to avoid waste of memory for storing
+    /// large list of archived packets.
+    StatsMgr(CommandOptions& options);
+
+    /// \brief Specify new exchange type.
+    ///
+    /// This method creates new \ref ExchangeStats object that will
+    /// collect statistics data from packets exchange of the specified
+    /// type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \param drop_time maximum time elapsed before packet is
+    /// assumed dropped. Negative value disables it.
+    /// \throw isc::BadValue if exchange of specified type exists.
+    void addExchangeStats(const ExchangeType xchg_type,
+                          const double drop_time = -1) {
+        if (exchanges_.find(xchg_type) != exchanges_.end()) {
+            isc_throw(BadValue, "Exchange of specified type already added.");
+        }
+        exchanges_[xchg_type] =
+            ExchangeStatsPtr(new ExchangeStats(xchg_type,
+                                               drop_time,
+                                               archive_enabled_,
+                                               boot_time_));
+    }
+
+    /// \brief Check if the exchange type has been specified.
+    ///
+    /// This method checks if the \ref ExchangeStats object of a particular type
+    /// exists (has been added using \ref addExchangeStats function).
+    ///
+    /// \param xchg_type A type of the exchange being represented by the
+    /// \ref ExchangeStats object.
+    ///
+    /// \return true if the \ref ExchangeStats object has been added for a
+    /// specified exchange type.
+    bool hasExchangeStats(const ExchangeType xchg_type) const {
+        return (exchanges_.find(xchg_type) != exchanges_.end());
+    }
+
+    /// \brief Add named custom uint64 counter.
+    ///
+    /// Method creates new named counter and stores in counter's map under
+    /// key specified here as short_name.
+    ///
+    /// \param short_name key to use to access counter in the map.
+    /// \param long_name name of the counter presented in the log file.
+    void addCustomCounter(const std::string& short_name,
+                          const std::string& long_name) {
+        if (custom_counters_.find(short_name) != custom_counters_.end()) {
+            isc_throw(BadValue,
+                      "Custom counter " << short_name << " already added.");
+        }
+        custom_counters_[short_name] =
+            CustomCounterPtr(new CustomCounter(long_name));
+    }
+
+    /// \brief Check if any packet drops occurred.
+    ///
+    // \return true, if packet drops occurred.
+    bool droppedPackets() const {
+        for (ExchangesMapIterator it = exchanges_.begin();
+             it != exchanges_.end();
+             ++it) {
+            if (it->second->getDroppedPacketsNum() > 0) {
+                return (true);
+            }
+        }
+        return (false);
+    }
+
+    /// \brief Return specified counter.
+    ///
+    /// Method returns specified counter.
+    ///
+    /// \param counter_key key pointing to the counter in the counters map.
+    /// The short counter name has to be used to access counter.
+    /// \return pointer to specified counter object.
+    CustomCounterPtr getCounter(const std::string& counter_key) {
+        CustomCountersMapIterator it = custom_counters_.find(counter_key);
+        if (it == custom_counters_.end()) {
+            isc_throw(BadValue,
+                      "Custom counter " << counter_key << "does not exist");
+        }
+        return(it->second);
+    }
+
+    /// \brief Increment specified counter.
+    ///
+    /// Increment counter value by one.
+    ///
+    /// \param counter_key key pointing to the counter in the counters map.
+    /// \param value value to increment counter by.
+    /// \return pointer to specified counter after incrementation.
+    const CustomCounter& incrementCounter(const std::string& counter_key,
+                                          const uint64_t value = 1) {
+        CustomCounterPtr counter = getCounter(counter_key);
+        *counter += value;
+        return (*counter);
+    }
+
+    /// \brief Adds new packet to the sent packets list.
+    ///
+    /// Method adds new packet to the sent packets list.
+    /// Packets are added to the list sequentially and
+    /// most often read sequentially.
+    ///
+    /// \param xchg_type exchange type.
+    /// \param packet packet to be added to the list
+    /// \throw isc::BadValue if invalid exchange type specified or
+    /// packet is null.
+    void passSentPacket(const ExchangeType xchg_type,
+                        const dhcp::PktPtr& packet) {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        xchg_stats->appendSent(packet);
+    }
+
+    /// \brief Add new received packet and match with sent packet.
+    ///
+    /// Method adds new packet to the list of received packets. It
+    /// also searches for corresponding packet on the list of sent
+    /// packets. When packets are matched the statistics counters
+    /// are updated accordingly for the particular exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \param packet received packet
+    /// \throw isc::BadValue if invalid exchange type specified
+    /// or packet is null.
+    /// \throw isc::Unexpected if corresponding packet was not
+    /// found on the list of sent packets.
+    dhcp::PktPtr
+    passRcvdPacket(const ExchangeType xchg_type,
+                   const dhcp::PktPtr& packet) {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        dhcp::PktPtr sent_packet = xchg_stats->matchPackets(packet);
+
+        if (sent_packet) {
+            xchg_stats->updateDelays(sent_packet, packet);
+            if (archive_enabled_) {
+                xchg_stats->appendRcvd(packet);
+            }
+        }
+        return(sent_packet);
+    }
+
+    /// \brief Return minimum delay between sent and received packet.
+    ///
+    /// Method returns minimum delay between sent and received packet
+    /// for specified exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return minimum delay between packets.
+    double getMinDelay(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getMinDelay());
+    }
+
+    /// \brief Return maximum delay between sent and received packet.
+    ///
+    /// Method returns maximum delay between sent and received packet
+    /// for specified exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return maximum delay between packets.
+    double getMaxDelay(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getMaxDelay());
+    }
+
+    /// \brief Return average packet delay.
+    ///
+    /// Method returns average packet delay for specified
+    /// exchange type.
+    ///
+    /// \return average packet delay.
+    double getAvgDelay(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getAvgDelay());
+    }
+
+    /// \brief Return standard deviation of packet delay.
+    ///
+    /// Method returns standard deviation of packet delay
+    /// for specified exchange type.
+    ///
+    /// \return standard deviation of packet delay.
+    double getStdDevDelay(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getStdDevDelay());
+    }
+
+    /// \brief Return number of orphan packets.
+    ///
+    /// Method returns number of orphan packets for specified
+    /// exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of orphan packets so far.
+    uint64_t getOrphans(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getOrphans());
+    }
+
+    /// \brief Return average unordered lookup set size.
+    ///
+    /// Method returns average unordered lookup set size.
+    /// This value changes every time \ref ExchangeStats::matchPackets
+    /// function performs unordered packet lookup.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return average unordered lookup set size.
+    double getAvgUnorderedLookupSetSize(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getAvgUnorderedLookupSetSize());
+    }
+
+    /// \brief Return number of unordered sent packets lookups.
+    ///
+    /// Method returns number of unordered sent packet lookups.
+    /// Unordered lookup is used when received packet was sent
+    /// out of order by server - transaction id of received
+    /// packet does not match transaction id of next sent packet.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of unordered lookups.
+    uint64_t getUnorderedLookups(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getUnorderedLookups());
+    }
+
+    /// \brief Return number of ordered sent packets lookups.
+    ///
+    /// Method returns number of ordered sent packet lookups.
+    /// Ordered lookup is used when packets are received in the
+    /// same order as they were sent to the server.
+    /// If packets are skipped or received out of order, lookup
+    /// function will use unordered lookup (with hash table).
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of ordered lookups.
+    uint64_t getOrderedLookups(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getOrderedLookups());
+    }
+
+    /// \brief Return total number of sent packets.
+    ///
+    /// Method returns total number of sent packets for specified
+    /// exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of sent packets.
+    uint64_t getSentPacketsNum(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getSentPacketsNum());
+    }
+
+    /// \brief Return total number of received packets.
+    ///
+    /// Method returns total number of received packets for specified
+    /// exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of received packets.
+    uint64_t getRcvdPacketsNum(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getRcvdPacketsNum());
+    }
+
+    /// \brief Return total number of dropped packets.
+    ///
+    /// Method returns total number of dropped packets for specified
+    /// exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of dropped packets.
+    uint64_t getDroppedPacketsNum(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getDroppedPacketsNum());
+    }
+
+    /// \brief Return number of garbage collected packets.
+    ///
+    /// Method returns number of garbage collected timed out
+    /// packets. Packet is assumed timed out when duration
+    /// between sending it to server and receiving server's
+    /// response is greater than value specified with -d<value>
+    /// command line argument.
+    ///
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of garbage collected packets.
+    uint64_t getCollectedNum(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getCollectedNum());
+    }
+
+    /// \brief Return total number of rejected leases.
+    ///
+    /// Method returns total number of rejected leases for specified
+    /// exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of rejected leases.
+    uint64_t getRejLeasesNum(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getRejLeasesNum());
+    }
+
+    /// \brief Increase total number of rejected leases.
+    ///
+    /// Method increases total number of rejected leases by one
+    /// for specified exchange type.
+    void updateRejLeases(const ExchangeType xchg_type) {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        xchg_stats->updateRejLeases();
+    }
+
+    /// \brief Increase total number of non unique addresses.
+    ///
+    /// Method increases total number of non unique addresses or
+    /// prefixes by one for specified exchange type.
+    void updateNonUniqueAddrNum(const ExchangeType xchg_type) {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        xchg_stats->updateNonUniqueAddr();
+    }
+
+    /// \brief Return total number of non unique addresses.
+    ///
+    /// Method returns total number of non unique addresses and/or
+    /// prefixes for specified exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return number of non unique addresses.
+    uint64_t getNonUniqueAddrNum(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        return(xchg_stats->getNonUniqueAddrNum());
+    }
+
+    /// \brief Get time period since the start of test.
+    ///
+    /// Calculate dna return period since the test start. This
+    /// can be specifically helpful when calculating packet
+    /// exchange rates.
+    ///
+    /// \return test period so far.
+    boost::posix_time::time_period getTestPeriod() const {
+        using namespace boost::posix_time;
+        time_period test_period(boot_time_,
+                                microsec_clock::universal_time());
+        return test_period;
+    }
+
+    /// \brief Print statistics counters for all exchange types.
+    ///
+    /// Method prints statistics for all exchange types.
+    /// Statistics includes:
+    /// - number of sent and received packets
+    /// - number of dropped packets and number of orphans
+    /// - minimum packets delay,
+    /// - average packets delay,
+    /// - maximum packets delay,
+    /// - standard deviation of packets delay.
+    ///
+    /// \throw isc::InvalidOperation if no exchange type added to
+    /// track statistics.
+    void printStats() const {
+        if (exchanges_.empty()) {
+            isc_throw(isc::InvalidOperation,
+                      "no exchange type added for tracking");
+        }
+        for (ExchangesMapIterator it = exchanges_.begin();
+             it != exchanges_.end();
+             ++it) {
+            ExchangeStatsPtr xchg_stats = it->second;
+            std::cout << "***Statistics for: " << it->first
+                      << "***" << std::endl;
+            xchg_stats->printMainStats();
+            std::cout << std::endl;
+            xchg_stats->printRTTStats();
+            std::cout << std::endl;
+        }
+    }
+
+    /// \brief Print intermediate statistics.
+    ///
+    /// Method prints intermediate statistics for all exchanges.
+    /// Statistics includes sent, received and dropped packets
+    /// counters.
+    ///
+    /// \param clean_report value to generate easy to parse report.
+    /// \param clean_sep string used as separator if clean_report enabled..
+    void
+    printIntermediateStats(bool clean_report, std::string clean_sep) const {
+        std::ostringstream stream_sent;
+        std::ostringstream stream_rcvd;
+        std::ostringstream stream_drops;
+        std::ostringstream stream_reject;
+        std::string sep("");
+        for (ExchangesMapIterator it = exchanges_.begin();
+             it != exchanges_.end(); ++it) {
+
+            if (it != exchanges_.begin()) {
+                if (clean_report) {
+                    sep = clean_sep;
+                } else {
+                    sep = "/";
+                }
+            }
+            stream_sent << sep << it->second->getSentPacketsNum();
+            stream_rcvd << sep << it->second->getRcvdPacketsNum();
+            stream_drops << sep << it->second->getDroppedPacketsNum();
+            stream_reject << sep << it->second->getRejLeasesNum();
+        }
+
+        if (clean_report) {
+        std::cout << stream_sent.str()
+                  << clean_sep << stream_rcvd.str()
+                  << clean_sep << stream_drops.str()
+                  << clean_sep << stream_reject.str()
+                  << std::endl;
+
+        } else {
+        std::cout << "sent: " << stream_sent.str()
+                  << "; received: " << stream_rcvd.str()
+                  << "; drops: " << stream_drops.str()
+                  << "; rejected: " << stream_reject.str()
+                  << std::endl;
+        }
+    }
+
+    /// \brief Print timestamps of all packets.
+    ///
+    /// Method prints timestamps of all sent and received
+    /// packets for all defined exchange types.
+    ///
+    /// \throw isc::InvalidOperation if one of the packets has
+    /// no timestamp value set or if packets archive mode is
+    /// disabled.
+    ///
+    /// \throw isc::InvalidOperation if no exchange type added to
+    /// track statistics or packets archive mode is disabled.
+    void printTimestamps() const {
+        if (exchanges_.empty()) {
+            isc_throw(isc::InvalidOperation,
+                      "no exchange type added for tracking");
+        }
+        for (ExchangesMapIterator it = exchanges_.begin();
+             it != exchanges_.end();
+             ++it) {
+            ExchangeStatsPtr xchg_stats = it->second;
+            std::cout << "***Timestamps for packets: "
+                      << it->first
+                      << "***" << std::endl;
+            xchg_stats->printTimestamps();
+            std::cout << std::endl;
+        }
+    }
+
+    /// \brief Delegate to all exchanges to print their leases.
+    void printLeases() const;
+
+    /// \brief Print names and values of custom counters.
+    ///
+    /// Method prints names and values of custom counters. Custom counters
+    /// are defined by client class for tracking different statistics.
+    ///
+    /// \throw isc::InvalidOperation if no custom counters added for tracking.
+    void printCustomCounters() const {
+        if (custom_counters_.empty()) {
+            isc_throw(isc::InvalidOperation, "no custom counters specified");
+        }
+        for (CustomCountersMapIterator it = custom_counters_.begin();
+             it != custom_counters_.end();
+             ++it) {
+            CustomCounterPtr counter = it->second;
+            std::cout << counter->getName() << ": " << counter->getValue()
+                      << std::endl;
+        }
+    }
+
+    std::tuple<typename ExchangeStats::PktListIterator, typename ExchangeStats::PktListIterator> getSentPackets(const ExchangeType xchg_type) const {
+        ExchangeStatsPtr xchg_stats = getExchangeStats(xchg_type);
+        std::tuple<typename ExchangeStats::PktListIterator, typename ExchangeStats::PktListIterator> sent_packets_its = xchg_stats->getSentPackets();
+        return(sent_packets_its);
+    }
+
+private:
+
+    /// \brief Return exchange stats object for given exchange type.
+    ///
+    /// Method returns exchange stats object for given exchange type.
+    ///
+    /// \param xchg_type exchange type.
+    /// \throw isc::BadValue if invalid exchange type specified.
+    /// \return exchange stats object.
+    ExchangeStatsPtr getExchangeStats(const ExchangeType xchg_type) const {
+        ExchangesMapIterator it = exchanges_.find(xchg_type);
+        if (it == exchanges_.end()) {
+            isc_throw(BadValue, "Packets exchange not specified");
+        }
+        ExchangeStatsPtr xchg_stats = it->second;
+        return(xchg_stats);
+    }
+
+    ExchangesMap exchanges_;            ///< Map of exchange types.
+    CustomCountersMap custom_counters_; ///< Map with custom counters.
+
+    /// Indicates that packets from list of sent packets should be
+    /// archived (moved to list of archived packets) once they are
+    /// matched with received packets. This is required when it has
+    /// been selected from the command line to print packets'
+    /// timestamps after test. This may affect performance and
+    /// consume large amount of memory when the test is running
+    /// for extended period of time and many packets have to be
+    /// archived.
+    bool archive_enabled_;
+
+    boost::posix_time::ptime boot_time_; ///< Time when test is started.
+};
+
+/// Pointer to Statistics Manager;
+typedef boost::shared_ptr<StatsMgr> StatsMgrPtr;
+
+
+} // namespace perfdhcp
+} // namespace isc
+
+#endif // STATS_MGR_H
diff --git a/src/bin/perfdhcp/test_control.cc b/src/bin/perfdhcp/test_control.cc
new file mode 100644
index 0000000..c15153b
--- /dev/null
+++ b/src/bin/perfdhcp/test_control.cc
@@ -0,0 +1,1942 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/test_control.h>
+#include <perfdhcp/receiver.h>
+#include <perfdhcp/command_options.h>
+#include <perfdhcp/perf_pkt4.h>
+#include <perfdhcp/perf_pkt6.h>
+
+#include <exceptions/exceptions.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/option6_ia.h>
+#include <dhcp/option6_iaaddr.h>
+#include <dhcp/option6_iaprefix.h>
+#include <dhcp/option_int.h>
+#include <util/unittests/check_valgrind.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <algorithm>
+#include <fstream>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sstream>
+#include <sys/wait.h>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::asiolink;
+
+namespace isc {
+namespace perfdhcp {
+
+bool TestControl::interrupted_ = false;
+
+bool
+TestControl::waitToExit() {
+    uint32_t const wait_time = options_.getExitWaitTime();
+
+    // If we care and not all packets are in yet
+    if (wait_time && !haveAllPacketsBeenReceived()) {
+        const ptime now = microsec_clock::universal_time();
+
+        // Init the end time if it hasn't started yet
+        if (exit_time_.is_not_a_date_time()) {
+            exit_time_ = now + time_duration(microseconds(wait_time));
+        }
+
+        // If we're not at end time yet, return true
+        return (now < exit_time_);
+    }
+
+    // No need to wait, return false;
+    return (false);
+}
+
+bool
+TestControl::haveAllPacketsBeenReceived() const {
+    const uint8_t& ipversion = options_.getIpVersion();
+    const std::vector<int>& num_request = options_.getNumRequests();
+    const size_t& num_request_size = num_request.size();
+
+    if (num_request_size == 0) {
+        return false;
+    }
+
+    uint32_t responses = 0;
+    uint32_t requests = num_request[0];
+    if (num_request_size >= 2) {
+        requests += num_request[1];
+    }
+
+    if (ipversion == 4) {
+        responses = stats_mgr_.getRcvdPacketsNum(ExchangeType::DO) +
+                    stats_mgr_.getRcvdPacketsNum(ExchangeType::RA);
+    } else {
+        responses = stats_mgr_.getRcvdPacketsNum(ExchangeType::SA) +
+                    stats_mgr_.getRcvdPacketsNum(ExchangeType::RR);
+    }
+
+    return (responses == requests);
+}
+
+void
+TestControl::cleanCachedPackets() {
+    // When Renews are not sent, Reply packets are not cached so there
+    // is nothing to do.
+    if (options_.getRenewRate() == 0) {
+        return;
+    }
+
+    static boost::posix_time::ptime last_clean =
+        microsec_clock::universal_time();
+
+    // Check how much time has passed since last cleanup.
+    time_period time_since_clean(last_clean,
+                                 microsec_clock::universal_time());
+    // Cleanup every 1 second.
+    if (time_since_clean.length().total_seconds() >= 1) {
+        // Calculate how many cached packets to remove. Actually we could
+        // just leave enough packets to handle Renews for 1 second but
+        // since we want to randomize leases to be renewed so leave 5
+        // times more packets to randomize from.
+        /// @todo The cache size might be controlled from the command line.
+        if (reply_storage_.size() > 5 * options_.getRenewRate()) {
+            reply_storage_.clear(reply_storage_.size() -
+                                 5 * options_.getRenewRate());
+        }
+        // Remember when we performed a cleanup for the last time.
+        // We want to do the next cleanup not earlier than in one second.
+        last_clean = microsec_clock::universal_time();
+    }
+}
+
+void
+TestControl::copyIaOptions(const Pkt6Ptr& pkt_from, Pkt6Ptr& pkt_to) {
+    if (!pkt_from || !pkt_to) {
+        isc_throw(BadValue, "NULL pointers must not be specified as arguments"
+                  " for the copyIaOptions function");
+    }
+    // IA_NA
+    if (options_.getLeaseType()
+        .includes(CommandOptions::LeaseType::ADDRESS)) {
+        OptionPtr option = pkt_from->getOption(D6O_IA_NA);
+        if (!option) {
+            isc_throw(NotFound, "IA_NA option not found in the"
+                      " server's response");
+        }
+        pkt_to->addOption(option);
+    }
+    // IA_PD
+    if (options_.getLeaseType()
+        .includes(CommandOptions::LeaseType::PREFIX)) {
+        OptionPtr option = pkt_from->getOption(D6O_IA_PD);
+        if (!option) {
+            isc_throw(NotFound, "IA_PD option not found in the"
+                      " server's response");
+        }
+        pkt_to->addOption(option);
+    }
+}
+
+std::string
+TestControl::byte2Hex(const uint8_t b) {
+    const int b1 = b / 16;
+    const int b0 = b % 16;
+    ostringstream stream;
+    stream << std::hex << b1 << b0 << std::dec;
+    return (stream.str());
+}
+
+Pkt4Ptr
+TestControl::createMessageFromAck(const uint16_t msg_type,
+                                  const dhcp::Pkt4Ptr& ack) {
+    // Restrict messages to Release and Renew.
+    if (msg_type != DHCPREQUEST && msg_type != DHCPRELEASE) {
+        isc_throw(isc::BadValue, "invalid message type " << msg_type
+                  << " to be created from Reply, expected DHCPREQUEST or"
+                  " DHCPRELEASE");
+    }
+
+    // Get the string representation of the message - to be used for error
+    // logging purposes.
+    auto msg_type_str = [=]() -> const char* {
+        return (msg_type == DHCPREQUEST ? "Request" : "Release");
+    };
+
+    if (!ack) {
+        isc_throw(isc::BadValue, "Unable to create "
+                                     << msg_type_str()
+                                     << " from a null DHCPACK message");
+    } else if (ack->getYiaddr().isV4Zero()) {
+        isc_throw(isc::BadValue,
+                  "Unable to create "
+                      << msg_type_str()
+                      << " from a DHCPACK message containing yiaddr of 0");
+    }
+    Pkt4Ptr msg(new Pkt4(msg_type, generateTransid()));
+    msg->setCiaddr(ack->getYiaddr());
+    msg->setHWAddr(ack->getHWAddr());
+    msg->addOption(generateClientId(msg->getHWAddr()));
+    if (msg_type == DHCPRELEASE) {
+        // RFC 2132: DHCPRELEASE MUST include server ID.
+        if (options_.isUseFirst()) {
+            // Honor the '-1' flag if it exists.
+            if (first_packet_serverid_.empty()) {
+                isc_throw(isc::BadValue,
+                          "Unable to create "
+                              << msg_type_str()
+                              << "from the first packet which lacks the server "
+                                 "identifier option");
+            }
+            msg->addOption(Option::factory(Option::V4,
+                                           DHO_DHCP_SERVER_IDENTIFIER,
+                                           first_packet_serverid_));
+        } else {
+            // Otherwise take it from the DHCPACK message.
+            OptionPtr server_identifier(
+                ack->getOption(DHO_DHCP_SERVER_IDENTIFIER));
+            if (!server_identifier) {
+                isc_throw(isc::BadValue,
+                          "Unable to create "
+                              << msg_type_str()
+                              << "from a DHCPACK message without the server "
+                                 "identifier option");
+            }
+            msg->addOption(server_identifier);
+        }
+    }
+    return (msg);
+}
+
+Pkt6Ptr
+TestControl::createMessageFromReply(const uint16_t msg_type,
+                                    const dhcp::Pkt6Ptr& reply) {
+    // Restrict messages to Release and Renew.
+    if (msg_type != DHCPV6_RENEW && msg_type != DHCPV6_RELEASE) {
+        isc_throw(isc::BadValue, "invalid message type " << msg_type
+                  << " to be created from Reply, expected DHCPV6_RENEW or"
+                  " DHCPV6_RELEASE");
+    }
+
+    // Get the string representation of the message - to be used for error
+    // logging purposes.
+    auto msg_type_str = [=]() -> const char* {
+        return (msg_type == DHCPV6_RENEW ? "Renew" : "Release");
+    };
+
+    // Reply message must be specified.
+    if (!reply) {
+        isc_throw(isc::BadValue, "Unable to create " << msg_type_str()
+                  << " message from the Reply message because the instance of"
+                  " the Reply message is NULL");
+    }
+
+    Pkt6Ptr msg(new Pkt6(msg_type, generateTransid()));
+    // Client id.
+    OptionPtr opt_clientid = reply->getOption(D6O_CLIENTID);
+    if (!opt_clientid) {
+        isc_throw(isc::Unexpected, "failed to create " << msg_type_str()
+                  << " message because client id option has not been found"
+                  " in the Reply message");
+    }
+    msg->addOption(opt_clientid);
+    // Server id.
+    OptionPtr opt_serverid = reply->getOption(D6O_SERVERID);
+    if (!opt_serverid) {
+        isc_throw(isc::Unexpected, "failed to create " << msg_type_str()
+                  << " because server id option has not been found in the"
+                  " Reply message");
+    }
+    msg->addOption(opt_serverid);
+    copyIaOptions(reply, msg);
+    return (msg);
+}
+
+OptionPtr
+TestControl::factoryElapsedTime6(Option::Universe, uint16_t,
+                                 const OptionBuffer& buf) {
+    if (buf.size() == 2) {
+        return (OptionPtr(new Option(Option::V6, D6O_ELAPSED_TIME, buf)));
+    } else if (buf.size() == 0) {
+        return (OptionPtr(new Option(Option::V6, D6O_ELAPSED_TIME,
+                                     OptionBuffer(2, 0))));
+    }
+    isc_throw(isc::BadValue,
+              "elapsed time option buffer size has to be 0 or 2");
+}
+
+OptionPtr
+TestControl::factoryGeneric(Option::Universe u, uint16_t type,
+                            const OptionBuffer& buf) {
+    OptionPtr opt(new Option(u, type, buf));
+    return (opt);
+}
+
+OptionPtr
+TestControl::factoryIana6(Option::Universe, uint16_t,
+                          const OptionBuffer& buf) {
+    /// @todo allow different values of T1, T2 and IAID.
+    const uint8_t buf_array[] = {
+        0, 0, 0, 1,                     // IAID = 1
+        0, 0, 3600 >> 8, 3600 & 0xff,  // T1 = 3600
+        0, 0, 5400 >> 8, 5400 & 0xff,   // T2 = 5400
+    };
+    OptionBuffer buf_ia_na(buf_array, buf_array + sizeof(buf_array));
+    for (size_t i = 0;  i < buf.size(); ++i) {
+        buf_ia_na.push_back(buf[i]);
+    }
+    return (OptionPtr(new Option(Option::V6, D6O_IA_NA, buf_ia_na)));
+}
+
+OptionPtr
+TestControl::factoryIapd6(Option::Universe, uint16_t,
+                          const OptionBuffer& buf) {
+    /// @todo allow different values of T1, T2 and IAID.
+    static const uint8_t buf_array[] = {
+        0, 0, 0, 1,                     // IAID = 1
+        0, 0, 3600 >> 8, 3600 & 0xff,   // T1 = 3600
+        0, 0, 5400 >> 8, 5400 & 0xff,   // T2 = 5400
+    };
+    OptionBuffer buf_ia_pd(buf_array, buf_array + sizeof(buf_array));
+    // Append sub-options to IA_PD.
+    buf_ia_pd.insert(buf_ia_pd.end(), buf.begin(), buf.end());
+    return (OptionPtr(new Option(Option::V6, D6O_IA_PD, buf_ia_pd)));
+}
+
+
+OptionPtr
+TestControl::factoryRapidCommit6(Option::Universe, uint16_t,
+                                 const OptionBuffer&) {
+    return (OptionPtr(new Option(Option::V6, D6O_RAPID_COMMIT, OptionBuffer())));
+}
+
+OptionPtr
+TestControl::factoryOptionRequestOption6(Option::Universe,
+                                         uint16_t,
+                                         const OptionBuffer&) {
+    const uint8_t buf_array[] = {
+        0, D6O_NAME_SERVERS,
+        0, D6O_DOMAIN_SEARCH,
+    };
+    OptionBuffer buf_with_options(buf_array, buf_array + sizeof(buf_array));
+    return (OptionPtr(new Option(Option::V6, D6O_ORO, buf_with_options)));
+}
+
+
+OptionPtr
+TestControl::factoryRequestList4(Option::Universe u,
+                                 uint16_t type,
+                                 const OptionBuffer& buf) {
+    const uint8_t buf_array[] = {
+        DHO_SUBNET_MASK,
+        DHO_BROADCAST_ADDRESS,
+        DHO_TIME_OFFSET,
+        DHO_ROUTERS,
+        DHO_DOMAIN_NAME,
+        DHO_DOMAIN_NAME_SERVERS,
+        DHO_HOST_NAME
+    };
+
+    OptionBuffer buf_with_options(buf_array, buf_array + sizeof(buf_array));
+    OptionPtr opt(new Option(u, type, buf));
+    opt->setData(buf_with_options.begin(), buf_with_options.end());
+    return (opt);
+}
+
+std::vector<uint8_t>
+TestControl::generateMacAddress(uint8_t& randomized) {
+    const CommandOptions::MacAddrsVector& macs = options_.getMacsFromFile();
+    // if we are using the -M option return a random one from the list...
+    if (macs.size() > 0) {
+      uint16_t r = number_generator_();
+      if (r >= macs.size()) {
+        r = 0;
+      }
+      return macs[r];
+
+    } else {
+      // ... otherwise use the standard behavior
+      uint32_t clients_num = options_.getClientsNum();
+      if (clients_num < 2) {
+          return (options_.getMacTemplate());
+      }
+      // Get the base MAC address. We are going to randomize part of it.
+      std::vector<uint8_t> mac_addr(options_.getMacTemplate());
+      if (mac_addr.size() != HW_ETHER_LEN) {
+          isc_throw(BadValue, "invalid MAC address template specified");
+      }
+      uint32_t r = macaddr_gen_->generate();
+      randomized = 0;
+      // Randomize MAC address octets.
+      for (std::vector<uint8_t>::iterator it = mac_addr.end() - 1;
+           it >= mac_addr.begin();
+           --it) {
+          // Add the random value to the current octet.
+          (*it) += r;
+          ++randomized;
+          if (r < 256) {
+              // If we are here it means that there is no sense
+              // to randomize the remaining octets of MAC address
+              // because the following bytes of random value
+              // are zero and it will have no effect.
+              break;
+          }
+          // Randomize the next octet with the following
+          // byte of random value.
+          r >>= 8;
+      }
+      return (mac_addr);
+    }
+}
+
+OptionPtr
+TestControl::generateClientId(const dhcp::HWAddrPtr& hwaddr) const {
+    std::vector<uint8_t> client_id(1, static_cast<uint8_t>(hwaddr->htype_));
+    client_id.insert(client_id.end(), hwaddr->hwaddr_.begin(),
+                     hwaddr->hwaddr_.end());
+    return (OptionPtr(new Option(Option::V4, DHO_DHCP_CLIENT_IDENTIFIER,
+                                 client_id)));
+}
+
+std::vector<uint8_t>
+TestControl::generateDuid(uint8_t& randomized) {
+    std::vector<uint8_t> mac_addr(generateMacAddress(randomized));
+    const CommandOptions::MacAddrsVector& macs = options_.getMacsFromFile();
+    // pick a random mac address if we are using option -M..
+    if (macs.size() > 0) {
+      uint16_t r = number_generator_();
+      if (r >= macs.size()) {
+        r = 0;
+      }
+      std::vector<uint8_t> mac = macs[r];
+      // DUID_LL is in this format
+      //  0                   1                   2                   3
+      //  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+      // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      // |               3               |    hardware type (16 bits)    |
+      // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      // .                                                               .
+      // .             link-layer address (variable length)              .
+      // .                                                               .
+      // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+      // No C++11 so initializer list support, building a vector<uint8_t> is a
+      // pain...
+      uint8_t duid_ll[] = {0, 3, 0, 1, 0, 0, 0, 0, 0, 0};
+      // copy duid_ll array into the vector
+      std::vector<uint8_t> duid(duid_ll,
+                                duid_ll + sizeof(duid_ll) / sizeof(duid_ll[0]));
+      // put the mac address bytes at the end
+      std::copy(mac.begin(), mac.end(), duid.begin() + 4);
+      return (duid);
+    } else {
+      uint32_t clients_num = options_.getClientsNum();
+      if ((clients_num == 0) || (clients_num == 1)) {
+          return (options_.getDuidTemplate());
+      }
+      // Get the base DUID. We are going to randomize part of it.
+      std::vector<uint8_t> duid(options_.getDuidTemplate());
+      /// @todo: add support for DUIDs of different sizes.
+      duid.resize(duid.size());
+      std::copy(mac_addr.begin(), mac_addr.end(),
+                duid.begin() + duid.size() - mac_addr.size());
+      return (duid);
+    }
+}
+
+int
+TestControl::getElapsedTimeOffset() const {
+    int elp_offset = options_.getIpVersion() == 4 ?
+        DHCPV4_ELAPSED_TIME_OFFSET : DHCPV6_ELAPSED_TIME_OFFSET;
+    if (options_.getElapsedTimeOffset() > 0) {
+        elp_offset = options_.getElapsedTimeOffset();
+    }
+    return (elp_offset);
+}
+
+template<class T>
+uint32_t
+TestControl::getElapsedTime(const T& pkt1, const T& pkt2) {
+    using namespace boost::posix_time;
+    ptime pkt1_time = pkt1->getTimestamp();
+    ptime pkt2_time = pkt2->getTimestamp();
+    if (pkt1_time.is_not_a_date_time() ||
+        pkt2_time.is_not_a_date_time()) {
+        isc_throw(InvalidOperation, "packet timestamp not set");;
+    }
+    time_period elapsed_period(pkt1_time, pkt2_time);
+    return (elapsed_period.is_null() ? 0 :
+            elapsed_period.length().total_milliseconds());
+}
+
+int
+TestControl::getRandomOffset(const int arg_idx) const {
+    int rand_offset = options_.getIpVersion() == 4 ?
+        DHCPV4_RANDOMIZATION_OFFSET : DHCPV6_RANDOMIZATION_OFFSET;
+    if (options_.getRandomOffset().size() > arg_idx) {
+        rand_offset = options_.getRandomOffset()[arg_idx];
+    }
+    return (rand_offset);
+}
+
+int
+TestControl::getRequestedIpOffset() const {
+    int rip_offset = options_.getIpVersion() == 4 ?
+        DHCPV4_REQUESTED_IP_OFFSET : DHCPV6_IA_NA_OFFSET;
+    if (options_.getRequestedIpOffset() > 0) {
+        rip_offset = options_.getRequestedIpOffset();
+    }
+    return (rip_offset);
+}
+
+int
+TestControl::getServerIdOffset() const {
+    int srvid_offset = options_.getIpVersion() == 4 ?
+        DHCPV4_SERVERID_OFFSET : DHCPV6_SERVERID_OFFSET;
+    if (options_.getServerIdOffset() > 0) {
+        srvid_offset = options_.getServerIdOffset();
+    }
+    return (srvid_offset);
+}
+
+TestControl::TemplateBuffer
+TestControl::getTemplateBuffer(const size_t idx) const {
+    if (template_buffers_.size() > idx) {
+        return (template_buffers_[idx]);
+    }
+    isc_throw(OutOfRange, "invalid buffer index");
+}
+
+int
+TestControl::getTransactionIdOffset(const int arg_idx) const {
+    int xid_offset = options_.getIpVersion() == 4 ?
+        DHCPV4_TRANSID_OFFSET : DHCPV6_TRANSID_OFFSET;
+    if (options_.getTransactionIdOffset().size() > arg_idx) {
+        xid_offset = options_.getTransactionIdOffset()[arg_idx];
+    }
+    return (xid_offset);
+}
+
+void
+TestControl::handleChild(int) {
+    int status = 0;
+    while (wait3(&status, WNOHANG, NULL) > 0) {
+        // continue
+    }
+}
+
+void
+TestControl::handleInterrupt(int) {
+    interrupted_ = true;
+}
+
+void
+TestControl::initPacketTemplates() {
+    template_packets_v4_.clear();
+    template_packets_v6_.clear();
+    template_buffers_.clear();
+    std::vector<std::string> template_files = options_.getTemplateFiles();
+    for (std::vector<std::string>::const_iterator it = template_files.begin();
+         it != template_files.end(); ++it) {
+        readPacketTemplate(*it);
+    }
+}
+
+void
+TestControl::sendPackets(const uint64_t packets_num,
+                         const bool preload /* = false */) {
+    for (uint64_t i = packets_num; i > 0; --i) {
+        if (options_.getIpVersion() == 4) {
+            // No template packets means that no -T option was specified.
+            // We have to build packets ourselves.
+            if (template_buffers_.empty()) {
+                sendDiscover4(preload);
+            } else {
+                /// @todo add defines for packet type index that can be
+                /// used to access template_buffers_.
+                sendDiscover4(template_buffers_[0], preload);
+            }
+        } else {
+            // No template packets means that no -T option was specified.
+            // We have to build packets ourselves.
+            if (template_buffers_.empty()) {
+                sendSolicit6(preload);
+            } else {
+                /// @todo add defines for packet type index that can be
+                /// used to access template_buffers_.
+                sendSolicit6(template_buffers_[0], preload);
+            }
+        }
+    }
+}
+
+uint64_t
+TestControl::sendMultipleMessages4(const uint32_t msg_type,
+                                   const uint64_t msg_num) {
+    for (uint64_t i = 0; i < msg_num; ++i) {
+        if (!sendMessageFromAck(msg_type)) {
+            return (i);
+        }
+    }
+    return (msg_num);
+}
+
+uint64_t
+TestControl::sendMultipleMessages6(const uint32_t msg_type,
+                                   const uint64_t msg_num) {
+    for (uint64_t i = 0; i < msg_num; ++i) {
+        if (!sendMessageFromReply(msg_type)) {
+            return (i);
+        }
+    }
+    return (msg_num);
+}
+
+void
+TestControl::printDiagnostics() const {
+    if (options_.testDiags('a')) {
+        // Print all command line parameters.
+        options_.printCommandLine();
+        // Print MAC and DUID.
+        std::cout << "Set MAC to " << vector2Hex(options_.getMacTemplate(), "::")
+                  << std::endl;
+        if (options_.getDuidTemplate().size() > 0) {
+            std::cout << "Set DUID to " << vector2Hex(options_.getDuidTemplate()) << std::endl;
+        }
+    }
+}
+
+void
+TestControl::printTemplate(const uint8_t packet_type) const {
+    std::string hex_buf;
+    int arg_idx = 0;
+    if (options_.getIpVersion() == 4) {
+        if (packet_type == DHCPREQUEST) {
+            arg_idx = 1;
+        }
+        std::map<uint8_t, dhcp::Pkt4Ptr>::const_iterator pkt_it =
+            template_packets_v4_.find(packet_type);
+        if ((pkt_it != template_packets_v4_.end()) &&
+            pkt_it->second) {
+            const util::OutputBuffer& out_buf(pkt_it->second->getBuffer());
+            const char* out_buf_data =
+                static_cast<const char*>(out_buf.getData());
+            std::vector<uint8_t> buf(out_buf_data, out_buf_data + out_buf.getLength());
+            hex_buf = vector2Hex(buf);
+        }
+    } else if (options_.getIpVersion() == 6) {
+        if (packet_type == DHCPV6_REQUEST) {
+            arg_idx = 1;
+        }
+        std::map<uint8_t, dhcp::Pkt6Ptr>::const_iterator pkt_it =
+            template_packets_v6_.find(packet_type);
+        if (pkt_it != template_packets_v6_.end() &&
+            pkt_it->second) {
+            const util::OutputBuffer& out_buf(pkt_it->second->getBuffer());
+            const char* out_buf_data =
+                static_cast<const char*>(out_buf.getData());
+            std::vector<uint8_t> buf(out_buf_data, out_buf_data + out_buf.getLength());
+            hex_buf = vector2Hex(buf);
+        }
+    }
+    std::cout << "xid-offset=" << getTransactionIdOffset(arg_idx) << std::endl;
+    std::cout << "random-offset=" << getRandomOffset(arg_idx) << std::endl;
+    if (arg_idx > 0) {
+        std::cout << "srvid-offset=" << getServerIdOffset() << std::endl;
+        std::cout << "time-offset=" << getElapsedTimeOffset() << std::endl;
+        std::cout << "ip-offset=" << getRequestedIpOffset() << std::endl;
+    }
+
+    std::cout << "contents: " << std::endl;
+    int line_len = 32;
+    int i = 0;
+    while (line_len == 32) {
+        if (hex_buf.length() - i < 32) {
+            line_len = hex_buf.length() - i;
+        };
+        if (line_len > 0) {
+            std::cout << setfill('0') << setw(4) << std::hex << i << std::dec
+                      << "   " << hex_buf.substr(i, line_len) << std::endl;
+        }
+        i += 32;
+    }
+    std::cout << std::endl;
+}
+
+void
+TestControl::printTemplates() const {
+    if (options_.getIpVersion() == 4) {
+        printTemplate(DHCPDISCOVER);
+        printTemplate(DHCPREQUEST);
+    } else if (options_.getIpVersion() == 6) {
+        printTemplate(DHCPV6_SOLICIT);
+        printTemplate(DHCPV6_REQUEST);
+    }
+}
+
+void
+TestControl::printRate() const {
+    double rate = 0;
+    std::string exchange_name = "4-way exchanges";
+    ExchangeType xchg_type = ExchangeType::DO;
+    if (options_.getIpVersion() == 4) {
+        xchg_type =
+            options_.getExchangeMode() == CommandOptions::DO_SA ?
+            ExchangeType::DO : ExchangeType::RA;
+        if (xchg_type == ExchangeType::DO) {
+            exchange_name = "DISCOVER-OFFER";
+        }
+    } else if (options_.getIpVersion() == 6) {
+        xchg_type =
+            options_.getExchangeMode() == CommandOptions::DO_SA ?
+            ExchangeType::SA : ExchangeType::RR;
+        if (xchg_type == ExchangeType::SA) {
+            exchange_name = options_.isRapidCommit() ? "Solicit-Reply" :
+                "Solicit-Advertise";
+        }
+    }
+    double duration =
+        stats_mgr_.getTestPeriod().length().total_nanoseconds() / 1e9;
+    rate = stats_mgr_.getRcvdPacketsNum(xchg_type) / duration;
+    std::ostringstream s;
+    s << "***Rate statistics***" << std::endl;
+    s << "Rate: " << rate << " " << exchange_name << "/second";
+    if (options_.getRate() > 0) {
+        s << ", expected rate: " << options_.getRate() << std::endl;
+    }
+
+    std::cout << s.str() << std::endl;
+
+    std::cout <<"***Malformed Packets***" << std::endl
+              << "Malformed packets: " << ExchangeStats::malformed_pkts_
+              << std::endl;
+}
+
+void
+TestControl::printIntermediateStats() {
+    int delay = options_.getReportDelay();
+    ptime now = microsec_clock::universal_time();
+    time_period time_since_report(last_report_, now);
+    if (time_since_report.length().total_seconds() >= delay) {
+        stats_mgr_.printIntermediateStats(options_.getCleanReport(),
+                                          options_.getCleanReportSeparator());
+        last_report_ = now;
+    }
+}
+
+void
+TestControl::printStats() const {
+    printRate();
+    stats_mgr_.printStats();
+    if (options_.testDiags('i')) {
+        stats_mgr_.printCustomCounters();
+    }
+}
+
+std::string
+TestControl::vector2Hex(const std::vector<uint8_t>& vec,
+                        const std::string& separator /* = "" */) {
+    std::ostringstream stream;
+    for (std::vector<uint8_t>::const_iterator it = vec.begin();
+         it != vec.end();
+         ++it) {
+        if (it == vec.begin()) {
+            stream << byte2Hex(*it);
+        } else {
+            stream << separator << byte2Hex(*it);
+        }
+    }
+    return (stream.str());
+}
+
+void
+TestControl::readPacketTemplate(const std::string& file_name) {
+    std::ifstream temp_file;
+    temp_file.open(file_name.c_str(), ios::in | ios::binary | ios::ate);
+    if (!temp_file.is_open()) {
+        isc_throw(BadValue, "unable to open template file " << file_name);
+    }
+    // Read template file contents.
+    std::streampos temp_size = temp_file.tellg();
+    if (temp_size == std::streampos(0)) {
+        temp_file.close();
+        isc_throw(OutOfRange, "the template file " << file_name << " is empty");
+    }
+    temp_file.seekg(0, ios::beg);
+    std::vector<char> file_contents(temp_size);
+    temp_file.read(&file_contents[0], temp_size);
+    temp_file.close();
+    // Spaces are allowed so we have to strip the contents
+    // from them. In the same time we want to make sure that
+    // apart from spaces the file contains hexadecimal digits
+    // only.
+    std::vector<char> hex_digits;
+    for (size_t i = 0; i < file_contents.size(); ++i) {
+        if (isxdigit(file_contents[i])) {
+            hex_digits.push_back(file_contents[i]);
+        } else if (!isxdigit(file_contents[i]) &&
+                   !isspace(file_contents[i])) {
+            isc_throw(BadValue, "'" << file_contents[i] << "' is not a"
+                      " hexadecimal digit");
+        }
+    }
+    // Expect even number of digits.
+    if (hex_digits.size() % 2 != 0) {
+        isc_throw(OutOfRange, "odd number of digits in template file");
+    } else if (hex_digits.empty()) {
+        isc_throw(OutOfRange, "template file " << file_name << " is empty");
+    }
+    std::vector<uint8_t> binary_stream;
+    for (size_t i = 0; i < hex_digits.size(); i += 2) {
+        stringstream s;
+        s << "0x" << hex_digits[i] << hex_digits[i+1];
+        int b;
+        s >> std::hex >> b;
+        binary_stream.push_back(static_cast<uint8_t>(b));
+    }
+    template_buffers_.push_back(binary_stream);
+}
+
+void
+TestControl::processReceivedPacket4(const Pkt4Ptr& pkt4) {
+    if (pkt4->getType() == DHCPOFFER) {
+        PktPtr pkt = stats_mgr_.passRcvdPacket(ExchangeType::DO, pkt4);
+        address4Uniqueness(pkt4, ExchangeType::DO);
+        Pkt4Ptr discover_pkt4(boost::dynamic_pointer_cast<Pkt4>(pkt));
+        CommandOptions::ExchangeMode xchg_mode = options_.getExchangeMode();
+        if ((xchg_mode == CommandOptions::DORA_SARR) && discover_pkt4) {
+            if (template_buffers_.size() < 2) {
+                sendRequest4(discover_pkt4, pkt4);
+            } else {
+                /// @todo add defines for packet type index that can be
+                /// used to access template_buffers_.
+                sendRequest4(template_buffers_[1], discover_pkt4, pkt4);
+            }
+        }
+    } else if (pkt4->getType() == DHCPACK) {
+        // If received message is DHCPACK, we have to check if this is
+        // a response to 4-way exchange. We'll match this packet with
+        // a DHCPREQUEST sent as part of the 4-way exchanges.
+        if (stats_mgr_.passRcvdPacket(ExchangeType::RA, pkt4)) {
+            address4Uniqueness(pkt4, ExchangeType::RA);
+            // The DHCPACK belongs to DHCPREQUEST-DHCPACK exchange type.
+            // So, we may need to keep this DHCPACK in the storage if renews.
+            // Note that, DHCPACK messages hold the information about
+            // leases assigned. We use this information to renew.
+            if (stats_mgr_.hasExchangeStats(ExchangeType::RNA) ||
+                stats_mgr_.hasExchangeStats(ExchangeType::RLA)) {
+                // Renew or release messages are sent, because StatsMgr has the
+                // specific exchange type specified. Let's append the DHCPACK
+                // message to a storage.
+                ack_storage_.append(pkt4);
+            }
+        // The DHCPACK message is not a server's response to the DHCPREQUEST
+        // message sent within the 4-way exchange. It may be a response to a
+        // renewal. In this case we first check if StatsMgr has exchange type
+        // for renew specified, and if it has, if there is a corresponding
+        // renew message for the received DHCPACK.
+        } else if (stats_mgr_.hasExchangeStats(ExchangeType::RNA)) {
+            stats_mgr_.passRcvdPacket(ExchangeType::RNA, pkt4);
+        }
+    }
+}
+
+void
+TestControl::address6Uniqueness(const Pkt6Ptr& pkt6, ExchangeType xchg_type) {
+    // check if received address is unique
+    if (options_.getAddrUnique()) {
+        std::set<std::string> current;
+        // addresses were already checked in validateIA
+        // we can safely assume that those are correct
+        for (const auto& opt : pkt6->options_) {
+            switch (opt.second->getType()) {
+            case D6O_IA_PD: {
+                // add address and check if it has not been already assigned
+                // addresses should be unique cross options of the packet
+                auto ret = current.emplace(boost::dynamic_pointer_cast<
+                    Option6IAPrefix>(opt.second->getOption(D6O_IAPREFIX))->getAddress().toText());
+                if (!ret.second) {
+                    stats_mgr_.updateNonUniqueAddrNum(xchg_type);
+                }
+                break;
+            }
+            case D6O_IA_NA: {
+                // add address and check if it has not been already assigned
+                // addresses should be unique cross options of the packet
+                auto ret = current.emplace(boost::dynamic_pointer_cast<
+                    Option6IAAddr>(opt.second->getOption(D6O_IAADDR))->getAddress().toText());
+                if (!ret.second) {
+                    stats_mgr_.updateNonUniqueAddrNum(xchg_type);
+                }
+                break;
+            }
+            default:
+                break;
+            }
+        }
+        // addresses should be unique cross packets
+        addUniqeAddr(current, xchg_type);
+    }
+}
+
+void
+TestControl::address4Uniqueness(const Pkt4Ptr& pkt4, ExchangeType xchg_type) {
+    // check if received address is unique
+    if (options_.getAddrUnique()) {
+        // addresses were already checked in validateIA
+        // we can safely assume that those are correct
+        std::set<std::string> current;
+        current.insert(pkt4->getYiaddr().toText());
+        // addresses should be unique cross packets
+        addUniqeAddr(current, xchg_type);
+    }
+}
+
+bool
+TestControl::validateIA(const Pkt6Ptr& pkt6) {
+    // check if iaaddr exists - if it does, we can continue sending request
+    // if not we will update statistics about rejected leases
+    // @todo it's checking just one iaaddress option for now it's ok
+    // but when perfdhcp will be extended to create message with multiple IA
+    // this will have to be iterate on:
+    // OptionCollection ias = pkt6->getOptions(D6O_IA_NA);
+    Option6IAPrefixPtr iapref;
+    Option6IAAddrPtr iaaddr;
+    if (pkt6->getOption(D6O_IA_PD)) {
+        iapref = boost::dynamic_pointer_cast<
+                 Option6IAPrefix>(pkt6->getOption(D6O_IA_PD)->getOption(D6O_IAPREFIX));
+    }
+    if (pkt6->getOption(D6O_IA_NA)) {
+        iaaddr = boost::dynamic_pointer_cast<
+                 Option6IAAddr>(pkt6->getOption(D6O_IA_NA)->getOption(D6O_IAADDR));
+    }
+
+    bool address_and_prefix = options_.getLeaseType().includes(
+                              CommandOptions::LeaseType::ADDRESS_AND_PREFIX);
+    bool prefix_only = options_.getLeaseType().includes(
+                       CommandOptions::LeaseType::PREFIX);
+    bool address_only = options_.getLeaseType().includes(
+                        CommandOptions::LeaseType::ADDRESS);
+    if ((address_and_prefix && iapref && iaaddr) ||
+        (prefix_only && iapref && !address_and_prefix) ||
+        (address_only && iaaddr && !address_and_prefix)) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void
+TestControl::processReceivedPacket6(const Pkt6Ptr& pkt6) {
+    uint8_t packet_type = pkt6->getType();
+    if (packet_type == DHCPV6_ADVERTISE) {
+        PktPtr pkt = stats_mgr_.passRcvdPacket(ExchangeType::SA, pkt6);
+        Pkt6Ptr solicit_pkt6(boost::dynamic_pointer_cast<Pkt6>(pkt));
+        CommandOptions::ExchangeMode xchg_mode = options_.getExchangeMode();
+        if ((xchg_mode == CommandOptions::DORA_SARR) && solicit_pkt6) {
+            if (validateIA(pkt6)) {
+               // if address is correct - check uniqueness
+               address6Uniqueness(pkt6, ExchangeType::SA);
+               if (template_buffers_.size() < 2) {
+                    sendRequest6(pkt6);
+               } else {
+                    /// @todo add defines for packet type index that can be
+                    /// used to access template_buffers_.
+                    sendRequest6(template_buffers_[1], pkt6);
+               }
+            } else {
+                stats_mgr_.updateRejLeases(ExchangeType::SA);
+            }
+        }
+    } else if (packet_type == DHCPV6_REPLY) {
+        // If the received message is Reply, we have to find out which exchange
+        // type the Reply message belongs to. It is doable by matching the Reply
+        // transaction id with the transaction id of the sent Request, Renew
+        // or Release. First we start with the Request.
+        if (stats_mgr_.passRcvdPacket(ExchangeType::RR, pkt6)) {
+            // The Reply belongs to Request-Reply exchange type. So, we may need
+            // to keep this Reply in the storage if Renews or/and Releases are
+            // being sent. Note that, Reply messages hold the information about
+            // leases assigned. We use this information to construct Renew and
+            // Release messages.
+            if (validateIA(pkt6)) {
+                // if address is correct - check uniqueness
+                address6Uniqueness(pkt6, ExchangeType::RR);
+                // check if there is correct IA to continue with Renew/Release
+                if (stats_mgr_.hasExchangeStats(ExchangeType::RN) ||
+                    stats_mgr_.hasExchangeStats(ExchangeType::RL)) {
+                    // Renew or Release messages are sent, because StatsMgr has the
+                    // specific exchange type specified. Let's append the Reply
+                    // message to a storage.
+                    reply_storage_.append(pkt6);
+                }
+            } else {
+                stats_mgr_.updateRejLeases(ExchangeType::RR);
+            }
+        // The Reply message is not a server's response to the Request message
+        // sent within the 4-way exchange. It may be a response to the Renew
+        // or Release message. In the if clause we first check if StatsMgr
+        // has exchange type for Renew specified, and if it has, if there is
+        // a corresponding Renew message for the received Reply. If not,
+        // we check that StatsMgr has exchange type for Release specified,
+        // as possibly the Reply has been sent in response to Release.
+        } else if (!(stats_mgr_.hasExchangeStats(ExchangeType::RN) &&
+                     stats_mgr_.passRcvdPacket(ExchangeType::RN, pkt6)) &&
+                   stats_mgr_.hasExchangeStats(ExchangeType::RL)) {
+            // At this point, it is only possible that the Reply has been sent
+            // in response to a Release. Try to match the Reply with Release.
+            stats_mgr_.passRcvdPacket(ExchangeType::RL, pkt6);
+        }
+    }
+}
+
+unsigned int
+TestControl::consumeReceivedPackets() {
+    unsigned int pkt_count = 0;
+    PktPtr pkt;
+    while ((pkt = receiver_.getPkt())) {
+        pkt_count += 1;
+        if (options_.getIpVersion() == 4) {
+            Pkt4Ptr pkt4 = boost::dynamic_pointer_cast<Pkt4>(pkt);
+            processReceivedPacket4(pkt4);
+        } else {
+            Pkt6Ptr pkt6 = boost::dynamic_pointer_cast<Pkt6>(pkt);
+            processReceivedPacket6(pkt6);
+        }
+    }
+    return pkt_count;
+}
+void
+TestControl::registerOptionFactories4() const {
+    static bool factories_registered = false;
+    if (!factories_registered) {
+        // DHCP_MESSAGE_TYPE option factory.
+        LibDHCP::OptionFactoryRegister(Option::V4,
+                                       DHO_DHCP_MESSAGE_TYPE,
+                                       &TestControl::factoryGeneric);
+        // DHCP_SERVER_IDENTIFIER option factory.
+        LibDHCP::OptionFactoryRegister(Option::V4,
+                                       DHO_DHCP_SERVER_IDENTIFIER,
+                                       &TestControl::factoryGeneric);
+        // DHCP_PARAMETER_REQUEST_LIST option factory.
+        LibDHCP::OptionFactoryRegister(Option::V4,
+                                       DHO_DHCP_PARAMETER_REQUEST_LIST,
+                                       &TestControl::factoryRequestList4);
+    }
+    factories_registered = true;
+}
+
+void
+TestControl::registerOptionFactories6() const {
+    static bool factories_registered = false;
+    if (!factories_registered) {
+        // D6O_ELAPSED_TIME
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_ELAPSED_TIME,
+                                       &TestControl::factoryElapsedTime6);
+        // D6O_RAPID_COMMIT
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_RAPID_COMMIT,
+                                       &TestControl::factoryRapidCommit6);
+        // D6O_ORO (option request option) factory.
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_ORO,
+                                       &TestControl::factoryOptionRequestOption6);
+        // D6O_CLIENTID option factory.
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_CLIENTID,
+                                       &TestControl::factoryGeneric);
+        // D6O_SERVERID option factory.
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_SERVERID,
+                                       &TestControl::factoryGeneric);
+        // D6O_IA_NA option factory.
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_IA_NA,
+                                       &TestControl::factoryIana6);
+
+        // D6O_IA_PD option factory.
+        LibDHCP::OptionFactoryRegister(Option::V6,
+                                       D6O_IA_PD,
+                                       &TestControl::factoryIapd6);
+
+
+    }
+    factories_registered = true;
+}
+
+void
+TestControl::registerOptionFactories() const {
+    switch(options_.getIpVersion()) {
+    case 4:
+        registerOptionFactories4();
+        break;
+    case 6:
+        registerOptionFactories6();
+        break;
+    default:
+        isc_throw(InvalidOperation, "command line options have to be parsed "
+                  "before DHCP option factories can be registered");
+    }
+}
+
+void
+TestControl::reset() {
+    transid_gen_.reset();
+    last_report_ = microsec_clock::universal_time();
+    // Actual generators will have to be set later on because we need to
+    // get command line parameters first.
+    setTransidGenerator(NumberGeneratorPtr());
+    setMacAddrGenerator(NumberGeneratorPtr());
+    first_packet_serverid_.clear();
+    interrupted_ = false;
+}
+
+TestControl::TestControl(CommandOptions& options, BasePerfSocket &socket) :
+    exit_time_(not_a_date_time),
+    number_generator_(0, options.getMacsFromFile().size()),
+    socket_(socket),
+    receiver_(socket, options.isSingleThreaded(), options.getIpVersion()),
+    stats_mgr_(options),
+    options_(options)
+{
+    // Reset singleton state before test starts.
+    reset();
+
+    // Ip version is not set ONLY in case the command options
+    // were not parsed. This surely means that parse() function
+    // was not called prior to starting the test. This is fatal
+    // error.
+    if (options_.getIpVersion() == 0) {
+        isc_throw(InvalidOperation,
+                  "command options must be parsed before running a test");
+    } else if (options_.getIpVersion() == 4) {
+        // Turn off packet queueing.
+        IfaceMgr::instance().configureDHCPPacketQueue(AF_INET, data::ElementPtr());
+        setTransidGenerator(NumberGeneratorPtr(new SequentialGenerator()));
+    } else {
+        // Turn off packet queueing.
+        IfaceMgr::instance().configureDHCPPacketQueue(AF_INET6, data::ElementPtr());
+        setTransidGenerator(NumberGeneratorPtr(new SequentialGenerator(0x00FFFFFF)));
+    }
+
+    uint32_t clients_num = options_.getClientsNum() == 0 ?
+        1 : options_.getClientsNum();
+    setMacAddrGenerator(NumberGeneratorPtr(new SequentialGenerator(clients_num)));
+
+    // Diagnostics are command line options mainly.
+    printDiagnostics();
+    // Option factories have to be registered.
+    registerOptionFactories();
+    // Initialize packet templates.
+    initPacketTemplates();
+    // Initialize randomization seed.
+    if (options_.isSeeded()) {
+        srandom(options_.getSeed());
+    } else {
+        // Seed with current time.
+        time_period duration(from_iso_string("20111231T235959"),
+                             microsec_clock::universal_time());
+        srandom(duration.length().total_seconds()
+                + duration.length().fractional_seconds());
+    }
+    // If user interrupts the program we will exit gracefully.
+    signal(SIGINT, TestControl::handleInterrupt);
+}
+
+void
+TestControl::runWrapped(bool do_stop /*= false */) const {
+    if (!options_.getWrapped().empty()) {
+        pid_t pid = 0;
+        signal(SIGCHLD, handleChild);
+        pid = fork();
+        if (pid < 0) {
+            isc_throw(Unexpected, "unable to fork");
+        } else if (pid == 0) {
+            execlp(options_.getWrapped().c_str(), do_stop ? "stop" : "start", (void*)0);
+        }
+    }
+}
+
+void
+TestControl::saveFirstPacket(const Pkt4Ptr& pkt) {
+    if (options_.testDiags('T')) {
+        if (template_packets_v4_.find(pkt->getType()) == template_packets_v4_.end()) {
+            template_packets_v4_[pkt->getType()] = pkt;
+        }
+    }
+}
+
+void
+TestControl::saveFirstPacket(const Pkt6Ptr& pkt) {
+    if (options_.testDiags('T')) {
+        if (template_packets_v6_.find(pkt->getType()) == template_packets_v6_.end()) {
+            template_packets_v6_[pkt->getType()] = pkt;
+        }
+    }
+}
+
+void
+TestControl::sendDiscover4(const bool preload /*= false*/) {
+    // Generate the MAC address to be passed in the packet.
+    uint8_t randomized = 0;
+    std::vector<uint8_t> mac_address = generateMacAddress(randomized);
+    // Generate transaction id to be set for the new exchange.
+    const uint32_t transid = generateTransid();
+    Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, transid));
+    if (!pkt4) {
+        isc_throw(Unexpected, "failed to create DISCOVER packet");
+    }
+
+    // Delete the default Message Type option set by Pkt4
+    pkt4->delOption(DHO_DHCP_MESSAGE_TYPE);
+
+    // Set options: DHCP_MESSAGE_TYPE and DHCP_PARAMETER_REQUEST_LIST
+    OptionBuffer buf_msg_type;
+    buf_msg_type.push_back(DHCPDISCOVER);
+    pkt4->addOption(Option::factory(Option::V4, DHO_DHCP_MESSAGE_TYPE,
+                                    buf_msg_type));
+    pkt4->addOption(Option::factory(Option::V4,
+                                    DHO_DHCP_PARAMETER_REQUEST_LIST));
+
+
+    // Set client's and server's ports as well as server's address,
+    // and local (relay) address.
+    setDefaults4(pkt4);
+
+    // Set hardware address
+    pkt4->setHWAddr(HTYPE_ETHER, mac_address.size(), mac_address);
+
+    // Set client identifier
+    pkt4->addOption(generateClientId(pkt4->getHWAddr()));
+
+    // Check if we need to simulate HA failures by pretending no responses were received.
+    // The DHCP protocol signals that by increasing secs field (seconds since the configuration attempt started).
+    if (options_.getIncreaseElapsedTime() &&
+        stats_mgr_.getTestPeriod().length().total_seconds() >= options_.getWaitForElapsedTime() &&
+        stats_mgr_.getTestPeriod().length().total_seconds() < options_.getWaitForElapsedTime() +
+                                     options_.getIncreaseElapsedTime()) {
+
+        // Keep increasing elapsed time. The value should start increasing steadily.
+        uint32_t val = stats_mgr_.getTestPeriod().length().total_seconds() - options_.getWaitForElapsedTime() + 1;
+        if (val > 65535) {
+            val = 65535;
+        }
+        pkt4->setSecs(static_cast<uint16_t>(val));
+    }
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt4);
+
+    pkt4->pack();
+    socket_.send(pkt4);
+    if (!preload) {
+        stats_mgr_.passSentPacket(ExchangeType::DO, pkt4);
+    }
+
+    saveFirstPacket(pkt4);
+}
+
+void
+TestControl::sendDiscover4(const std::vector<uint8_t>& template_buf,
+                           const bool preload /* = false */) {
+    // Get the first argument if multiple the same arguments specified
+    // in the command line. First one refers to DISCOVER packets.
+    const uint8_t arg_idx = 0;
+    // Generate the MAC address to be passed in the packet.
+    uint8_t randomized = 0;
+    std::vector<uint8_t> mac_address = generateMacAddress(randomized);
+    // Generate transaction id to be set for the new exchange.
+    const uint32_t transid = generateTransid();
+    // Get transaction id offset.
+    size_t transid_offset = getTransactionIdOffset(arg_idx);
+    // Get randomization offset.
+    // We need to go back by HW_ETHER_LEN (MAC address length)
+    // because this offset points to last octet of MAC address.
+    size_t rand_offset = getRandomOffset(arg_idx) - HW_ETHER_LEN + 1;
+    // Create temporary buffer with template contents. We will
+    // modify this temporary buffer but we don't want to modify
+    // the original template.
+    std::vector<uint8_t> in_buf(template_buf.begin(),
+                                template_buf.end());
+    // Check if we are not going out of bounds.
+    if (rand_offset + HW_ETHER_LEN > in_buf.size()) {
+        isc_throw(OutOfRange, "randomization offset is out of bounds");
+    }
+    PerfPkt4Ptr pkt4(new PerfPkt4(&in_buf[0], in_buf.size(),
+                                  transid_offset,
+                                  transid));
+
+    // Replace MAC address in the template with actual MAC address.
+    pkt4->writeAt(rand_offset, mac_address.begin(), mac_address.end());
+    // Create a packet from the temporary buffer.
+    setDefaults4(boost::static_pointer_cast<Pkt4>(pkt4));
+    // Pack the input packet buffer to output buffer so as it can
+    // be sent to server.
+    pkt4->rawPack();
+    socket_.send(boost::static_pointer_cast<Pkt4>(pkt4));
+    if (!preload) {
+        // Update packet stats.
+        stats_mgr_.passSentPacket(ExchangeType::DO,
+                                    boost::static_pointer_cast<Pkt4>(pkt4));
+    }
+    saveFirstPacket(pkt4);
+}
+
+bool
+TestControl::sendMessageFromAck(const uint16_t msg_type) {
+    // We only permit Request or Release messages to be sent using this
+    // function.
+    if (msg_type != DHCPREQUEST && msg_type != DHCPRELEASE) {
+        isc_throw(isc::BadValue,
+                  "invalid message type "
+                      << msg_type
+                      << " to be sent, expected DHCPREQUEST or DHCPRELEASE");
+    }
+
+    // Get one of the recorded DHCPACK messages.
+    Pkt4Ptr ack = ack_storage_.getRandom();
+    if (!ack) {
+        return (false);
+    }
+
+    // Create message of the specified type.
+    Pkt4Ptr msg = createMessageFromAck(msg_type, ack);
+    setDefaults4(msg);
+
+    // Override relay address
+    msg->setGiaddr(ack->getGiaddr());
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(msg);
+
+    // Pack it.
+    msg->pack();
+
+    // And send it.
+    socket_.send(msg);
+    address4Uniqueness(msg, ExchangeType::RLA);
+    stats_mgr_.passSentPacket((msg_type == DHCPREQUEST ? ExchangeType::RNA :
+                                                         ExchangeType::RLA),
+                              msg);
+    return (true);
+}
+
+
+bool
+TestControl::sendMessageFromReply(const uint16_t msg_type) {
+    // We only permit Release or Renew messages to be sent using this function.
+    if (msg_type != DHCPV6_RENEW && msg_type != DHCPV6_RELEASE) {
+        isc_throw(isc::BadValue, "invalid message type " << msg_type
+                  << " to be sent, expected DHCPV6_RENEW or DHCPV6_RELEASE");
+    }
+
+    // Get one of the recorded DHCPV6_OFFER messages.
+    Pkt6Ptr reply = reply_storage_.getRandom();
+    if (!reply) {
+        return (false);
+    }
+    // Prepare the message of the specified type.
+    Pkt6Ptr msg = createMessageFromReply(msg_type, reply);
+    setDefaults6(msg);
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(msg);
+
+    // Pack it.
+    msg->pack();
+
+    // And send it.
+    socket_.send(msg);
+    address6Uniqueness(msg, ExchangeType::RL);
+    stats_mgr_.passSentPacket((msg_type == DHCPV6_RENEW ? ExchangeType::RN
+                                : ExchangeType::RL), msg);
+    return (true);
+}
+
+void
+TestControl::sendRequest4(const dhcp::Pkt4Ptr& discover_pkt4,
+                          const dhcp::Pkt4Ptr& offer_pkt4) {
+    // Use the same transaction id as the one used in the discovery packet.
+    const uint32_t transid = discover_pkt4->getTransid();
+    Pkt4Ptr pkt4(new Pkt4(DHCPREQUEST, transid));
+
+    // Use first flags indicates that we want to use the server
+    // id captured in first packet.
+    if (options_.isUseFirst() &&
+        (first_packet_serverid_.size() > 0)) {
+        pkt4->addOption(Option::factory(Option::V4, DHO_DHCP_SERVER_IDENTIFIER,
+                                        first_packet_serverid_));
+    } else {
+        OptionPtr opt_serverid =
+            offer_pkt4->getOption(DHO_DHCP_SERVER_IDENTIFIER);
+        if (!opt_serverid) {
+            isc_throw(BadValue, "there is no SERVER_IDENTIFIER option "
+                      << "in OFFER message");
+        }
+        if (stats_mgr_.getRcvdPacketsNum(ExchangeType::DO) == 1) {
+            first_packet_serverid_ = opt_serverid->getData();
+        }
+        pkt4->addOption(opt_serverid);
+    }
+
+    /// Set client address.
+    asiolink::IOAddress yiaddr = offer_pkt4->getYiaddr();
+    if (!yiaddr.isV4()) {
+        isc_throw(BadValue, "the YIADDR returned in OFFER packet is not "
+                  " IPv4 address");
+    }
+    OptionPtr opt_requested_address =
+        OptionPtr(new Option(Option::V4, DHO_DHCP_REQUESTED_ADDRESS,
+                             OptionBuffer()));
+    opt_requested_address->setUint32(yiaddr.toUint32());
+    pkt4->addOption(opt_requested_address);
+    OptionPtr opt_parameter_list =
+        Option::factory(Option::V4, DHO_DHCP_PARAMETER_REQUEST_LIST);
+    pkt4->addOption(opt_parameter_list);
+    // Set client's and server's ports as well as server's address
+    setDefaults4(pkt4);
+    // Override relay address
+    pkt4->setGiaddr(offer_pkt4->getGiaddr());
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt4);
+
+    // Set hardware address
+    pkt4->setHWAddr(offer_pkt4->getHWAddr());
+    // Set client id.
+    pkt4->addOption(generateClientId(pkt4->getHWAddr()));
+    // Set elapsed time.
+    uint32_t elapsed_time = getElapsedTime<Pkt4Ptr>(discover_pkt4, offer_pkt4);
+    pkt4->setSecs(static_cast<uint16_t>(elapsed_time / 1000));
+    // Prepare on wire data to send.
+    pkt4->pack();
+    socket_.send(pkt4);
+    stats_mgr_.passSentPacket(ExchangeType::RA, pkt4);
+    saveFirstPacket(pkt4);
+}
+
+void
+TestControl::sendRequest4(const std::vector<uint8_t>& template_buf,
+                          const dhcp::Pkt4Ptr& discover_pkt4,
+                          const dhcp::Pkt4Ptr& offer_pkt4) {
+    // Get the second argument if multiple the same arguments specified
+    // in the command line. Second one refers to REQUEST packets.
+    const uint8_t arg_idx = 1;
+    // Use the same transaction id as the one used in the discovery packet.
+    const uint32_t transid = discover_pkt4->getTransid();
+    // Get transaction id offset.
+    size_t transid_offset = getTransactionIdOffset(arg_idx);
+    // Get the offset of MAC's last octet.
+    // We need to go back by HW_ETHER_LEN (MAC address length)
+    // because this offset points to last octet of MAC address.
+    size_t rand_offset = getRandomOffset(arg_idx) - HW_ETHER_LEN + 1;
+    // Create temporary buffer from the template.
+    std::vector<uint8_t> in_buf(template_buf.begin(),
+                                template_buf.end());
+    // Check if given randomization offset is not out of bounds.
+    if (rand_offset + HW_ETHER_LEN > in_buf.size()) {
+        isc_throw(OutOfRange, "randomization offset is out of bounds");
+    }
+
+    // Create packet from the temporary buffer.
+    PerfPkt4Ptr pkt4(new PerfPkt4(&in_buf[0], in_buf.size(),
+                                  transid_offset,
+                                  transid));
+
+     // Set hardware address from OFFER packet received.
+    HWAddrPtr hwaddr = offer_pkt4->getHWAddr();
+    std::vector<uint8_t> mac_address(HW_ETHER_LEN, 0);
+    uint8_t hw_len = hwaddr->hwaddr_.size();
+    if (hw_len != 0) {
+        memcpy(&mac_address[0], &hwaddr->hwaddr_[0],
+               hw_len > HW_ETHER_LEN ? HW_ETHER_LEN : hw_len);
+    }
+    pkt4->writeAt(rand_offset, mac_address.begin(), mac_address.end());
+
+    // Set elapsed time.
+    size_t elp_offset = getElapsedTimeOffset();
+    uint32_t elapsed_time = getElapsedTime<Pkt4Ptr>(discover_pkt4, offer_pkt4);
+    pkt4->writeValueAt<uint16_t>(elp_offset,
+                                 static_cast<uint16_t>(elapsed_time / 1000));
+
+    // Get the actual server id offset.
+    size_t sid_offset = getServerIdOffset();
+    // Use first flags indicates that we want to use the server
+    // id captured in first packet.
+    if (options_.isUseFirst() &&
+        (first_packet_serverid_.size() > 0)) {
+        boost::shared_ptr<LocalizedOption>
+            opt_serverid(new LocalizedOption(Option::V4,
+                                             DHO_DHCP_SERVER_IDENTIFIER,
+                                             first_packet_serverid_,
+                                             sid_offset));
+        pkt4->addOption(opt_serverid);
+    } else {
+        // Copy the contents of server identifier received in
+        // OFFER packet to put this into REQUEST.
+        OptionPtr opt_serverid_offer =
+            offer_pkt4->getOption(DHO_DHCP_SERVER_IDENTIFIER);
+        if (!opt_serverid_offer) {
+            isc_throw(BadValue, "there is no SERVER_IDENTIFIER option "
+                      << "in OFFER message");
+        }
+        boost::shared_ptr<LocalizedOption>
+            opt_serverid(new LocalizedOption(Option::V4,
+                                             DHO_DHCP_SERVER_IDENTIFIER,
+                                             opt_serverid_offer->getData(),
+                                             sid_offset));
+        pkt4->addOption(opt_serverid);
+        if (stats_mgr_.getRcvdPacketsNum(ExchangeType::DO) == 1) {
+            first_packet_serverid_ = opt_serverid_offer->getData();
+        }
+    }
+
+    /// Set client address.
+    asiolink::IOAddress yiaddr = offer_pkt4->getYiaddr();
+    if (!yiaddr.isV4()) {
+        isc_throw(BadValue, "the YIADDR returned in OFFER packet is not "
+                  " IPv4 address");
+    }
+
+    // Get the actual offset of requested ip.
+    size_t rip_offset = getRequestedIpOffset();
+    // Place requested IP option at specified position (rip_offset).
+    boost::shared_ptr<LocalizedOption>
+        opt_requested_ip(new LocalizedOption(Option::V4,
+                                             DHO_DHCP_REQUESTED_ADDRESS,
+                                             OptionBuffer(),
+                                             rip_offset));
+    // The IOAddress is convertible to uint32_t and returns exactly what we need.
+    opt_requested_ip->setUint32(yiaddr.toUint32());
+    pkt4->addOption(opt_requested_ip);
+
+    setDefaults4(boost::static_pointer_cast<Pkt4>(pkt4));
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt4);
+
+    // Prepare on-wire data.
+    pkt4->rawPack();
+    socket_.send(boost::static_pointer_cast<Pkt4>(pkt4));
+    // Update packet stats.
+    stats_mgr_.passSentPacket(ExchangeType::RA,
+                               boost::static_pointer_cast<Pkt4>(pkt4));
+    saveFirstPacket(pkt4);
+}
+
+void
+TestControl::sendRequest6(const Pkt6Ptr& advertise_pkt6) {
+    const uint32_t transid = generateTransid();
+    Pkt6Ptr pkt6(new Pkt6(DHCPV6_REQUEST, transid));
+    // Set elapsed time.
+    OptionPtr opt_elapsed_time =
+        Option::factory(Option::V6, D6O_ELAPSED_TIME);
+    pkt6->addOption(opt_elapsed_time);
+    // Set client id.
+    OptionPtr opt_clientid = advertise_pkt6->getOption(D6O_CLIENTID);
+    if (!opt_clientid) {
+        isc_throw(Unexpected, "client id not found in received packet");
+    }
+    pkt6->addOption(opt_clientid);
+
+    // Use first flags indicates that we want to use the server
+    // id captured in first packet.
+    if (options_.isUseFirst() &&
+        (first_packet_serverid_.size() > 0)) {
+        pkt6->addOption(Option::factory(Option::V6, D6O_SERVERID,
+                                        first_packet_serverid_));
+    } else {
+        OptionPtr opt_serverid = advertise_pkt6->getOption(D6O_SERVERID);
+        if (!opt_serverid) {
+            isc_throw(Unexpected, "server id not found in received packet");
+        }
+        if (stats_mgr_.getRcvdPacketsNum(ExchangeType::SA) == 1) {
+            first_packet_serverid_ = opt_serverid->getData();
+        }
+        pkt6->addOption(opt_serverid);
+    }
+
+    // Copy IA_NA or IA_PD option from the Advertise message to the Request
+    // message being sent to the server. This will throw exception if the
+    // option to be copied is not found. Note that this function will copy
+    // one of IA_NA or IA_PD options, depending on the lease-type value
+    // specified in the command line.
+    copyIaOptions(advertise_pkt6, pkt6);
+
+    // Set default packet data.
+    setDefaults6(pkt6);
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt6);
+
+    // Prepare on-wire data.
+    pkt6->pack();
+    socket_.send(pkt6);
+    stats_mgr_.passSentPacket(ExchangeType::RR, pkt6);
+    saveFirstPacket(pkt6);
+}
+
+void
+TestControl::sendRequest6(const std::vector<uint8_t>& template_buf,
+                          const Pkt6Ptr& advertise_pkt6) {
+    // Get the second argument if multiple the same arguments specified
+    // in the command line. Second one refers to REQUEST packets.
+    const uint8_t arg_idx = 1;
+    // Generate transaction id.
+    const uint32_t transid = generateTransid();
+    // Get transaction id offset.
+    size_t transid_offset = getTransactionIdOffset(arg_idx);
+    PerfPkt6Ptr pkt6(new PerfPkt6(&template_buf[0], template_buf.size(),
+                                  transid_offset, transid));
+    // Set elapsed time.
+    size_t elp_offset = getElapsedTimeOffset();
+    boost::shared_ptr<LocalizedOption>
+        opt_elapsed_time(new LocalizedOption(Option::V6, D6O_ELAPSED_TIME,
+                                             OptionBuffer(), elp_offset));
+    pkt6->addOption(opt_elapsed_time);
+
+    // Get the actual server id offset.
+    size_t sid_offset = getServerIdOffset();
+    // Use first flags indicates that we want to use the server
+    // id captured in first packet.
+    if (options_.isUseFirst() &&
+        (first_packet_serverid_.size() > 0)) {
+        boost::shared_ptr<LocalizedOption>
+            opt_serverid(new LocalizedOption(Option::V6,
+                                             D6O_SERVERID,
+                                             first_packet_serverid_,
+                                             sid_offset));
+        pkt6->addOption(opt_serverid);
+
+    } else {
+        // Copy the contents of server identifier received in
+        // ADVERTISE packet to put this into REQUEST.
+        OptionPtr opt_serverid_advertise =
+            advertise_pkt6->getOption(D6O_SERVERID);
+        if (!opt_serverid_advertise) {
+            isc_throw(BadValue, "there is no SERVERID option "
+                      << "in ADVERTISE message");
+        }
+        boost::shared_ptr<LocalizedOption>
+            opt_serverid(new LocalizedOption(Option::V6,
+                                             D6O_SERVERID,
+                                             opt_serverid_advertise->getData(),
+                                             sid_offset));
+        pkt6->addOption(opt_serverid);
+        if (stats_mgr_.getRcvdPacketsNum(ExchangeType::SA) == 1) {
+            first_packet_serverid_ = opt_serverid_advertise->getData();
+        }
+    }
+    // Set IA_NA
+    OptionPtr opt_ia_na_advertise = advertise_pkt6->getOption(D6O_IA_NA);
+    if (!opt_ia_na_advertise) {
+        isc_throw(Unexpected, "DHCPv6 IA_NA option not found in received "
+                  "packet");
+    }
+    size_t addr_offset = getRequestedIpOffset();
+    boost::shared_ptr<LocalizedOption>
+        opt_ia_na(new LocalizedOption(Option::V6, D6O_IA_NA, opt_ia_na_advertise->getData(), addr_offset));
+    if (!opt_ia_na->valid()) {
+        isc_throw(BadValue, "Option IA_NA in advertise packet is invalid");
+    }
+    pkt6->addOption(opt_ia_na);
+    // Set server id.
+    OptionPtr opt_serverid_advertise = advertise_pkt6->getOption(D6O_SERVERID);
+    if (!opt_serverid_advertise) {
+        isc_throw(Unexpected, "DHCPV6 SERVERID option not found in received "
+                  "packet");
+    }
+    size_t srvid_offset = getServerIdOffset();
+    boost::shared_ptr<LocalizedOption>
+        opt_serverid(new LocalizedOption(Option::V6, D6O_SERVERID,
+                                         opt_serverid_advertise->getData(),
+                                         srvid_offset));
+    pkt6->addOption(opt_serverid);
+    // Get randomization offset.
+    size_t rand_offset = getRandomOffset(arg_idx);
+    OptionPtr opt_clientid_advertise = advertise_pkt6->getOption(D6O_CLIENTID);
+    if (!opt_clientid_advertise) {
+        isc_throw(Unexpected, "DHCPV6 CLIENTID option not found in received packet");
+    }
+    rand_offset -= (opt_clientid_advertise->len() - 1);
+    // Set client id.
+    boost::shared_ptr<LocalizedOption>
+        opt_clientid(new LocalizedOption(Option::V6, D6O_CLIENTID,
+                                         opt_clientid_advertise->getData(),
+                                         rand_offset));
+    pkt6->addOption(opt_clientid);
+    // Set default packet data.
+    setDefaults6(pkt6);
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt6);
+
+    // Prepare on wire data.
+    pkt6->rawPack();
+    // Send packet.
+    socket_.send(pkt6);
+    // Update packet stats.
+    stats_mgr_.passSentPacket(ExchangeType::RR, pkt6);
+
+    // When 'T' diagnostics flag is specified it means that user requested
+    // printing packet contents. It will be just one (first) packet which
+    // contents will be printed. Here we check if this packet has been already
+    // collected. If it hasn't we save this packet so as we can print its
+    // contents when test is finished.
+    if (options_.testDiags('T') &&
+        (template_packets_v6_.find(DHCPV6_REQUEST) == template_packets_v6_.end())) {
+        template_packets_v6_[DHCPV6_REQUEST] = pkt6;
+    }
+}
+
+void
+TestControl::sendSolicit6(const bool preload /*= false*/) {
+    // Generate DUID to be passed to the packet
+    uint8_t randomized = 0;
+    std::vector<uint8_t> duid = generateDuid(randomized);
+    // Generate transaction id to be set for the new exchange.
+    const uint32_t transid = generateTransid();
+    Pkt6Ptr pkt6(new Pkt6(DHCPV6_SOLICIT, transid));
+    if (!pkt6) {
+        isc_throw(Unexpected, "failed to create SOLICIT packet");
+    }
+
+    // Check if we need to simulate HA failures by pretending no responses were received.
+    // The DHCPv6 protocol signals that by increasing the elapsed option field. Note it is in 1/100 of a second.
+    if (options_.getIncreaseElapsedTime() &&
+        stats_mgr_.getTestPeriod().length().total_seconds() >= options_.getWaitForElapsedTime() &&
+        stats_mgr_.getTestPeriod().length().total_seconds() < options_.getWaitForElapsedTime() +
+                                     options_.getIncreaseElapsedTime()) {
+
+
+        // Keep increasing elapsed time. The value should start increasing steadily.
+        uint32_t val = (stats_mgr_.getTestPeriod().length().total_seconds() - options_.getWaitForElapsedTime() + 1)*100;
+        if (val > 65535) {
+            val = 65535;
+        }
+        OptionPtr elapsed(new OptionInt<uint16_t>(Option::V6, D6O_ELAPSED_TIME, val));
+        pkt6->addOption(elapsed);
+    } else {
+        pkt6->addOption(Option::factory(Option::V6, D6O_ELAPSED_TIME));
+    }
+
+    if (options_.isRapidCommit()) {
+        pkt6->addOption(Option::factory(Option::V6, D6O_RAPID_COMMIT));
+    }
+    pkt6->addOption(Option::factory(Option::V6, D6O_CLIENTID, duid));
+    pkt6->addOption(Option::factory(Option::V6, D6O_ORO));
+
+
+    // Depending on the lease-type option specified, we should request
+    // IPv6 address (with IA_NA) or IPv6 prefix (IA_PD) or both.
+
+    // IA_NA
+    if (options_.getLeaseType().includes(CommandOptions::LeaseType::ADDRESS)) {
+        pkt6->addOption(Option::factory(Option::V6, D6O_IA_NA));
+    }
+    // IA_PD
+    if (options_.getLeaseType().includes(CommandOptions::LeaseType::PREFIX)) {
+        pkt6->addOption(Option::factory(Option::V6, D6O_IA_PD));
+    }
+
+    setDefaults6(pkt6);
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt6);
+
+    pkt6->pack();
+    socket_.send(pkt6);
+    if (!preload) {
+        stats_mgr_.passSentPacket(ExchangeType::SA, pkt6);
+    }
+
+    saveFirstPacket(pkt6);
+}
+
+void
+TestControl::sendSolicit6(const std::vector<uint8_t>& template_buf,
+                          const bool preload /*= false*/) {
+    const int arg_idx = 0;
+    // Get transaction id offset.
+    size_t transid_offset = getTransactionIdOffset(arg_idx);
+    // Generate transaction id to be set for the new exchange.
+    const uint32_t transid = generateTransid();
+    // Create packet.
+    PerfPkt6Ptr pkt6(new PerfPkt6(&template_buf[0], template_buf.size(),
+                                  transid_offset, transid));
+    if (!pkt6) {
+        isc_throw(Unexpected, "failed to create SOLICIT packet");
+    }
+    size_t rand_offset = getRandomOffset(arg_idx);
+    // randomized will pick number of bytes randomized so we can
+    // just use part of the generated duid and substitute a few bytes
+    /// in template.
+    uint8_t randomized = 0;
+    std::vector<uint8_t> duid = generateDuid(randomized);
+    if (rand_offset > template_buf.size()) {
+        isc_throw(OutOfRange, "randomization offset is out of bounds");
+    }
+    // Store random part of the DUID into the packet.
+    pkt6->writeAt(rand_offset - randomized + 1,
+                  duid.end() - randomized, duid.end());
+
+    // Prepare on-wire data.
+    pkt6->rawPack();
+    setDefaults6(pkt6);
+
+    // Add any extra options that user may have specified.
+    addExtraOpts(pkt6);
+
+    // Send solicit packet.
+    socket_.send(pkt6);
+    if (!preload) {
+        // Update packet stats.
+        stats_mgr_.passSentPacket(ExchangeType::SA, pkt6);
+    }
+    saveFirstPacket(pkt6);
+}
+
+
+void
+TestControl::setDefaults4(const Pkt4Ptr& pkt) {
+    // Interface name.
+    IfacePtr iface = socket_.getIface();
+    if (iface == NULL) {
+        isc_throw(BadValue, "unable to find interface with given index");
+    }
+    pkt->setIface(iface->getName());
+    // Interface index.
+    pkt->setIndex(socket_.ifindex_);
+    // Local client's port (68)
+    pkt->setLocalPort(DHCP4_CLIENT_PORT);
+    // Server's port (67)
+    if (options_.getRemotePort()) {
+        pkt->setRemotePort(options_.getRemotePort());
+    } else {
+        pkt->setRemotePort(DHCP4_SERVER_PORT);
+    }
+    // The remote server's name or IP.
+    pkt->setRemoteAddr(IOAddress(options_.getServerName()));
+    // Set local address.
+    pkt->setLocalAddr(IOAddress(socket_.addr_));
+    // Set relay (GIADDR) address to local address if multiple
+    // subnet mode is not enabled
+    if (!options_.checkMultiSubnet()) {
+        pkt->setGiaddr(IOAddress(socket_.addr_));
+    } else {
+        pkt->setGiaddr(IOAddress(options_.getRandRelayAddr()));
+    }
+    // Pretend that we have one relay (which is us).
+    pkt->setHops(1);
+}
+
+void
+TestControl::setDefaults6(const Pkt6Ptr& pkt) {
+    // Interface name.
+    IfacePtr iface = socket_.getIface();
+    if (iface == NULL) {
+        isc_throw(BadValue, "unable to find interface with given index");
+    }
+    pkt->setIface(iface->getName());
+    // Interface index.
+    pkt->setIndex(socket_.ifindex_);
+    // Local client's port (547)
+    pkt->setLocalPort(DHCP6_CLIENT_PORT);
+    // Server's port (548)
+    if (options_.getRemotePort()) {
+        pkt->setRemotePort(options_.getRemotePort());
+    } else {
+        pkt->setRemotePort(DHCP6_SERVER_PORT);
+    }
+    // Set local address.
+    pkt->setLocalAddr(socket_.addr_);
+    // The remote server's name or IP.
+    pkt->setRemoteAddr(IOAddress(options_.getServerName()));
+
+    // only act as a relay agent when told so.
+    /// @todo: support more level of encapsulation, at the moment we only support
+    /// one, via -A1 option.
+    if (options_.isUseRelayedV6()) {
+      Pkt6::RelayInfo relay_info;
+      relay_info.msg_type_ = DHCPV6_RELAY_FORW;
+      relay_info.hop_count_ = 0;
+      if (options_.checkMultiSubnet()) {
+          relay_info.linkaddr_ = IOAddress(options_.getRandRelayAddr());
+      } else {
+          relay_info.linkaddr_ = IOAddress(socket_.addr_);
+      }
+      relay_info.peeraddr_ = IOAddress(socket_.addr_);
+      relay_info.options_.insert(options_.getRelayOpts().begin(), options_.getRelayOpts().end());
+      pkt->addRelayInfo(relay_info);
+    }
+}
+
+namespace {
+
+static OptionBuffer const concatenateBuffers(OptionBuffer const& a,
+                                             OptionBuffer const& b) {
+    OptionBuffer result;
+    result.insert(result.end(), a.begin(), a.end());
+    result.insert(result.end(), b.begin(), b.end());
+    return result;
+}
+
+static void mergeOptionIntoPacket(Pkt4Ptr const& packet,
+                                  OptionPtr const& extra_option) {
+    uint16_t const code(extra_option->getType());
+    // If option already exists...
+    OptionPtr const& option(packet->getOption(code));
+    if (option) {
+        switch (code) {
+        // List here all the options for which we want to concatenate buffers.
+        case DHO_DHCP_PARAMETER_REQUEST_LIST:
+            packet->delOption(code);
+            packet->addOption(boost::make_shared<Option>(
+                Option::V4, code,
+                concatenateBuffers(option->getData(),
+                                   extra_option->getData())));
+            return;
+        default:
+            // For all others, add option as usual, it will result in "Option
+            // already present in this message" error.
+            break;
+        }
+    }
+    packet->addOption(extra_option);
+}
+
+}  // namespace
+
+void
+TestControl::addExtraOpts(const Pkt4Ptr& pkt) {
+    // Add all extra options that the user may have specified.
+    const dhcp::OptionCollection& extra_opts = options_.getExtraOpts();
+    for (auto entry : extra_opts) {
+        mergeOptionIntoPacket(pkt, entry.second);
+    }
+}
+
+void
+TestControl::addExtraOpts(const Pkt6Ptr& pkt) {
+    // Add all extra options that the user may have specified.
+    const dhcp::OptionCollection& extra_opts = options_.getExtraOpts();
+    for (auto entry : extra_opts) {
+        pkt->addOption(entry.second);
+    }
+}
+
+}  // namespace perfdhcp
+}  // namespace isc
diff --git a/src/bin/perfdhcp/test_control.h b/src/bin/perfdhcp/test_control.h
new file mode 100644
index 0000000..17700ce
--- /dev/null
+++ b/src/bin/perfdhcp/test_control.h
@@ -0,0 +1,1116 @@
+// Copyright (C) 2012-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef TEST_CONTROL_H
+#define TEST_CONTROL_H
+
+#include <perfdhcp/packet_storage.h>
+#include <perfdhcp/rate_control.h>
+#include <perfdhcp/stats_mgr.h>
+#include <perfdhcp/receiver.h>
+#include <perfdhcp/command_options.h>
+#include <perfdhcp/perf_socket.h>
+#include <perfdhcp/random_number_generator.h>
+
+#include <dhcp/iface_mgr.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+#include <string>
+#include <vector>
+#include <unordered_map>
+
+namespace isc {
+namespace perfdhcp {
+
+/// Default transaction id offset in the packet template.
+static const size_t DHCPV4_TRANSID_OFFSET = 4;
+/// Default offset of MAC's last octet in the packet template..
+static const size_t DHCPV4_RANDOMIZATION_OFFSET = 35;
+/// Default elapsed time offset in the packet template.
+static const size_t DHCPV4_ELAPSED_TIME_OFFSET = 8;
+/// Default server id offset in the packet template.
+static const size_t DHCPV4_SERVERID_OFFSET = 54;
+/// Default requested ip offset in the packet template.
+static const size_t DHCPV4_REQUESTED_IP_OFFSET = 240;
+/// Default DHCPV6 transaction id offset in t the packet template.
+static const size_t DHCPV6_TRANSID_OFFSET = 1;
+/// Default DHCPV6 randomization offset (last octet of DUID)
+/// in the packet template.
+static const size_t DHCPV6_RANDOMIZATION_OFFSET = 21;
+/// Default DHCPV6 elapsed time offset in the packet template.
+static const size_t DHCPV6_ELAPSED_TIME_OFFSET = 84;
+/// Default DHCPV6 server id offset in the packet template.
+static const size_t DHCPV6_SERVERID_OFFSET = 22;
+/// Default DHCPV6 IA_NA offset in the packet template.
+static const size_t DHCPV6_IA_NA_OFFSET = 40;
+
+/// \brief Test Control class.
+///
+/// This class is used to run the performance test with
+/// with \ref TestControl::runWrapped function. This function can be executed
+/// multiple times if desired because it resets TestControl's internal
+/// state every time it is executed. Prior to running \ref TestControl::runWrapped,
+/// one must make sure to parse command line options by calling
+/// \ref CommandOptions::parse. Failing to do this will result in an exception.
+///
+/// The following major stages of the test are performed by this class:
+/// - set default transaction id and MAC address generators - the generator
+/// is an object of \ref TestControl::NumberGenerator type and it provides
+/// the custom randomization algorithms,
+/// - print command line arguments,
+/// - register option factory functions which are used to generate DHCP options
+/// being sent to a server,
+/// - create the socket for communication with a server,
+/// - read packet templates if user specified template files with '-T' command
+/// line option,
+/// - set the interrupt handler (invoked when ^C is pressed) which makes
+/// perfdhcp stop gracefully and print the test results before exiting,
+/// - executes an external command (if specified '-w' option), e.g. if user
+/// specified -w ./foo in the command line then program will execute
+/// "./foo start" at the beginning of the test and "./foo stop" when the test
+/// ends,
+/// - initialize the Statistics Manager,
+/// - executes the main loop:
+///   - calculate how many packets must be send to satisfy desired rate,
+///   - receive incoming packets from the server,
+///   - check the exit conditions - terminate the program if the exit criteria
+///   are fulfilled, e.g. reached maximum number of packet drops,
+///   - send the number of packets appropriate to satisfy the desired rate,
+///   - optionally print intermediate reports,
+/// - print statistics, e.g. achieved rate,
+/// - optionally print some diagnostics.
+///
+/// With the '-w' command line option user may specify the external application
+/// or script to be executed. This is executed twice, first when the test starts
+/// and second time when the test ends. This external script or application must
+/// accept 'start' and 'stop' arguments. The first time it is called, it is
+/// called with the argument 'start' and the second time with the argument
+/// 'stop'.
+///
+/// The application is executed by calling fork() to fork the current perfdhcp
+/// process and then call execlp() to replace the current process image with
+/// the new one.
+///
+/// Option factory functions are registered using
+/// \ref dhcp::LibDHCP::OptionFactoryRegister. Registered factory functions
+/// provide a way to create options of the same type in the same way.
+///  When a new option instance is needed, the corresponding factory
+/// function is called to create it. This is done by calling
+/// \ref dhcp::Option::factory with DHCP message type specified as one of
+///  parameters. Some of the parameters passed to factory function
+/// may be ignored (e.g. option buffer).
+/// Please note that naming convention for factory functions within this
+/// class is as follows:
+/// - factoryABC4 - factory function for DHCPv4 option,
+/// - factoryDEF6 - factory function for DHCPv6 option,
+/// - factoryGHI - factory function that can be used to create either
+/// DHCPv4 or DHCPv6 option.
+class TestControl : public boost::noncopyable {
+public:
+    /// \brief Default constructor.
+    TestControl(CommandOptions& options, BasePerfSocket& socket);
+
+    /// Packet template buffer.
+    typedef std::vector<uint8_t> TemplateBuffer;
+    /// Packet template buffers list.
+    typedef std::vector<TemplateBuffer> TemplateBufferCollection;
+
+    /// @brief Delay the exit by a fixed given time to catch up to all exchanges
+    ///     that were already started.
+    /// @return true if need to wait, false = ok to exit now
+    bool waitToExit();
+
+    /// @brief Checks if all expected packets were already received
+    bool haveAllPacketsBeenReceived() const;
+
+    /// \brief Number generator class.
+    ///
+    /// This is default numbers generator class. The member function is
+    /// used to generate uint32_t values. Other generator classes should
+    /// derive from this one to implement generation algorithms
+    /// (e.g. sequential or based on random function).
+    class NumberGenerator {
+    public:
+
+        /// \brief Destructor.
+        virtual ~NumberGenerator() { }
+
+        /// \brief Generate number.
+        ///
+        /// \return Generate number.
+        virtual uint32_t generate() = 0;
+    };
+
+    /// The default generator pointer.
+    typedef boost::shared_ptr<NumberGenerator> NumberGeneratorPtr;
+
+    /// \brief Sequential numbers generator class.
+    class SequentialGenerator : public NumberGenerator {
+    public:
+        /// \brief Constructor.
+        ///
+        /// \param range maximum number generated. If 0 is given then
+        /// range defaults to maximum uint32_t value.
+        SequentialGenerator(uint32_t range = 0xFFFFFFFF) :
+            NumberGenerator(),
+            num_(0),
+            range_(range) {
+            if (range_ == 0) {
+                range_ = 0xFFFFFFFF;
+            }
+        }
+
+        /// \brief Generate number sequentially.
+        ///
+        /// \return generated number.
+        virtual uint32_t generate() {
+            uint32_t num = num_;
+            num_ = (num_ + 1) % range_;
+            return (num);
+        }
+    private:
+        uint32_t num_;   ///< Current number.
+        uint32_t range_; ///< Number of unique numbers generated.
+    };
+
+    /// \brief Length of the Ethernet HW address (MAC) in bytes.
+    ///
+    /// \todo Make this variable length as there are cases when HW
+    /// address is longer than this (e.g. 20 bytes).
+    static const uint8_t HW_ETHER_LEN = 6;
+
+    /// \brief Set new transaction id generator.
+    ///
+    /// \param generator generator object to be used.
+    void setTransidGenerator(const NumberGeneratorPtr& generator) {
+        transid_gen_.reset();
+        transid_gen_ = generator;
+    }
+
+    /// \brief Set new MAC address generator.
+    ///
+    /// Set numbers generator that will be used to generate various
+    /// MAC addresses to simulate number of clients.
+    ///
+    /// \param generator object to be used.
+    void setMacAddrGenerator(const NumberGeneratorPtr& generator) {
+        macaddr_gen_.reset();
+        macaddr_gen_ = generator;
+    }
+
+    /// \brief Removes cached DHCPv6 Reply packets every second.
+    ///
+    /// This function wipes cached Reply packets from the storage.
+    /// The number of packets left in the storage after the call
+    /// to this function should guarantee that the Renew packets
+    /// can be sent at the given rate. Note that the Renew packets
+    /// are generated for the existing leases, represented here as
+    /// replies from the server.
+    /// @todo Instead of cleaning packets periodically we could
+    /// just stop adding new packets when the certain threshold
+    /// has been reached.
+    void cleanCachedPackets();
+
+    /// \brief Get interrupted flag.
+    bool interrupted() const { return interrupted_; }
+
+    /// \brief Get stats manager.
+    StatsMgr& getStatsMgr() { return stats_mgr_; };
+
+    /// \brief Start receiver.
+    void start() { receiver_.start(); }
+
+    /// \brief Stop receiver.
+    void stop() { receiver_.stop(); }
+
+    /// \brief Run wrapped command.
+    ///
+    /// \param do_stop execute wrapped command with "stop" argument.
+    void runWrapped(bool do_stop = false) const;
+
+    /// \brief Get received server id flag.
+    bool serverIdReceived() const { return first_packet_serverid_.size() > 0; }
+
+    /// \brief Get received server id.
+    std::string getServerId() const { return vector2Hex(first_packet_serverid_); }
+
+    /// \brief Send number of packets to initiate new exchanges.
+    ///
+    /// Method initiates the new DHCP exchanges by sending number
+    /// of DISCOVER (DHCPv4) or SOLICIT (DHCPv6) packets. If preload
+    /// mode was requested sent packets will not be counted in
+    /// the statistics. The responses from the server will be
+    /// received and counted as orphans because corresponding sent
+    /// packets are not included in StatsMgr for match.
+    /// When preload mode is disabled and diagnostics flag 'i' is
+    /// specified then function will be trying to receive late packets
+    /// before new packets are sent to the server. Statistics of
+    /// late received packets is updated accordingly.
+    ///
+    /// \todo do not count responses in preload mode as orphans.
+    ///
+    /// \param packets_num number of packets to be sent.
+    /// \param preload preload mode, packets not included in statistics.
+    /// \throw isc::Unexpected if thrown by packet sending method.
+    /// \throw isc::InvalidOperation if thrown by packet sending method.
+    /// \throw isc::OutOfRange if thrown by packet sending method.
+    void sendPackets(const uint64_t packets_num,
+                     const bool preload = false);
+
+    /// \brief Send number of DHCPREQUEST (renew) messages to a server.
+    ///
+    /// \param msg_type A type of the messages to be sent (DHCPREQUEST or
+    /// DHCPRELEASE).
+    /// \param msg_num A number of messages to be sent.
+    ///
+    /// \return A number of messages actually sent.
+    uint64_t sendMultipleMessages4(const uint32_t msg_type,
+                                   const uint64_t msg_num);
+
+    /// \brief Send number of DHCPv6 Renew or Release messages to the server.
+    ///
+    /// \param msg_type A type of the messages to be sent (DHCPV6_RENEW or
+    /// DHCPV6_RELEASE).
+    /// \param msg_num A number of messages to be sent.
+    ///
+    /// \return A number of messages actually sent.
+    uint64_t sendMultipleMessages6(const uint32_t msg_type,
+                                   const uint64_t msg_num);
+
+    /// \brief Pull packets from receiver and process them.
+    ///
+    /// It runs in a loop until there are no packets in receiver.
+    unsigned int consumeReceivedPackets();
+
+    /// \brief Print intermediate statistics.
+    ///
+    /// Print brief statistics regarding number of sent packets,
+    /// received packets and dropped packets so far.
+    void printIntermediateStats();
+
+    /// \brief Print performance statistics.
+    ///
+    /// Method prints performance statistics.
+    /// \throws isc::InvalidOperation if Statistics Manager was
+    /// not initialized.
+    void printStats() const;
+
+    /// \brief Print templates information.
+    ///
+    /// Method prints information about data offsets
+    /// in packet templates and their contents.
+    void printTemplates() const;
+
+    /// \brief Get set of unique replied addresses.
+    std::set<std::string>& getAllUniqueAddrReply() {
+        return unique_reply_address_;
+    }
+
+    /// \brief Get set of unique advertised addresses.
+    std::set<std::string>& getAllUniqueAddrAdvert() {
+        return unique_address_;
+    }
+
+    /// \brief Convert binary value to hex string.
+    ///
+    /// \todo Consider moving this function to src/lib/util.
+    ///
+    /// \param b byte to convert.
+    /// \return hex string.
+    static std::string byte2Hex(const uint8_t b);
+
+    /// \brief Convert vector in hexadecimal string.
+    ///
+    /// \todo Consider moving this function to src/lib/util.
+    ///
+    /// \param vec vector to be converted.
+    /// \param separator separator.
+    static std::string vector2Hex(const std::vector<uint8_t>& vec,
+                                  const std::string& separator = "");
+
+    /// \brief Initialized at first exit condition with the time perfdhcp
+    ///  should exit
+    boost::posix_time::ptime exit_time_;
+
+    // We would really like following methods and members to be private but
+    // they have to be accessible for unit-testing. Another, possibly better,
+    // solution is to make this class friend of test class but this is not
+    // what's followed in other classes.
+protected:
+    /// Generate uniformly distributed integers in range of [min, max]
+    UniformRandomIntegerGenerator number_generator_;
+
+    /// \brief Creates DHCPREQUEST from a DHCPACK message.
+    ///
+    /// @param msg_type the message type to be created (DHCPREQUEST or DHCPRELEASE)
+    /// \param ack An instance of the DHCPACK message to be used to
+    /// create a new message.
+    ///
+    /// \return Pointer to the created message.
+    dhcp::Pkt4Ptr createMessageFromAck(const uint16_t msg_type,
+                                       const dhcp::Pkt4Ptr& ack);
+
+    /// \brief Creates DHCPv6 message from the Reply packet.
+    ///
+    /// This function creates DHCPv6 Renew or Release message using the
+    /// data from the Reply message by copying options from the Reply
+    /// message.
+    ///
+    /// \param msg_type A type of the message to be created.
+    /// \param reply An instance of the Reply packet which contents should
+    /// be used to create an instance of the new message.
+    ///
+    /// \return created Release or Renew message
+    /// \throw isc::BadValue if the msg_type is neither DHCPV6_RENEW nor
+    /// DHCPV6_RELEASE or if the reply is NULL.
+    /// \throw isc::Unexpected if mandatory options are missing in the
+    /// Reply message.
+    dhcp::Pkt6Ptr createMessageFromReply(const uint16_t msg_type,
+                                         const dhcp::Pkt6Ptr& reply);
+
+    /// \brief Factory function to create DHCPv6 ELAPSED_TIME option.
+    ///
+    /// This factory function creates DHCPv6 ELAPSED_TIME option instance.
+    /// If empty buffer is passed the option buffer will be initialized
+    /// to length 2 and values will be initialized to zeros. Otherwise
+    /// function will initialize option buffer with values in passed buffer.
+    ///
+    /// \param u universe (ignored)
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer containing option content (2 bytes) or
+    /// empty buffer if option content has to be set to default (0) value.
+    /// \throw if elapsed time buffer size is neither 2 nor 0.
+    /// \return instance o the option.
+    static dhcp::OptionPtr
+    factoryElapsedTime6(dhcp::Option::Universe u,
+                        uint16_t type,
+                        const dhcp::OptionBuffer& buf);
+
+    /// \brief Factory function to create generic option.
+    ///
+    /// This factory function creates option with specified universe,
+    /// type and buf. It does not have any additional logic validating
+    /// the buffer contents, size  etc.
+    ///
+    /// \param u universe (V6 or V4).
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer.
+    /// \return instance o the option.
+    static dhcp::OptionPtr factoryGeneric(dhcp::Option::Universe u,
+                                          uint16_t type,
+                                          const dhcp::OptionBuffer& buf);
+
+    /// \brief Factory function to create IA_NA option.
+    ///
+    /// This factory function creates DHCPv6 IA_NA option instance.
+    ///
+    /// \todo add support for IA Address options.
+    ///
+    /// \param u universe (ignored).
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer carrying IANA suboptions.
+    /// \return instance of IA_NA option.
+    static dhcp::OptionPtr factoryIana6(dhcp::Option::Universe u,
+                                        uint16_t type,
+                                        const dhcp::OptionBuffer& buf);
+
+    /// \brief Factory function to create IA_PD option.
+    ///
+    /// this factory function creates DHCPv6 IA_PD option instance.
+    ///
+    /// \param u universe (ignored).
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer carrying sub-options.
+    static dhcp::OptionPtr factoryIapd6(dhcp::Option::Universe u,
+                                        uint16_t type,
+                                        const dhcp::OptionBuffer& buf);
+
+    /// \brief Factory function to create DHCPv6 ORO option.
+    ///
+    /// This factory function creates DHCPv6 Option Request Option instance.
+    /// The created option will contain the following set of requested options:
+    /// - D6O_NAME_SERVERS
+    /// - D6O_DOMAIN_SEARCH
+    ///
+    /// \param u universe (ignored).
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer (ignored).
+    /// \return instance of ORO option.
+    static dhcp::OptionPtr
+    factoryOptionRequestOption6(dhcp::Option::Universe u,
+                                uint16_t type,
+                                const dhcp::OptionBuffer& buf);
+
+    /// \brief Factory function to create DHCPv6 RAPID_COMMIT option instance.
+    ///
+    /// This factory function creates DHCPv6 RAPID_COMMIT option instance.
+    /// The buffer passed to this option must be empty because option does
+    /// not have any payload.
+    ///
+    /// \param u universe (ignored).
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer (ignored).
+    /// \return instance of RAPID_COMMIT option..
+    static dhcp::OptionPtr factoryRapidCommit6(dhcp::Option::Universe u,
+                                               uint16_t type,
+                                               const dhcp::OptionBuffer& buf);
+
+
+    /// \brief Factory function to create DHCPv4 Request List option.
+    ///
+    /// This factory function creates DHCPv4 PARAMETER_REQUEST_LIST option
+    /// instance with the following set of requested options:
+    /// - DHO_SUBNET_MASK,
+    /// - DHO_BROADCAST_ADDRESS,
+    /// - DHO_TIME_OFFSET,
+    /// - DHO_ROUTERS,
+    /// - DHO_DOMAIN_NAME,
+    /// - DHO_DOMAIN_NAME_SERVERS,
+    /// - DHO_HOST_NAME.
+    ///
+    /// \param u universe (ignored).
+    /// \param type option-type (ignored).
+    /// \param buf option-buffer (ignored).
+    /// \return instance o the generic option.
+    static dhcp::OptionPtr factoryRequestList4(dhcp::Option::Universe u,
+                                               uint16_t type,
+                                               const dhcp::OptionBuffer& buf);
+
+    /// \brief Generate DHCPv4 client identifier from HW address.
+    ///
+    /// This method generates DHCPv4 client identifier option from a
+    /// HW address.
+    ///
+    /// \param hwaddr HW address.
+    ///
+    /// \return Pointer to an instance of the generated option.
+    dhcp::OptionPtr generateClientId(const dhcp::HWAddrPtr& hwaddr) const;
+
+    /// \brief Generate DUID.
+    ///
+    /// Method generates unique DUID. The number of DUIDs it can generate
+    /// depends on the number of simulated clients, which is specified
+    /// from the command line. It uses \ref CommandOptions object to retrieve
+    /// number of clients. Since the last six octets of DUID are constructed
+    /// from the MAC address, this function uses \ref generateMacAddress
+    /// internally to randomize the DUID.
+    ///
+    /// \todo add support for other types of DUID.
+    ///
+    /// \param [out] randomized number of bytes randomized (initial value
+    /// is ignored).
+    /// \throw isc::BadValue if \ref generateMacAddress throws.
+    /// \return vector representing DUID.
+    std::vector<uint8_t> generateDuid(uint8_t& randomized);
+
+    /// \brief Generate MAC address.
+    ///
+    /// This method generates MAC address. The number of unique
+    /// MAC addresses it can generate is determined by the number
+    /// simulated DHCP clients specified from command line. It uses
+    /// \ref CommandOptions object to retrieve number of clients.
+    /// Based on this the random value is generated and added to
+    /// the MAC address template (default MAC address).
+    ///
+    /// \param [out] randomized number of bytes randomized (initial
+    /// value is ignored).
+    /// \throw isc::BadValue if MAC address template (default or specified
+    /// from the command line) has invalid size (expected 6 octets).
+    /// \return generated MAC address.
+    std::vector<uint8_t> generateMacAddress(uint8_t& randomized);
+
+    /// \brief generate transaction id.
+    ///
+    /// Generate transaction id value (32-bit for DHCPv4,
+    /// 24-bit for DHCPv6).
+    ///
+    /// \return generated transaction id.
+    uint32_t generateTransid() {
+        return (transid_gen_->generate());
+    }
+
+    /// \brief Return template buffer.
+    ///
+    /// Method returns template buffer at specified index.
+    ///
+    /// \param idx index of template buffer.
+    /// \throw isc::OutOfRange if buffer index out of bounds.
+    /// \return reference to template buffer.
+    TemplateBuffer getTemplateBuffer(const size_t idx) const;
+
+    /// \brief Reads packet templates from files.
+    ///
+    /// Method iterates through all specified template files, reads
+    /// their content and stores it in class internal buffers. Template
+    /// file names are specified from the command line with -T option.
+    ///
+    /// \throw isc::BadValue if any of the template files does not exist,
+    /// contains characters other than hexadecimal digits or spaces.
+    /// \throw OutOfRange if any of the template files is empty or has
+    /// odd number of hexadecimal digits.
+    void initPacketTemplates();
+
+    /// \brief Print rate statistics.
+    ///
+    /// Method print packet exchange rate statistics.
+    void printRate() const;
+
+    /// \brief Process received DHCPv4 packet.
+    ///
+    /// Method performs processing of the received DHCPv4 packet,
+    /// updates statistics and responds to the server if required,
+    /// e.g. when OFFER packet arrives, this function will initiate
+    /// REQUEST message to the server.
+    ///
+    /// \warning this method does not check if provided socket is
+    /// valid (specifically if v4 socket for received v4 packet).
+    ///
+    /// \param [in] pkt4 object representing DHCPv4 packet received.
+    /// \throw isc::BadValue if unknown message type received.
+    /// \throw isc::Unexpected if unexpected error occurred.
+    void processReceivedPacket4(const dhcp::Pkt4Ptr& pkt4);
+
+    /// \brief Process IA in received DHCPv6 packet.
+    ///
+    /// Process IA in received message to check if it contain proper
+    /// address and/or prefix
+    ///
+    /// \param [in] pkt6 object representing DHCPv6 packet received.
+    /// \return true if the message include correct IA, false otherwise.
+    bool validateIA(const dhcp::Pkt6Ptr& pkt6);
+
+    /// \brief Process received v6 addresses uniqueness.
+    ///
+    /// Generate list of addresses and check for uniqueness.
+    ///
+    /// \param pkt6 object representing received DHCPv6 packet
+    /// \param xchg_type ExchangeType enum value.
+    void address6Uniqueness(const dhcp::Pkt6Ptr& pkt6, ExchangeType xchg_type);
+
+    /// \brief Process received v4 addresses uniqueness.
+    ///
+    /// Generate list of addresses and check for uniqueness.
+    ///
+    /// \param pkt4 object representing received DHCPv4 packet
+    /// \param xchg_type ExchangeType enum value.
+    void address4Uniqueness(const dhcp::Pkt4Ptr& pkt4, ExchangeType xchg_type);
+
+    /// \brief add unique address to already assigned list.
+    ///
+    /// Add address and/or prefix to unique set if it's not already there,
+    /// otherwise increment the number of non unique addresses.
+    ///
+    /// \param current set of addresses that should be added to unique list
+    /// \param xchg_type ExchangeType enum value.
+    void addUniqeAddr(const std::set<std::string>& current, ExchangeType xchg_type) {
+        switch(xchg_type) {
+            case ExchangeType::SA: {
+                for (auto current_it = current.begin();
+                     current_it != current.end(); ++current_it) {
+                    // addresses should be unique cross packets
+                    auto ret = unique_address_.emplace(*current_it);
+                    if (!ret.second) {
+                        stats_mgr_.updateNonUniqueAddrNum(ExchangeType::SA);
+                    }
+                }
+                break;
+            }
+            case ExchangeType::RR: {
+                for (auto current_it = current.begin();
+                     current_it != current.end(); ++current_it) {
+                    // addresses should be unique cross packets
+                    auto ret = unique_reply_address_.emplace(*current_it);
+                    if (!ret.second) {
+                        stats_mgr_.updateNonUniqueAddrNum(ExchangeType::RR);
+                    }
+                }
+                break;
+            }
+            case ExchangeType::RLA:
+            case ExchangeType::RL: {
+                removeUniqueAddr(current);
+                break;
+            }
+            case ExchangeType::DO: {
+                for (auto current_it = current.begin();
+                     current_it != current.end(); ++current_it) {
+                    // addresses should be unique cross packets
+                    auto ret = unique_address_.emplace(*current_it);
+                    if (!ret.second) {
+                        stats_mgr_.updateNonUniqueAddrNum(ExchangeType::DO);
+                    }
+                }
+                break;
+            }
+            case ExchangeType::RA: {
+                for (auto current_it = current.begin();
+                     current_it != current.end(); ++current_it) {
+                    // addresses should be unique cross packets
+                    auto ret = unique_reply_address_.emplace(*current_it);
+                    if (!ret.second) {
+                        stats_mgr_.updateNonUniqueAddrNum(ExchangeType::RA);
+                    }
+                }
+                break;
+            }
+            case ExchangeType::RNA:
+            case ExchangeType::RN:
+            default:
+                break;
+        }
+    }
+
+    /// \brief remove unique address from list.
+    ///
+    /// If address is released we should remove it from both
+    /// advertised (offered) and assigned sets.
+    ///
+    /// \param addr holding value of unique address.
+    void removeUniqueAddr(const std::set<std::string>& addr) {
+        for (auto addr_it = addr.begin(); addr_it != addr.end(); ++addr_it) {
+            auto it = unique_address_.find(*addr_it);
+            if (it != unique_address_.end()) {
+                unique_address_.erase(it);
+            }
+
+            auto it2 = unique_reply_address_.find(*addr_it);
+            if (it2 != unique_reply_address_.end()) {
+                unique_reply_address_.erase(it2);
+            }
+        }
+    }
+
+    /// \brief Process received DHCPv6 packet.
+    ///
+    /// Method performs processing of the received DHCPv6 packet,
+    /// updates statistics and responds to the server if required,
+    /// e.g. when ADVERTISE packet arrives, this function will initiate
+    /// REQUEST message to the server.
+    ///
+    /// \param [in] pkt6 object representing DHCPv6 packet received.
+    /// \throw isc::BadValue if unknown message type received.
+    /// \throw isc::Unexpected if unexpected error occurred.
+    void processReceivedPacket6(const dhcp::Pkt6Ptr& pkt6);
+
+    /// \brief Register option factory functions for DHCPv4.
+    ///
+    /// Method registers option factory functions for DHCPv4.
+    /// These functions are called to create instances of DHCPv4
+    /// options. Call \ref dhcp::Option::factory to invoke factory
+    /// function for particular option. Don't use this function directly.
+    /// Use \ref registerOptionFactories instead.
+    void registerOptionFactories4() const;
+
+    /// \brief Register option factory functions for DHCPv6.
+    ///
+    /// Method registers option factory functions for DHCPv6.
+    /// These functions are called to create instances of DHCPv6
+    /// options. Call \ref dhcp::Option::factory to invoke factory
+    /// function for particular option. Don't use this function directly.
+    /// Use \ref registerOptionFactories instead.
+    void registerOptionFactories6() const;
+
+    /// \brief Register option factory functions for DHCPv4 or DHCPv6.
+    ///
+    /// Method registers option factory functions for DHCPv4 or DHCPv6,
+    /// depending in which mode test is currently running.
+    void registerOptionFactories() const;
+
+    /// \brief Resets internal state of the object.
+    ///
+    /// Method resets internal state of the object. It has to be
+    /// called before new test is started.
+    void reset();
+
+    /// \brief Save the first DHCPv4 sent packet of the specified type.
+    ///
+    /// This method saves first packet of the specified being sent
+    /// to the server if user requested diagnostics flag 'T'. In
+    /// such case program has to print contents of selected packets
+    /// being sent to the server. It collects first packets of each
+    /// type and keeps them around until test finishes. Then they
+    /// are printed to the user. If packet of specified type has
+    /// been already stored this function performs no operation.
+    /// This function does not perform sanity check if packet
+    /// pointer is valid. Make sure it is before calling it.
+    ///
+    /// \param pkt packet to be stored.
+    inline void saveFirstPacket(const dhcp::Pkt4Ptr& pkt);
+
+    /// \brief Save the first DHCPv6 sent packet of the specified type.
+    ///
+    /// This method saves first packet of the specified being sent
+    /// to the server if user requested diagnostics flag 'T'. In
+    /// such case program has to print contents of selected packets
+    /// being sent to the server. It collects first packets of each
+    /// type and keeps them around until test finishes. Then they
+    /// are printed to the user. If packet of specified type has
+    /// been already stored this function performs no operation.
+    /// This function does not perform sanity check if packet
+    /// pointer is valid. Make sure it is before calling it.
+    ///
+    /// \param pkt packet to be stored.
+    inline void saveFirstPacket(const dhcp::Pkt6Ptr& pkt);
+
+    /// \brief Send DHCPv4 DISCOVER message.
+    ///
+    /// Method creates and sends DHCPv4 DISCOVER message to the server
+    /// with the following options:
+    /// - MESSAGE_TYPE set to DHCPDISCOVER
+    /// - PARAMETER_REQUEST_LIST with the same list of requested options
+    /// as described in \ref factoryRequestList4.
+    /// The transaction id and MAC address are randomly generated for
+    /// the message. Range of unique MAC addresses generated depends
+    /// on the number of clients specified from the command line.
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param preload preload mode, packets not included in statistics.
+    ///
+    /// \throw isc::Unexpected if failed to create new packet instance.
+    /// \throw isc::BadValue if MAC address has invalid length.
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendDiscover4(const bool preload = false);
+
+    /// \brief Send DHCPv4 DISCOVER message from template.
+    ///
+    /// Method sends DHCPv4 DISCOVER message from template. The
+    /// template data is expected to be in binary format. Provided
+    /// buffer is copied and parts of it are replaced with actual
+    /// data (e.g. MAC address, transaction id etc.).
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param template_buf buffer holding template packet.
+    /// \param preload preload mode, packets not included in statistics.
+    ///
+    /// \throw isc::OutOfRange if randomization offset is out of bounds.
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendDiscover4(const std::vector<uint8_t>& template_buf,
+                       const bool preload = false);
+
+    /// \brief Send DHCPv4 renew (DHCPREQUEST).
+    ///
+    /// \param msg_type A type of the message to be sent (DHCPREQUEST or
+    /// DHCPRELEASE).
+    ///
+    /// \return true if the message has been sent, false otherwise.
+    bool sendMessageFromAck(const uint16_t msg_type);
+
+    /// \brief Send DHCPv6 Renew or Release message.
+    ///
+    /// This method will select an existing lease from the Reply packet cache
+    /// If there is no lease that can be renewed or released this method will
+    /// return false.
+    ///
+    /// \param msg_type A type of the message to be sent (DHCPV6_RENEW or
+    /// DHCPV6_RELEASE).
+    ///
+    /// \return true if the message has been sent, false otherwise.
+    bool sendMessageFromReply(const uint16_t msg_type);
+
+    /// \brief Send DHCPv4 REQUEST message.
+    ///
+    /// Method creates and sends DHCPv4 REQUEST message to the server.
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param discover_pkt4 DISCOVER packet sent.
+    /// \param offer_pkt4 OFFER packet object.
+    ///
+    /// \throw isc::Unexpected if unexpected error occurred.
+    /// \throw isc::InvalidOperation if Statistics Manager has not been
+    /// initialized.
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendRequest4(const dhcp::Pkt4Ptr& discover_pkt4,
+                      const dhcp::Pkt4Ptr& offer_pkt4);
+
+    /// \brief Send DHCPv4 REQUEST message from template.
+    ///
+    /// Method sends DHCPv4 REQUEST message from template.
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param template_buf buffer holding template packet.
+    /// \param discover_pkt4 DISCOVER packet sent.
+    /// \param offer_pkt4 OFFER packet received.
+    ///
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendRequest4(const std::vector<uint8_t>& template_buf,
+                      const dhcp::Pkt4Ptr& discover_pkt4,
+                      const dhcp::Pkt4Ptr& offer_pkt4);
+
+    /// \brief Send DHCPv6 REQUEST message.
+    ///
+    /// Method creates and sends DHCPv6 REQUEST message to the server
+    /// with the following options:
+    /// - D6O_ELAPSED_TIME
+    /// - D6O_CLIENTID
+    /// - D6O_SERVERID
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param advertise_pkt6 ADVERTISE packet object.
+    /// \throw isc::Unexpected if unexpected error occurred.
+    /// \throw isc::InvalidOperation if Statistics Manager has not been
+    /// initialized.
+    ///
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendRequest6(const dhcp::Pkt6Ptr& advertise_pkt6);
+
+    /// \brief Send DHCPv6 REQUEST message from template.
+    ///
+    /// Method sends DHCPv6 REQUEST message from template.
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param template_buf packet template buffer.
+    /// \param advertise_pkt6 ADVERTISE packet object.
+    ///
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendRequest6(const std::vector<uint8_t>& template_buf,
+                      const dhcp::Pkt6Ptr& advertise_pkt6);
+
+    /// \brief Send DHCPv6 SOLICIT message.
+    ///
+    /// Method creates and sends DHCPv6 SOLICIT message to the server
+    /// with the following options:
+    /// - D6O_ELAPSED_TIME,
+    /// - D6O_RAPID_COMMIT if rapid commit is requested in command line,
+    /// - D6O_CLIENTID,
+    /// - D6O_ORO (Option Request Option),
+    /// - D6O_IA_NA.
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param preload mode, packets not included in statistics.
+    ///
+    /// \throw isc::Unexpected if failed to create new packet instance.
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendSolicit6(const bool preload = false);
+
+    /// \brief Send DHCPv6 SOLICIT message from template.
+    ///
+    /// Method sends DHCPv6 SOLICIT message from template.
+    /// Copy of sent packet is stored in the stats_mgr_ object to
+    /// update statistics.
+    ///
+    /// \param template_buf packet template buffer.
+    /// \param preload mode, packets not included in statistics.
+    ///
+    /// \throw isc::dhcp::SocketWriteError if failed to send the packet.
+    void sendSolicit6(const std::vector<uint8_t>& template_buf,
+                      const bool preload = false);
+
+    /// \brief Set default DHCPv4 packet parameters.
+    ///
+    /// This method sets default parameters on the DHCPv4 packet:
+    /// - interface name,
+    /// - local port = 68 (DHCP client port),
+    /// - remote port = 67 (DHCP server port),
+    /// - server's address,
+    /// - GIADDR = local address where socket is bound to,
+    /// - hops = 1 (pretending that we are a relay)
+    ///
+    /// \param pkt reference to packet to be configured.
+    void setDefaults4(const dhcp::Pkt4Ptr& pkt);
+
+    /// \brief Set default DHCPv6 packet parameters.
+    ///
+    /// This method sets default parameters on the DHCPv6 packet:
+    /// - interface name,
+    /// - interface index,
+    /// - local port,
+    /// - remote port,
+    /// - local address,
+    /// - remote address (server).
+    ///
+    /// \param pkt reference to packet to be configured.
+    void setDefaults6(const dhcp::Pkt6Ptr& pkt);
+
+    /// @brief Inserts extra options specified by user.
+    ///
+    /// Note: addExtraOpts for v4 and v6 could easily be turned into a template.
+    /// However, this would require putting code here that uses CommandOptions,
+    /// and that would create dependency between test_control.h and
+    /// command_options.h.
+    ///
+    /// @param pkt4 options will be added here.
+    void addExtraOpts(const dhcp::Pkt4Ptr& pkt4);
+
+    /// @brief Inserts extra options specified by user.
+    ///
+    /// Note: addExtraOpts for v4 and v6 could easily be turned into a template.
+    /// However, this would require putting code here that uses CommandOptions,
+    /// and that would create dependency between test_control.h and
+    /// command_options.h.
+    ///
+    /// @param pkt6 options will be added here.
+    void addExtraOpts(const dhcp::Pkt6Ptr& pkt6);
+
+    /// \brief Copies IA_NA or IA_PD option from one packet to another.
+    ///
+    /// This function checks the lease-type specified in the command line
+    /// with option -e<lease-type>. If 'address-only' value has been specified
+    /// this function expects that IA_NA option is present in the packet
+    /// encapsulated by pkt_from object. If 'prefix-only' value has been
+    /// specified, this function expects that IA_PD option is present in the
+    /// packet encapsulated by pkt_to object.
+    ///
+    /// \param [in] pkt_from A packet from which options should be copied.
+    /// \param [out] pkt_to A packet to which options should be copied.
+    ///
+    /// \throw isc::NotFound if a required option is not found in the
+    /// packet from which options should be copied.
+    /// \throw isc::BadValue if any of the specified pointers to packets
+    /// is NULL.
+    void copyIaOptions(const dhcp::Pkt6Ptr& pkt_from, dhcp::Pkt6Ptr& pkt_to);
+
+    /// \brief Calculate elapsed time between two packets.
+    ///
+    /// This function calculates the time elapsed between two packets. If
+    /// the timestamp of the pkt2 is greater than timestamp of the pkt1,
+    /// the positive value is returned. If the pkt2 timestamp is equal or
+    /// less than pkt1 timestamp, 0 is returned.
+    ///
+    /// \tparam T Pkt4Ptr or Pkt6Ptr class.
+    /// \param pkt1 first packet.
+    /// \param pkt2 second packet.
+    /// \throw InvalidOperation if packet timestamps are invalid.
+    /// \return elapsed time in milliseconds between pkt1 and pkt2.
+    template<class T>
+    uint32_t getElapsedTime(const T& pkt1, const T& pkt2);
+
+    /// \brief Return elapsed time offset in a packet.
+    ///
+    /// \return elapsed time offset in packet.
+    int getElapsedTimeOffset() const;
+
+    /// \brief Return randomization offset in a packet.
+    ///
+    /// \return randomization offset in packet.
+    int getRandomOffset(const int arg_idx) const;
+
+    /// \brief Return requested ip offset in a packet.
+    ///
+    /// \return randomization offset in a packet.
+    int getRequestedIpOffset() const;
+
+    /// \brief Return server id offset in a packet.
+    ///
+    /// \return server id offset in packet.
+    int getServerIdOffset() const;
+
+    /// \brief Return transaction id offset in a packet.
+    ///
+    /// \param arg_idx command line argument index to be used.
+    /// If multiple -X parameters specified it points to the
+    /// one to be used.
+    /// \return transaction id offset in packet.
+    int getTransactionIdOffset(const int arg_idx) const;
+
+    /// \brief Handle child signal.
+    ///
+    /// Function handles child signal by waiting for
+    /// the process to complete.
+    ///
+    /// \param sig signal (ignored).
+    static void handleChild(int sig);
+
+    /// \brief Handle interrupt signal.
+    ///
+    /// Function sets flag indicating that program has been
+    /// interrupted.
+    ///
+    /// \param sig signal (ignored).
+    static void handleInterrupt(int sig);
+
+    /// \brief Print main diagnostics data.
+    ///
+    /// Method prints main diagnostics data.
+    void printDiagnostics() const;
+
+    /// \brief Print template information.
+    ///
+    /// \param packet_type packet type.
+    void printTemplate(const uint8_t packet_type) const;
+
+    /// \brief Read DHCP message template from file.
+    ///
+    /// Method reads DHCP message template from file and
+    /// converts it to binary format. Read data is appended
+    /// to template_buffers_ vector.
+    ///
+    /// \param file_name name of the packet template file.
+    /// \throw isc::OutOfRange if file is empty or has odd number
+    /// of hexadecimal digits.
+    /// \throw isc::BadValue if file contains characters other than
+    /// spaces or hexadecimal digits.
+    void readPacketTemplate(const std::string& file_name);
+
+    /// \brief Keep addresses and prefixes from advertise msg for uniqueness checks.
+    std::set<std::string> unique_address_;
+
+    /// \brief Keep addresses and prefixes from reply msg for uniqueness checks.
+    std::set<std::string> unique_reply_address_;
+
+    /// \brief Socket used for DHCP traffic.
+    BasePerfSocket &socket_;
+
+    /// \brief Receiver used to receive DHCP traffic.
+    Receiver receiver_;
+
+    /// \brief Last intermediate report time.
+    boost::posix_time::ptime last_report_;
+
+    /// \brief Statistics Manager.
+    StatsMgr stats_mgr_;
+
+    /// \brief Storage for DHCPACK messages.
+    PacketStorage<dhcp::Pkt4> ack_storage_;
+
+    /// \brief Storage for reply messages.
+    PacketStorage<dhcp::Pkt6> reply_storage_;
+
+    /// \brief Transaction id generator.
+    NumberGeneratorPtr transid_gen_;
+
+    /// \brief Numbers generator for MAC address.
+    NumberGeneratorPtr macaddr_gen_;
+
+    /// \brief Buffer holding server id received in first packet
+    dhcp::OptionBuffer first_packet_serverid_;
+
+    /// \brief Packet template buffers.
+    TemplateBufferCollection template_buffers_;
+
+    /// First packets send. They are used at the end of the test
+    /// to print packet templates when diagnostics flag T is specified.
+
+    /// \brief Template for v4.
+    std::map<uint8_t, dhcp::Pkt4Ptr> template_packets_v4_;
+
+    /// \brief Template for v6.
+    std::map<uint8_t, dhcp::Pkt6Ptr> template_packets_v6_;
+
+    /// \brief Program interrupted flag.
+    static bool interrupted_;
+
+    /// \brief Command options.
+    CommandOptions& options_;
+};
+
+}  // namespace perfdhcp
+}  // namespace isc
+
+#endif // TEST_CONTROL_H
diff --git a/src/bin/perfdhcp/tests/Makefile.am b/src/bin/perfdhcp/tests/Makefile.am
new file mode 100644
index 0000000..4de5e30
--- /dev/null
+++ b/src/bin/perfdhcp/tests/Makefile.am
@@ -0,0 +1,58 @@
+SUBDIRS = . testdata
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -I$(top_builddir)/src/bin  -I$(top_srcdir)/src/bin
+AM_CPPFLAGS += -I$(srcdir)/.. -I$(builddir)/..
+AM_CPPFLAGS += -DTEST_DATA_DIR=\"$(abs_srcdir)/testdata\"
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+# The test[1-5].hex are created by the TestControl.PacketTemplates
+# unit tests and have to be removed.
+CLEANFILES += test1.hex test2.hex test3.hex test4.hex test5.hex
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES  = run_unittests.cc
+run_unittests_SOURCES += command_options_unittest.cc
+run_unittests_SOURCES += perf_pkt6_unittest.cc
+run_unittests_SOURCES += perf_pkt4_unittest.cc
+run_unittests_SOURCES += localized_option_unittest.cc
+run_unittests_SOURCES += packet_storage_unittest.cc
+run_unittests_SOURCES += rate_control_unittest.cc
+run_unittests_SOURCES += stats_mgr_unittest.cc
+run_unittests_SOURCES += test_control_unittest.cc
+run_unittests_SOURCES += receiver_unittest.cc
+run_unittests_SOURCES += perf_socket_unittest.cc
+run_unittests_SOURCES += basic_scen_unittest.cc
+run_unittests_SOURCES += avalanche_scen_unittest.cc
+run_unittests_SOURCES += command_options_helper.h
+run_unittests_SOURCES += random_number_generator_unittest.cc
+
+run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+run_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
+
+run_unittests_LDADD  = $(top_builddir)/src/bin/perfdhcp/libperfdhcp.la
+run_unittests_LDADD += $(top_builddir)/src/lib/process/libkea-process.la
+run_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+run_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+run_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+run_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+run_unittests_LDADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+run_unittests_LDADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
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+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/run_unittests-avalanche_scen_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-basic_scen_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-command_options_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-localized_option_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-packet_storage_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-perf_pkt4_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-perf_pkt6_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-perf_socket_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-random_number_generator_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-rate_control_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-receiver_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-stats_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-test_control_unittest.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/bin/perfdhcp/tests/avalanche_scen_unittest.cc b/src/bin/perfdhcp/tests/avalanche_scen_unittest.cc
new file mode 100644
index 0000000..d2e119a
--- /dev/null
+++ b/src/bin/perfdhcp/tests/avalanche_scen_unittest.cc
@@ -0,0 +1,323 @@
+// Copyright (C) 2012-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "command_options_helper.h"
+#include "../avalanche_scen.h"
+
+#include <asiolink/io_address.h>
+#include <exceptions/exceptions.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcp/option6_iaaddr.h>
+#include <dhcp/option6_iaprefix.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/foreach.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <stdint.h>
+#include <string>
+#include <fstream>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+/// \brief FakeAvalancheScenPerfSocket class that mocks PerfSocket.
+///
+/// It stubs send and receive operations and collects statistics.
+/// Beside that it simulates DHCP server responses for received
+/// packets.
+class FakeAvalancheScenPerfSocket: public BasePerfSocket {
+public:
+    /// \brief Default constructor for FakeAvalancheScenPerfSocket.
+    FakeAvalancheScenPerfSocket(CommandOptions &opt) :
+        opt_(opt),
+        iface_(boost::make_shared<Iface>("fake", 0)),
+        sent_cnt_(0),
+        recv_cnt_(0),
+        initial_drops_cnt_(0) {};
+
+    CommandOptions &opt_;
+
+    IfacePtr iface_;  ///< Local fake interface.
+
+    int sent_cnt_;  ///< Counter of sent packets.
+    int recv_cnt_;  ///< Counter of received packets.
+    int initial_drops_cnt_;
+
+    /// List of pairs <msg_type, trans_id> containing responses
+    /// planned to send to perfdhcp.
+    std::list<std::tuple<uint8_t, uint32_t>> planned_responses_;
+
+    /// \brief Simulate receiving DHCPv4 packet.
+    virtual dhcp::Pkt4Ptr receive4(uint32_t timeout_sec, uint32_t timeout_usec) override {
+        (void)timeout_sec; // silence compile 'unused parameter' warning;
+        (void)timeout_usec; // silence compile 'unused parameter' warning;
+        recv_cnt_++;
+
+        if (planned_responses_.empty()) {
+            return Pkt4Ptr();
+        }
+
+        // simulate initial drops
+        if (initial_drops_cnt_ > 0) {
+            planned_responses_.pop_front();
+            initial_drops_cnt_--;
+            return(Pkt4Ptr());
+        }
+
+        // prepare received packet
+        auto msg = planned_responses_.front();
+        planned_responses_.pop_front();
+        auto msg_type = std::get<0>(msg);
+        Pkt4Ptr pkt(new Pkt4(msg_type, std::get<1>(msg)));
+        OptionPtr opt_serverid = Option::factory(Option::V4,
+                                                 DHO_DHCP_SERVER_IDENTIFIER,
+                                                 OptionBuffer(4, 1));
+        pkt->setYiaddr(asiolink::IOAddress("127.0.0.1"));
+        pkt->addOption(opt_serverid);
+        pkt->updateTimestamp();
+        return (pkt);
+    };
+
+    /// \brief Simulate receiving DHCPv6 packet.
+    virtual dhcp::Pkt6Ptr receive6(uint32_t timeout_sec, uint32_t timeout_usec) override {
+        (void)timeout_sec; // silence compile 'unused parameter' warning;
+        (void)timeout_usec; // silence compile 'unused parameter' warning;
+        recv_cnt_++;
+
+        if (planned_responses_.empty()) {
+            return Pkt6Ptr();
+        }
+
+        // simulate initial drops
+        if (initial_drops_cnt_ > 0) {
+            planned_responses_.pop_front();
+            initial_drops_cnt_--;
+            return(Pkt6Ptr());
+        }
+
+        // prepare received packet
+        auto msg = planned_responses_.front();
+        planned_responses_.pop_front();
+        auto msg_type = std::get<0>(msg);
+        Pkt6Ptr pkt(new Pkt6(msg_type, std::get<1>(msg)));
+        // Add IA_NA if requested by the client.
+        if (opt_.getLeaseType().includes(CommandOptions::LeaseType::ADDRESS)) {
+            OptionPtr opt_ia_na = Option::factory(Option::V6, D6O_IA_NA);
+            OptionPtr iaaddr(new Option6IAAddr(D6O_IAADDR, isc::asiolink::IOAddress("fe80::abcd"), 300, 500));
+            opt_ia_na->addOption(iaaddr);
+            pkt->addOption(opt_ia_na);
+        }
+        // Add IA_PD if requested by the client.
+        if (opt_.getLeaseType().includes(CommandOptions::LeaseType::PREFIX)) {
+            OptionPtr opt_ia_pd = Option::factory(Option::V6, D6O_IA_PD);
+            OptionPtr iapref(new Option6IAPrefix(D6O_IAPREFIX, isc::asiolink::IOAddress("fe80::"), 64, 300, 500));
+            opt_ia_pd->addOption(iapref);
+            pkt->addOption(opt_ia_pd);
+        }
+        OptionPtr opt_serverid(new Option(Option::V6, D6O_SERVERID));
+        std::vector<uint8_t> duid({0, 1, 2, 3, 4, 5, 6, 7, 8, 9});
+        OptionPtr opt_clientid(Option::factory(Option::V6, D6O_CLIENTID, duid));
+        pkt->addOption(opt_serverid);
+        pkt->addOption(opt_clientid);
+        pkt->updateTimestamp();
+        return (pkt);
+    };
+
+    /// \brief Simulate sending DHCPv4 packet.
+    virtual bool send(const dhcp::Pkt4Ptr& pkt) override {
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        if (pkt->getType() == DHCPDISCOVER) {
+            planned_responses_.push_back(std::make_tuple(DHCPOFFER, pkt->getTransid()));
+        } else if (pkt->getType() == DHCPREQUEST) {
+            planned_responses_.push_back(std::make_tuple(DHCPACK, pkt->getTransid()));
+        } else {
+            assert(0);
+        }
+        return true;
+    };
+
+    /// \brief Simulate sending DHCPv6 packet.
+    virtual bool send(const dhcp::Pkt6Ptr& pkt) override {
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        if (pkt->getType() == DHCPV6_SOLICIT) {
+            planned_responses_.push_back(std::make_tuple(DHCPV6_ADVERTISE, pkt->getTransid()));
+        } else if (pkt->getType() == DHCPV6_REQUEST) {
+            planned_responses_.push_back(std::make_tuple(DHCPV6_REPLY, pkt->getTransid()));
+        } else {
+            assert(0);
+        }
+        return true;
+    };
+
+    /// \brief Override getting interface.
+    virtual IfacePtr getIface() override { return iface_; }
+
+    void reset() {
+        sent_cnt_ = 0;
+        recv_cnt_ = 0;
+    }
+};
+
+
+/// \brief NakedAvalancheScen class.
+///
+/// It exposes AvalancheScen internals for UT.
+class NakedAvalancheScen: public AvalancheScen {
+public:
+    using AvalancheScen::tc_;
+    using AvalancheScen::total_resent_;
+
+    FakeAvalancheScenPerfSocket fake_sock_;
+
+    NakedAvalancheScen(CommandOptions &opt) : AvalancheScen(opt, fake_sock_), fake_sock_(opt) {};
+
+};
+
+
+/// \brief Test Fixture Class
+///
+/// This test fixture class is used to perform
+/// unit tests on perfdhcp AvalancheScenTest class.
+class AvalancheScenTest : public virtual ::testing::Test
+{
+public:
+    AvalancheScenTest() { }
+
+    /// \brief Parse command line string with CommandOptions.
+    ///
+    /// \param cmdline command line string to be parsed.
+    /// \throw isc::Unexpected if unexpected error occurred.
+    /// \throw isc::InvalidParameter if command line is invalid.
+    void processCmdLine(CommandOptions &opt, const std::string& cmdline) const {
+        CommandOptionsHelper::process(opt, cmdline);
+    }
+
+    /// \brief Get full path to a file in testdata directory.
+    ///
+    /// \param filename filename being appended to absolute
+    /// path to testdata directory
+    ///
+    /// \return full path to a file in testdata directory.
+    std::string getFullPath(const std::string& filename) const {
+        std::ostringstream stream;
+        stream << TEST_DATA_DIR << "/" << filename;
+        return (stream.str());
+    }
+};
+
+
+TEST_F(AvalancheScenTest, Packet4Exchange) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -4 -R 10 --scenario avalanche -g single 127.0.0.1");
+    NakedAvalancheScen as(opt);
+
+    as.run();
+
+    // Check if basic exchange of packets happened. No retransmissions expected.
+    EXPECT_EQ(as.total_resent_, 0);
+    EXPECT_EQ(as.fake_sock_.sent_cnt_, 20); // Discovery + Request
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::DO), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RA), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RA), 10);
+}
+
+
+TEST_F(AvalancheScenTest, Packet4ExchangeOnlyDO) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -4 -R 10 -i --scenario avalanche -g single 127.0.0.1");
+    NakedAvalancheScen as(opt);
+
+    as.run();
+
+    // Check if DO exchange of packets happened only. No retransmissions expected.
+    EXPECT_EQ(as.total_resent_, 0);
+    EXPECT_EQ(as.fake_sock_.sent_cnt_, 10); // Discovery + Request
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::DO), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 10);
+    EXPECT_THROW(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RA), isc::BadValue);
+}
+
+
+TEST_F(AvalancheScenTest, Packet4ExchangeWithRetransmissions) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -4 -R 10 --scenario avalanche -g single 127.0.0.1");
+    NakedAvalancheScen as(opt);
+
+    as.fake_sock_.initial_drops_cnt_ = 2;
+    as.run();
+
+    // Check if basic exchange of packets happened. No retransmissions expected.
+    EXPECT_EQ(as.total_resent_, 2);
+    EXPECT_EQ(as.fake_sock_.sent_cnt_, 22); // Discovery + Request
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::DO), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RA), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RA), 10);
+}
+
+
+TEST_F(AvalancheScenTest, Packet6Exchange) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -6 -R 10 --scenario avalanche -g single ::1");
+    NakedAvalancheScen as(opt);
+
+    as.run();
+
+    // Check if basic exchange of packets happened. No retransmissions expected.
+    EXPECT_EQ(as.total_resent_, 0);
+    EXPECT_GE(as.fake_sock_.sent_cnt_, 20); // Solicit + Request
+    EXPECT_GE(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::SA), 10);
+    EXPECT_GE(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 10);
+    EXPECT_GE(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RR), 10);
+    EXPECT_GE(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RR), 10);
+}
+
+
+TEST_F(AvalancheScenTest, Packet6ExchangeOnlySA) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -6 -R 10 -i --scenario avalanche -g single ::1");
+    NakedAvalancheScen as(opt);
+
+    as.run();
+
+    // Check if SA exchange of packets happened only. No retransmissions expected.
+    EXPECT_EQ(as.total_resent_, 0);
+    EXPECT_GE(as.fake_sock_.sent_cnt_, 10); // Solicit + Request
+    EXPECT_GE(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::SA), 10);
+    EXPECT_GE(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 10);
+    EXPECT_THROW(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RR), isc::BadValue);
+}
+
+
+TEST_F(AvalancheScenTest, Packet6ExchangeWithRetransmissions) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -6 -R 10 --scenario avalanche -g single ::1");
+    NakedAvalancheScen as(opt);
+
+    as.fake_sock_.initial_drops_cnt_ = 2;
+    as.run();
+
+    // Check if basic exchange of packets happened. No retransmissions expected.
+    EXPECT_EQ(as.total_resent_, 2);
+    EXPECT_EQ(as.fake_sock_.sent_cnt_, 22); // Discovery + Request
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::SA), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RR), 10);
+    EXPECT_EQ(as.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RR), 10);
+}
diff --git a/src/bin/perfdhcp/tests/basic_scen_unittest.cc b/src/bin/perfdhcp/tests/basic_scen_unittest.cc
new file mode 100644
index 0000000..5240293
--- /dev/null
+++ b/src/bin/perfdhcp/tests/basic_scen_unittest.cc
@@ -0,0 +1,364 @@
+// Copyright (C) 2012-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "command_options_helper.h"
+#include "../basic_scen.h"
+
+#include <asiolink/io_address.h>
+#include <exceptions/exceptions.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcp/option6_iaaddr.h>
+#include <dhcp/option6_iaprefix.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/foreach.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <stdint.h>
+#include <string>
+#include <fstream>
+#include <mutex>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+/// \brief FakeScenPerfSocket class that mocks PerfSocket.
+///
+/// It stubs send and receive operations and collects statistics.
+/// Beside that it simulates DHCP server responses for received
+/// packets.
+class FakeScenPerfSocket: public BasePerfSocket {
+public:
+    /// \brief Default constructor for FakeScenPerfSocket.
+    FakeScenPerfSocket(CommandOptions &opt) :
+        opt_(opt),
+        iface_(boost::make_shared<Iface>("fake", 0)),
+        sent_cnt_(0),
+        recv_cnt_(0),
+        start_dropping_after_cnt_(100000) {};
+
+    CommandOptions &opt_;
+
+    IfacePtr iface_;  ///< Local fake interface.
+
+    int sent_cnt_;  ///< Counter of sent packets.
+    int recv_cnt_;  ///< Counter of received packets.
+
+    /// List of pairs <msg_type, trans_id> containing responses
+    /// planned to send to perfdhcp.
+    std::list<std::tuple<uint8_t, uint32_t>> planned_responses_;
+
+    /// Mutex to protect internal state.
+    std::mutex mutex_;
+
+    /// Limit for sent packets. After this limit not more packets
+    /// are sent. This simulate dropping responses.
+    int start_dropping_after_cnt_;
+
+    /// \brief Simulate receiving DHCPv4 packet.
+    virtual dhcp::Pkt4Ptr receive4(uint32_t /*timeout_sec*/, uint32_t /*timeout_usec*/) override {
+        std::lock_guard<std::mutex> lock(mutex_);
+        recv_cnt_++;
+
+        if (planned_responses_.empty() || sent_cnt_ >= start_dropping_after_cnt_) {
+            return Pkt4Ptr();
+        }
+        auto msg = planned_responses_.front();
+        planned_responses_.pop_front();
+        auto msg_type = std::get<0>(msg);
+        Pkt4Ptr pkt(new Pkt4(msg_type, std::get<1>(msg)));
+        OptionPtr opt_serverid = Option::factory(Option::V4,
+                                                 DHO_DHCP_SERVER_IDENTIFIER,
+                                                 OptionBuffer(4, 1));
+        pkt->setYiaddr(asiolink::IOAddress("127.0.0.1"));
+        pkt->addOption(opt_serverid);
+        pkt->updateTimestamp();
+        return (pkt);
+    };
+
+    /// \brief Simulate receiving DHCPv6 packet.
+    virtual dhcp::Pkt6Ptr receive6(uint32_t /*timeout_sec*/, uint32_t /*timeout_usec*/) override {
+        std::lock_guard<std::mutex> lock(mutex_);
+        recv_cnt_++;
+
+        if (planned_responses_.empty() || sent_cnt_ >= start_dropping_after_cnt_) {
+            return Pkt6Ptr();
+        }
+        auto msg = planned_responses_.front();
+        planned_responses_.pop_front();
+        auto msg_type = std::get<0>(msg);
+        Pkt6Ptr pkt(new Pkt6(msg_type, std::get<1>(msg)));
+        // Add IA_NA if requested by the client.
+        if (opt_.getLeaseType().includes(CommandOptions::LeaseType::ADDRESS)) {
+            OptionPtr opt_ia_na = Option::factory(Option::V6, D6O_IA_NA);
+            OptionPtr iaaddr(new Option6IAAddr(D6O_IAADDR,
+                             isc::asiolink::IOAddress("fe80::abcd"), 300, 500));
+            opt_ia_na->addOption(iaaddr);
+            pkt->addOption(opt_ia_na);
+        }
+        // Add IA_PD if requested by the client.
+        if (opt_.getLeaseType().includes(CommandOptions::LeaseType::PREFIX)) {
+            OptionPtr opt_ia_pd = Option::factory(Option::V6, D6O_IA_PD);
+            OptionPtr iapref(new Option6IAPrefix(D6O_IAPREFIX,
+                             isc::asiolink::IOAddress("fe80::"), 64, 300, 500));
+            opt_ia_pd->addOption(iapref);
+            pkt->addOption(opt_ia_pd);
+        }
+        OptionPtr opt_serverid(new Option(Option::V6, D6O_SERVERID));
+        std::vector<uint8_t> duid({0, 1, 2, 3, 4, 5, 6, 7, 8, 9});
+        OptionPtr opt_clientid(Option::factory(Option::V6, D6O_CLIENTID, duid));
+        pkt->addOption(opt_serverid);
+        pkt->addOption(opt_clientid);
+        pkt->updateTimestamp();
+        return (pkt);
+    };
+
+    /// \brief Simulate sending DHCPv4 packet.
+    virtual bool send(const dhcp::Pkt4Ptr& pkt) override {
+        std::lock_guard<std::mutex> lock(mutex_);
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        if (sent_cnt_ >= start_dropping_after_cnt_) {
+            return true;
+        }
+        if (pkt->getType() == DHCPDISCOVER) {
+            planned_responses_.push_back(std::make_tuple(DHCPOFFER, pkt->getTransid()));
+        } else if (pkt->getType() == DHCPREQUEST) {
+            planned_responses_.push_back(std::make_tuple(DHCPACK, pkt->getTransid()));
+        } else {
+            assert(0);
+        }
+        return true;
+    };
+
+    /// \brief Simulate sending DHCPv6 packet.
+    virtual bool send(const dhcp::Pkt6Ptr& pkt) override {
+        std::lock_guard<std::mutex> lock(mutex_);
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        if (sent_cnt_ >= start_dropping_after_cnt_) {
+            return true;
+        }
+        if (pkt->getType() == DHCPV6_SOLICIT) {
+            planned_responses_.push_back(std::make_tuple(DHCPV6_ADVERTISE, pkt->getTransid()));
+        } else if (pkt->getType() == DHCPV6_REQUEST) {
+            planned_responses_.push_back(std::make_tuple(DHCPV6_REPLY, pkt->getTransid()));
+        } else {
+            assert(0);
+        }
+        return true;
+    };
+
+    /// \brief Override getting interface.
+    virtual IfacePtr getIface() override { return iface_; }
+
+    void reset() {
+        std::lock_guard<std::mutex> lock(mutex_);
+        sent_cnt_ = 0;
+        recv_cnt_ = 0;
+    }
+};
+
+
+/// \brief NakedBasicScen class.
+///
+/// It exposes BasicScen internals for UT.
+class NakedBasicScen: public BasicScen {
+public:
+    using BasicScen::basic_rate_control_;
+    using BasicScen::renew_rate_control_;
+    using BasicScen::release_rate_control_;
+    using BasicScen::tc_;
+
+    FakeScenPerfSocket fake_sock_;
+
+    NakedBasicScen(CommandOptions &opt) : BasicScen(opt, fake_sock_), fake_sock_(opt) {};
+
+};
+
+
+/// \brief Test Fixture Class
+///
+/// This test fixture class is used to perform
+/// unit tests on perfdhcp BasicScenTest class.
+class BasicScenTest : public virtual ::testing::Test
+{
+public:
+    BasicScenTest() { }
+
+    /// \brief Parse command line string with CommandOptions.
+    ///
+    /// \param cmdline command line string to be parsed.
+    /// \throw isc::Unexpected if unexpected error occurred.
+    /// \throw isc::InvalidParameter if command line is invalid.
+    void processCmdLine(CommandOptions &opt, const std::string& cmdline) const {
+        CommandOptionsHelper::process(opt, cmdline);
+    }
+
+    /// \brief Get full path to a file in testdata directory.
+    ///
+    /// \param filename filename being appended to absolute
+    /// path to testdata directory
+    ///
+    /// \return full path to a file in testdata directory.
+    std::string getFullPath(const std::string& filename) const {
+        std::ostringstream stream;
+        stream << TEST_DATA_DIR << "/" << filename;
+        return (stream.str());
+    }
+};
+
+
+// This test verifies that the class members are reset to expected values.
+TEST_F(BasicScenTest, initial_settings) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -6 -l ethx -r 50 -f 30 -F 10 all");
+    NakedBasicScen bs(opt);
+
+    EXPECT_EQ(50, bs.basic_rate_control_.getRate());
+    EXPECT_EQ(30, bs.renew_rate_control_.getRate());
+    EXPECT_EQ(10, bs.release_rate_control_.getRate());
+}
+
+
+TEST_F(BasicScenTest, Packet4Exchange) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -r 100 -n 10 -g single 127.0.0.1");
+    NakedBasicScen bs(opt);
+    bs.run();
+    // The command line restricts the number of iterations to 10
+    // with -n 10 parameter.
+    EXPECT_GE(bs.fake_sock_.sent_cnt_, 20); // Discovery + Request
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::DO), 10);
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 10);
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RA), 10);
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RA), 10);
+}
+
+TEST_F(BasicScenTest, Address4Unique) {
+    // send more than 1 discover+request but with the same address
+    // counter of a unique addresses should be 1
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -u -l fake -r 10 -n 10 -g single 127.0.0.1");
+    NakedBasicScen bs(opt);
+    bs.run();
+    EXPECT_GE(bs.fake_sock_.sent_cnt_, 5); // Discovery + Request
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 1);
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RA), 1);
+    EXPECT_GE(bs.tc_.getAllUniqueAddrReply().size(), 1);
+    EXPECT_GE(bs.tc_.getAllUniqueAddrAdvert().size(), 1);
+    EXPECT_EQ(bs.tc_.getStatsMgr().getNonUniqueAddrNum(ExchangeType::DO), 9);
+    EXPECT_EQ(bs.tc_.getStatsMgr().getNonUniqueAddrNum(ExchangeType::RA), 9);
+}
+
+TEST_F(BasicScenTest, Address6Unique) {
+    // send more than 1 solicit+request but with the same address
+    // counter of a unique addresses should be 1
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -6 -u -l fake -r 10 -n 10 -g single ::1");
+    NakedBasicScen bs(opt);
+    bs.run();
+    EXPECT_GE(bs.fake_sock_.sent_cnt_, 5); // Solicit + Request
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 1);
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RR), 1);
+    EXPECT_GE(bs.tc_.getAllUniqueAddrReply().size(), 1);
+    EXPECT_GE(bs.tc_.getAllUniqueAddrAdvert().size(), 1);
+    EXPECT_EQ(bs.tc_.getStatsMgr().getNonUniqueAddrNum(ExchangeType::SA), 9);
+    EXPECT_EQ(bs.tc_.getStatsMgr().getNonUniqueAddrNum(ExchangeType::RR), 9);
+}
+
+TEST_F(BasicScenTest, Packet4ExchangeMaxDrop10Proc) {
+    CommandOptions opt;
+
+    // With the following command line we restrict the maximum
+    // number of dropped packets to 10% of all.
+    // Use templates for this test.
+    processCmdLine(opt, "perfdhcp -l fake -r 100 -R 20 -n 100"
+                   " -D 10% -L 10547  -g single"
+                   // \todo seems to be broken as it crashes building pkt
+                   // " -T " + getFullPath("discover-example.hex")
+                   // + " -T " + getFullPath("request4-example.hex")
+                   " 127.0.0.1");
+    // The number iterations is restricted by the percentage of
+    // dropped packets (-D 10%).
+    NakedBasicScen bs(opt);
+    bs.fake_sock_.start_dropping_after_cnt_ = 10;
+    bs.run();
+    EXPECT_GE(bs.fake_sock_.sent_cnt_, 15); // Discovery + Request
+    EXPECT_LE(bs.fake_sock_.sent_cnt_, 20); // Discovery + Request
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::DO), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::DO), 15);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::DO), 15);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RA), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RA), 15);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RA), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RA), 15);
+}
+
+
+TEST_F(BasicScenTest, Packet6Exchange) {
+    // Set number of iterations to 10.
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -6 -r 100 -n 10 -g single -R 20 -L 10547 ::1");
+    // Set number of received packets equal to number of iterations.
+    // This simulates no packet drops.
+    NakedBasicScen bs(opt);
+    bs.run();
+    EXPECT_GE(bs.fake_sock_.sent_cnt_, 20); // Solicit + Request
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::SA), 10);
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 10);
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RR), 10);
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RR), 10);
+}
+
+TEST_F(BasicScenTest, Packet6ExchangeMaxDrop3Pkt) {
+    CommandOptions opt;
+    // The maximum number of dropped packets is 3 (because of -D 3).
+    processCmdLine(opt, "perfdhcp -l fake"
+                   " -6 -r 100 -n 100 -R 20 -D 3 -L 10547"
+                   // \todo seems to be broken as it crashes building pkt
+                   // " -T " + getFullPath("solicit-example.hex")
+                   // + " -T " + getFullPath("request6-example.hex")
+                   " ::1");
+
+    // Simulate the number of Solicit-Advertise-Request-Reply (SARR) exchanges.
+    // The test function generates server's responses and passes it to the
+    // TestControl class methods for processing. The number of exchanges
+    // actually performed is controller by 'start_dropping_after_cnt_'.
+    // All exchanged packets carry the IA_NA option
+    // to simulate the IPv6 address acquisition and to verify that the
+    // IA_NA options returned by the server are processed correctly.
+    NakedBasicScen bs(opt);
+    bs.fake_sock_.start_dropping_after_cnt_ = 10;
+    bs.run();
+    EXPECT_GE(bs.fake_sock_.sent_cnt_, 10);
+    EXPECT_LE(bs.fake_sock_.sent_cnt_, 20);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::SA), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::SA), 15);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::SA), 15);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RR), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getSentPacketsNum(ExchangeType::RR), 15);
+
+    EXPECT_GE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RR), 1);
+    EXPECT_LE(bs.tc_.getStatsMgr().getRcvdPacketsNum(ExchangeType::RR), 15);
+}
diff --git a/src/bin/perfdhcp/tests/command_options_helper.h b/src/bin/perfdhcp/tests/command_options_helper.h
new file mode 100644
index 0000000..dd8e512
--- /dev/null
+++ b/src/bin/perfdhcp/tests/command_options_helper.h
@@ -0,0 +1,134 @@
+// Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef COMMAND_OPTIONS_HELPER_H
+#define COMMAND_OPTIONS_HELPER_H
+
+#include "../command_options.h"
+#include <exceptions/exceptions.h>
+
+#include <assert.h>
+#include <iterator>
+#include <cstring>
+#include <string>
+#include <vector>
+
+
+namespace isc {
+namespace perfdhcp {
+
+/// \brief Command Options Helper class.
+///
+/// This helper class can be shared between unit tests that
+/// need to initialize CommandOptions objects and feed it with
+/// specific command line. The command line can be given as a
+/// string representing program name, options and arguments.
+/// The static method exposed by this class can be used to
+/// tokenize this string into array of C-strings that are later
+/// consumed by \ref CommandOptions::parse. The state of the
+/// CommandOptions object is reset every time the process
+/// function is invoked. Also, when command line parsing is
+/// ended the array of C-string is freed from the memory.
+class CommandOptionsHelper {
+public:
+
+    /// \brief Wrapper class for allocated argv[] array.
+    ///
+    /// This class wraps allocated char** array and ensures that memory
+    /// allocated for this array is freed at the end o the scope.
+    class ArgvPtr {
+    public:
+        /// \brief Constructor.
+        ///
+        /// \param argv array of C-strings.
+        /// \param number of C-strings in the array.
+        ArgvPtr(char** argv, int argc) : argv_(argv), argc_(argc) { }
+
+        /// \brief Destructor.
+        ///
+        /// Deallocates wrapped array of C-strings.
+        ~ArgvPtr() {
+            if (argv_ != NULL) {
+                for(int i = 0; i < argc_; ++i) {
+                    delete[] (argv_[i]);
+                    argv_[i] = NULL;
+                }
+                delete[] (argv_);
+            }
+        }
+
+        /// \brief Return the array of C-strings.
+        ///
+        /// \return array of C-strings.
+        char** getArgv() const { return (argv_); }
+
+        /// \brief Return C-strings counter.
+        ///
+        /// \return C-strings counter.
+        int getArgc() const { return(argc_); }
+
+    public:
+        char** argv_; ///< array of C-strings being wrapped.
+        int argc_;    ///< number of C-strings.
+    };
+
+    /// \brief Parse command line provided as string.
+    ///
+    /// Method transforms the string representing command line
+    /// to the array of C-strings consumed by the
+    /// \ref CommandOptions::parse function and performs
+    /// parsing.
+    ///
+    /// \param cmdline command line provided as single string.
+    /// \return true if program has been run in help or version mode ('h' or 'v' flag).
+    static bool process(CommandOptions& opt, const std::string& cmdline) {
+        int argc = 0;
+        char** argv = tokenizeString(cmdline, argc);
+        ArgvPtr args(argv, argc);
+        opt.reset();
+        return (opt.parse(args.getArgc(), args.getArgv()));
+    }
+
+private:
+
+    /// \brief Split string to the array of C-strings.
+    ///
+    /// \param text_to_split string to be split.
+    /// \param [out] num number of substrings returned.
+    /// \param std::bad_alloc if allocation of C-strings failed.
+    /// \return array of C-strings created from split.
+    static char** tokenizeString(const std::string& text_to_split, int& num) {
+        char** results = NULL;
+        // Tokenization with std streams
+        std::stringstream text_stream(text_to_split);
+        // Iterators to be used for tokenization
+        std::istream_iterator<std::string> text_iterator(text_stream);
+        std::istream_iterator<std::string> text_end;
+        // Tokenize string (space is a separator) using begin and end iterators
+        std::vector<std::string> tokens(text_iterator, text_end);
+
+        if (!tokens.empty()) {
+            // Allocate array of C-strings where we will store tokens
+            results = new char*[tokens.size()];
+            // Store tokens in C-strings array
+            for (size_t i = 0; i < tokens.size(); ++i) {
+                size_t cs_size = tokens[i].length() + 1;
+                char* cs = new char[cs_size];
+                strncpy(cs, tokens[i].c_str(), cs_size);
+                assert(cs[cs_size - 1] == '\0');
+                results[i] = cs;
+            }
+            // Return number of tokens to calling function
+            num = tokens.size();
+        }
+        return results;
+    }
+};
+
+} // namespace isc::perfdhcp
+} // namespace isc
+
+#endif // COMMAND_OPTIONS_HELPER_H
diff --git a/src/bin/perfdhcp/tests/command_options_unittest.cc b/src/bin/perfdhcp/tests/command_options_unittest.cc
new file mode 100644
index 0000000..08720d5
--- /dev/null
+++ b/src/bin/perfdhcp/tests/command_options_unittest.cc
@@ -0,0 +1,1017 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cstddef>
+#include <fstream>
+#include <gtest/gtest.h>
+#include <stdint.h>
+#include <string>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+#include <dhcp/iface_mgr.h>
+#include <exceptions/exceptions.h>
+
+#include "command_options_helper.h"
+
+using namespace std;
+using namespace isc;
+using namespace isc::perfdhcp;
+using namespace boost::posix_time;
+
+// Verify that default constructor sets lease type to the expected value.
+TEST(LeaseTypeTest, defaultConstructor) {
+    CommandOptions::LeaseType lease_type;
+    EXPECT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS));
+}
+
+// Verify that the constructor sets the lease type to the specified value.
+TEST(LeaseTypeTest, constructor) {
+    CommandOptions::LeaseType
+        lease_type1(CommandOptions::LeaseType::ADDRESS);
+    EXPECT_TRUE(lease_type1.is(CommandOptions::LeaseType::ADDRESS));
+
+    CommandOptions::LeaseType
+        lease_type2(CommandOptions::LeaseType::PREFIX);
+    EXPECT_TRUE(lease_type2.is(CommandOptions::LeaseType::PREFIX));
+}
+
+// Verify that the lease type can be modified using set() function.
+TEST(LeaseTypeTest, set) {
+    CommandOptions::LeaseType
+        lease_type(CommandOptions::LeaseType::ADDRESS);
+    EXPECT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS));
+
+    lease_type.set(CommandOptions::LeaseType::PREFIX);
+    EXPECT_TRUE(lease_type.is(CommandOptions::LeaseType::PREFIX));
+}
+
+// Verify that the includes() function returns true when the lease type
+// specified with the function argument is the same as the lease type
+// encapsulated by the LeaseType object on which include function is called
+// or when the lease type value encapsulated by this object is
+// ADDRESS_AND_PREFIX.
+TEST(LeaseTypeTest, includes) {
+    // Lease type: ADDRESS
+    CommandOptions::LeaseType lease_type(CommandOptions::LeaseType::ADDRESS);
+    // Lease type IS ADDRESS.
+    ASSERT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS));
+    // Lease type includes the ADDRESS.
+    EXPECT_TRUE(lease_type.includes(CommandOptions::LeaseType::ADDRESS));
+    // Lease type does not include PREFIX.
+    EXPECT_FALSE(lease_type.includes(CommandOptions::LeaseType::PREFIX));
+    // Lease type does not include ADDRESS_AND_PREFIX.
+    EXPECT_FALSE(
+        lease_type.includes(CommandOptions::LeaseType::ADDRESS_AND_PREFIX)
+    );
+
+    // Do the same check for PREFIX.
+    lease_type.set(CommandOptions::LeaseType::PREFIX);
+    EXPECT_FALSE(lease_type.includes(CommandOptions::LeaseType::ADDRESS));
+    EXPECT_TRUE(lease_type.includes(CommandOptions::LeaseType::PREFIX));
+    EXPECT_FALSE(
+        lease_type.includes(CommandOptions::LeaseType::ADDRESS_AND_PREFIX)
+    );
+
+    // When lease type is set to 'address-and-prefix' it means that client
+    // requests both address and prefix (IA_NA and IA_PD). Therefore, the
+    // LeaseType::includes() function should return true for both ADDRESS
+    // and PREFIX.
+    lease_type.set(CommandOptions::LeaseType::ADDRESS_AND_PREFIX);
+    EXPECT_TRUE(lease_type.includes(CommandOptions::LeaseType::ADDRESS));
+    EXPECT_TRUE(lease_type.includes(CommandOptions::LeaseType::PREFIX));
+    EXPECT_TRUE(
+        lease_type.includes(CommandOptions::LeaseType::ADDRESS_AND_PREFIX)
+    );
+
+}
+
+// Verify that the LeaseType::fromCommandLine() function parses the lease-type
+// argument specified as -e<lease-type>.
+TEST(LeaseTypeTest, fromCommandLine) {
+    CommandOptions::LeaseType
+        lease_type(CommandOptions::LeaseType::ADDRESS);
+    ASSERT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS));
+
+    lease_type.fromCommandLine("prefix-only");
+    ASSERT_TRUE(lease_type.is(CommandOptions::LeaseType::PREFIX));
+
+    lease_type.fromCommandLine("address-only");
+    EXPECT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS));
+
+    lease_type.fromCommandLine("address-and-prefix");
+    EXPECT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS_AND_PREFIX));
+
+    EXPECT_THROW(lease_type.fromCommandLine("bogus-parameter"),
+                 isc::InvalidParameter);
+
+}
+
+// Verify that the LeaseType::toText() function returns the textual
+// representation of the lease type specified.
+TEST(LeaseTypeTest, toText) {
+    CommandOptions::LeaseType lease_type;
+    ASSERT_TRUE(lease_type.is(CommandOptions::LeaseType::ADDRESS));
+    EXPECT_EQ("address-only (IA_NA option added to the client's request)",
+              lease_type.toText());
+
+    lease_type.set(CommandOptions::LeaseType::PREFIX);
+    EXPECT_EQ("prefix-only (IA_PD option added to the client's request)",
+              lease_type.toText());
+
+    lease_type.set(CommandOptions::LeaseType::ADDRESS_AND_PREFIX);
+    EXPECT_EQ("address-and-prefix (Both IA_NA and IA_PD options added to the"
+              " client's request)", lease_type.toText());
+
+}
+
+/// \brief Test Fixture Class
+///
+/// This test fixture class is used to perform
+/// unit tests on perfdhcp CommandOptions class.
+class CommandOptionsTest : public virtual ::testing::Test
+{
+public:
+    /// \brief Default Constructor
+    CommandOptionsTest() { }
+
+protected:
+    /// \brief Parse command line and cleanup
+    ///
+    /// The method tokenizes command line to array of C-strings,
+    /// parses arguments using CommandOptions class to set
+    /// its data members and de-allocates array of C-strings.
+    ///
+    /// \param cmdline Command line to parse.
+    /// \throws std::bad allocation if tokenization failed.
+    /// \return true if program has been run in help or version mode ('h' or 'v' flag).
+    bool process(CommandOptions& opt, const std::string& cmdline) {
+        return (CommandOptionsHelper::process(opt, cmdline));
+    }
+
+    /// \brief Get full path to a file in testdata directory.
+    ///
+    /// \param filename filename being appended to absolute
+    /// path to testdata directory
+    ///
+    /// \return full path to a file in testdata directory.
+    std::string getFullPath(const std::string& filename) const {
+        std::ostringstream stream;
+        stream << TEST_DATA_DIR << "/" << filename;
+        return (stream.str());
+    }
+};
+
+TEST_F(CommandOptionsTest, Defaults) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp 192.168.0.1"));
+    EXPECT_EQ(4, opt.getIpVersion());
+    EXPECT_EQ(CommandOptions::DORA_SARR, opt.getExchangeMode());
+    EXPECT_TRUE(opt.getLeaseType().is(CommandOptions::LeaseType::ADDRESS));
+    EXPECT_EQ(0, opt.getRate());
+    EXPECT_EQ(0, opt.getRenewRate());
+    EXPECT_EQ(0, opt.getReleaseRate());
+    EXPECT_EQ(0, opt.getReportDelay());
+    EXPECT_EQ(0, opt.getClientsNum());
+
+    // default mac
+    const uint8_t mac[6] = { 0x00, 0x0C, 0x01, 0x02, 0x03, 0x04 };
+    std::vector<uint8_t> v1 = opt.getMacTemplate();
+    ASSERT_EQ(6, v1.size());
+    EXPECT_TRUE(std::equal(v1.begin(), v1.end(), mac));
+
+    // Check if DUID is initialized. The DUID-LLT is expected
+    // to start with DUID_LLT value of 1 and hardware ethernet
+    // type equal to 1 (HWETHER_TYPE).
+    const uint8_t duid_llt_and_hw[4] = { 0x0, 0x1, 0x0, 0x1 };
+    // We assume DUID-LLT length 14. This includes 4 octets of
+    // DUID_LLT value, two octets of hardware type, 4 octets
+    // of time value and 6 octets of variable link layer (MAC)
+    // address.
+    const int duid_llt_size = 14;
+    // DUID is not given from the command line but it is supposed
+    // to be initialized by the CommandOptions private method
+    // generateDuidTemplate().
+    std::vector<uint8_t> v2 = opt.getDuidTemplate();
+    ASSERT_EQ(duid_llt_size, opt.getDuidTemplate().size());
+    EXPECT_TRUE(std::equal(v2.begin(), v2.begin() + 4,
+                           duid_llt_and_hw));
+    // Check time field contents.
+    ptime now = microsec_clock::universal_time();
+    ptime duid_epoch(from_iso_string("20000101T000000"));
+    time_period period(duid_epoch, now);
+    uint32_t duration_sec = period.length().total_seconds();
+    // Read time from the template generated.
+    uint32_t duration_from_template = 0;
+    memcpy(&duration_from_template, &v2[4], 4);
+    duration_from_template = htonl(duration_from_template);
+    // In special cases, we may have overflow in time field
+    // so we give ourselves the margin of 10 seconds here.
+    // If time value has been set more then 10 seconds back
+    // it is safe to compare it with the time value generated
+    // from now.
+    if (duration_from_template > 10) {
+        EXPECT_GE(duration_sec, duration_from_template);
+    }
+
+    EXPECT_EQ(0, opt.getBase().size());
+    EXPECT_EQ(0, opt.getNumRequests().size());
+    EXPECT_EQ(0, opt.getPeriod());
+    for (size_t i = 0; i < opt.getDropTime().size(); ++i) {
+        EXPECT_DOUBLE_EQ(1, opt.getDropTime()[i]);
+    }
+    ASSERT_EQ(opt.getMaxDrop().size(), opt.getMaxDropPercentage().size());
+    for (size_t i = 0; i < opt.getMaxDrop().size(); ++i) {
+        EXPECT_EQ(0, opt.getMaxDrop()[i]);
+        EXPECT_EQ(0, opt.getMaxDropPercentage()[i]);
+    }
+    EXPECT_EQ("", opt.getLocalName());
+    EXPECT_FALSE(opt.isInterface());
+    EXPECT_EQ(0, opt.getPreload());
+    EXPECT_EQ(0, opt.getLocalPort());
+    EXPECT_FALSE(opt.isSeeded());
+    EXPECT_EQ(0, opt.getSeed());
+    EXPECT_FALSE(opt.isBroadcast());
+    EXPECT_FALSE(opt.isRapidCommit());
+    EXPECT_FALSE(opt.isUseFirst());
+    EXPECT_FALSE(opt.getAddrUnique());
+    EXPECT_EQ(-1, opt.getIncreaseElapsedTime());
+    EXPECT_EQ(-1, opt.getWaitForElapsedTime());
+    EXPECT_EQ(0, opt.getTemplateFiles().size());
+    EXPECT_EQ(0, opt.getTransactionIdOffset().size());
+    EXPECT_EQ(0, opt.getRandomOffset().size());
+    EXPECT_GT(0, opt.getElapsedTimeOffset());
+    EXPECT_GT(0, opt.getServerIdOffset());
+    EXPECT_GT(0, opt.getRequestedIpOffset());
+    EXPECT_EQ("", opt.getDiags());
+    EXPECT_EQ("", opt.getWrapped());
+    EXPECT_EQ("192.168.0.1", opt.getServerName());
+}
+
+TEST_F(CommandOptionsTest, HelpVersion) {
+    // The parser is supposed to return true if 'h' or 'v' options
+    // are specified.
+    CommandOptions opt;
+    EXPECT_TRUE(process(opt, "perfdhcp -h"));
+    EXPECT_TRUE(process(opt, "perfdhcp -v"));
+    EXPECT_TRUE(process(opt, "perfdhcp -h -v"));
+    EXPECT_TRUE(process(opt, "perfdhcp -6 -l ethx -h all"));
+    EXPECT_TRUE(process(opt, "perfdhcp -l ethx -v all"));
+    // No 'h' or 'v' option specified. The false value
+    // should be returned.
+    EXPECT_FALSE(process(opt, "perfdhcp -l ethx all"));
+}
+
+TEST_F(CommandOptionsTest, CheckAddressUniqueness) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -u -l ethx all"));
+    EXPECT_TRUE(opt.getAddrUnique());
+}
+
+TEST_F(CommandOptionsTest, UseFirst) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -1 -B -l ethx all"));
+    EXPECT_TRUE(opt.isUseFirst());
+}
+
+TEST_F(CommandOptionsTest, UseCleanOutput) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -C, -l ethx all"));
+    EXPECT_TRUE(opt.getCleanReport());
+    EXPECT_EQ(",", opt.getCleanReportSeparator());
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -A1 -l ethx all"));
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    // -4 and -A must not coexist
+    EXPECT_THROW(process(opt, "perfdhcp -4 -A1 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, IpVersion) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -l ethx -c -i all"));
+    EXPECT_EQ(6, opt.getIpVersion());
+    EXPECT_EQ("ethx", opt.getLocalName());
+    EXPECT_TRUE(opt.isRapidCommit());
+    EXPECT_FALSE(opt.isBroadcast());
+    process(opt, "perfdhcp -4 -B -l ethx all");
+    EXPECT_EQ(4, opt.getIpVersion());
+    EXPECT_TRUE(opt.isBroadcast());
+    EXPECT_FALSE(opt.isRapidCommit());
+
+    // Negative test cases
+    // -4 and -6 must not coexist
+    EXPECT_THROW(process(opt, "perfdhcp -4 -6 -l ethx all"), isc::InvalidParameter);
+    // -6 and -B must not coexist
+    EXPECT_THROW(process(opt, "perfdhcp -6 -B -l ethx all"), isc::InvalidParameter);
+    // -c and -4 (default) must not coexist
+    EXPECT_THROW(process(opt, "perfdhcp -c -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, LeaseType) {
+    CommandOptions opt;
+    // Check that the -e address-only works for IPv6.
+    ASSERT_NO_THROW(process(opt, "perfdhcp -6 -l etx -e address-only all"));
+    EXPECT_EQ(6, opt.getIpVersion());
+    EXPECT_EQ("etx", opt.getLocalName());
+    EXPECT_TRUE(opt.getLeaseType().is(CommandOptions::LeaseType::ADDRESS));
+    // Check that the -e address-only works for IPv4.
+    ASSERT_NO_THROW(process(opt, "perfdhcp -4 -l etx -e address-only all"));
+    EXPECT_EQ(4, opt.getIpVersion());
+    EXPECT_EQ("etx", opt.getLocalName());
+    EXPECT_TRUE(opt.getLeaseType().is(CommandOptions::LeaseType::ADDRESS));
+    // Check that the -e prefix-only works.
+    ASSERT_NO_THROW(process(opt, "perfdhcp -6 -l etx -e prefix-only all"));
+    EXPECT_EQ(6, opt.getIpVersion());
+    EXPECT_EQ("etx", opt.getLocalName());
+    EXPECT_TRUE(opt.getLeaseType().is(CommandOptions::LeaseType::PREFIX));
+    // Check that -e prefix-only must not coexist with -4 option.
+    EXPECT_THROW(process(opt, "perfdhcp -4 -l ethx -e prefix-only all"),
+                 InvalidParameter);
+    // Check that -e prefix-only must not coexist with -T options.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -l ethx -e prefix-only -T file1.hex"
+                         " -T file2.hex -E 4 all"), InvalidParameter);
+
+}
+
+TEST_F(CommandOptionsTest, Rate) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -4 -r 10 -l ethx all"));
+    EXPECT_EQ(10, opt.getRate());
+
+    // Negative test cases
+    // Rate must not be 0
+    EXPECT_THROW(process(opt, "perfdhcp -4 -r 0 -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, RenewRate) {
+    CommandOptions opt;
+    // If -f is specified together with -r the command line should
+    // be accepted and the renew rate should be set.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -r 10 -f 10 -l ethx all"));
+    EXPECT_EQ(10, opt.getRenewRate());
+    // Check that the release rate can be set to different value than
+    // rate specified as -r<rate>. Also, swap -f and -r to make sure
+    // that order doesn't matter.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -f 5 -r 10 -l ethx all"));
+    EXPECT_EQ(5, opt.getRenewRate());
+    // Renew rate should also be accepted for DHCPv4 case.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -4 -f 5 -r 10 -l ethx all"));
+    EXPECT_EQ(5, opt.getRenewRate());
+    // The renew rate should not be greater than the rate.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -f 11 -l ethx all"),
+                 isc::InvalidParameter);
+    // The renew-rate of 0 is invalid.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -f 0 -l ethx all"),
+                 isc::InvalidParameter);
+    // The negative renew-rate is invalid.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -f -5 -l ethx all"),
+                 isc::InvalidParameter);
+    // If -r<rate> is not specified the -f<renew-rate> should not
+    // be accepted.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -f 10 -l ethx all"),
+                 isc::InvalidParameter);
+    // Renew rate should be specified.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -f -l ethx all"),
+                 isc::InvalidParameter);
+
+    // -f and -i are mutually exclusive
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -f 10 -l ethx -i all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, ReleaseRate) {
+    CommandOptions opt;
+    // If -F is specified together with -r the command line should
+    // be accepted and the release rate should be set.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -r 10 -F 10 -l ethx all"));
+    EXPECT_EQ(10, opt.getReleaseRate());
+    // Check that the release rate can be set to different value than
+    // rate specified as -r<rate>. Also, swap -F and -r to make sure
+    // that order doesn't matter.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -F 5 -r 10 -l ethx all"));
+    EXPECT_EQ(5, opt.getReleaseRate());
+    // The release rate should not be greater than the rate.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -F 11 -l ethx all"),
+                 isc::InvalidParameter);
+    // The release-rate of 0 is invalid.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -F 0 -l ethx all"),
+                 isc::InvalidParameter);
+    // The negative release-rate is invalid.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -F -5 -l ethx all"),
+                 isc::InvalidParameter);
+    // If -r<rate> is not specified the -F<release-rate> should not
+    // be accepted.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -F 10 -l ethx all"),
+                 isc::InvalidParameter);
+    // -F<release-rate> should be usable in IPv6 mode.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -4 -r 10 -F 10 -l ethx all"));
+    // Release rate should be specified.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -F -l ethx all"),
+                 isc::InvalidParameter);
+    // -F and -i are mutually exclusive
+    EXPECT_THROW(process(opt, "perfdhcp -6 -r 10 -F 10 -l ethx -i all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, ReleaseRenew) {
+    CommandOptions opt;
+    // It should be possible to specify the -F, -f and -r options.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -r 10 -F 3 -f 5 -l ethx all"));
+    EXPECT_EQ(10, opt.getRate());
+    EXPECT_EQ(3, opt.getReleaseRate());
+    EXPECT_EQ(5, opt.getRenewRate());
+    // It should be possible to specify the -F and -f with the values which
+    // sum is equal to the rate specified as -r<rate>.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -r 8 -F 3 -f 5 -l ethx all"));
+    EXPECT_EQ(8, opt.getRate());
+    EXPECT_EQ(3, opt.getReleaseRate());
+    EXPECT_EQ(5, opt.getRenewRate());
+    // Check that the sum of the release and renew rate is not greater
+    // than the rate specified as -r<rate>.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -F 6 -f 5 -r 10 -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, ReportDelay) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -t 17 -l ethx all"));
+    EXPECT_EQ(17, opt.getReportDelay());
+
+    // Negative test cases
+    // -t must be positive integer
+    EXPECT_THROW(process(opt, "perfdhcp -t -8 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -t 0 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -t s -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, ClientsNum) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -R 200 -l ethx all"));
+    EXPECT_EQ(200, opt.getClientsNum());
+    process(opt, "perfdhcp -R 0 -l ethx all");
+    EXPECT_EQ(0, opt.getClientsNum());
+
+    // Negative test cases
+    // Number of clients must be non-negative integer
+    EXPECT_THROW(process(opt, "perfdhcp -R -5 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -R gs -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Base) {
+    CommandOptions opt;
+    uint8_t mac[6] = {0x10, 0x20, 0x30, 0x40, 0x50, 0x60 };
+    uint8_t duid[14] = {  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+                          0x01, 0x01, 0x01, 0x10, 0x11, 0x1F, 0x14 };
+    // Test DUID and MAC together.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -b DUID=0101010101010101010110111F14"
+                            " -b MAC=10::20::30::40::50::60"
+                            " -l 127.0.0.1 all"));
+    std::vector<uint8_t> v1 = opt.getMacTemplate();
+    std::vector<uint8_t> v2 = opt.getDuidTemplate();
+    EXPECT_TRUE(std::equal(v1.begin(), v1.end(), mac));
+    EXPECT_TRUE(std::equal(v2.begin(), v2.end(), duid));
+    // Test valid DUID.
+    EXPECT_NO_THROW(
+        process(opt, "perfdhcp -b duid=0101010101010101010110111F14 -l 127.0.0.1 all")
+    );
+
+    ASSERT_EQ(sizeof(duid) / sizeof(uint8_t), v2.size());
+    EXPECT_TRUE(std::equal(v2.begin(), v2.end(), duid));
+    // Test mix of upper/lower case letters.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -b DuiD=0101010101010101010110111F14"
+                            " -b Mac=10::20::30::40::50::60"
+                            " -l 127.0.0.1 all"));
+    v1 = opt.getMacTemplate();
+    v2 = opt.getDuidTemplate();
+    EXPECT_TRUE(std::equal(v1.begin(), v1.end(), mac));
+    EXPECT_TRUE(std::equal(v2.begin(), v2.end(), duid));
+    // Use "ether" instead of "mac".
+    EXPECT_NO_THROW(process(opt, "perfdhcp -b ether=10::20::30::40::50::60"
+                            " -l 127.0.0.1 all"));
+    v1 = opt.getMacTemplate();
+    EXPECT_TRUE(std::equal(v1.begin(), v1.end(), mac));
+    // Use "ETHER" in upper case.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -b ETHER=10::20::30::40::50::60"
+                            " -l 127.0.0.1 all"));
+    v1 = opt.getMacTemplate();
+    EXPECT_TRUE(std::equal(v1.begin(), v1.end(), mac));
+    // "t" is invalid character in DUID
+    EXPECT_THROW(process(opt, "perfdhcp -6 -l ethx -b "
+                         "duid=010101010101010101t110111F14 all"),
+                 isc::InvalidParameter);
+    // "3x" is invalid value in MAC address
+    EXPECT_THROW(process(opt, "perfdhcp -b mac=10::2::3x::4::5::6 -l ethx all"),
+                 isc::InvalidParameter);
+    // Base is not specified
+    EXPECT_THROW(process(opt, "perfdhcp -b -l ethx all"),
+                 isc::InvalidParameter);
+    // Typo: should be mac= instead of mc=
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -b mc=00:01:02:03::04:05 all"),
+                 isc::InvalidParameter);
+    // Too short DUID (< 6).
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -b duid=00010203 all"),
+                 isc::InvalidParameter);
+    // Odd number of digits.
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -b duid=000102030405060 all"),
+                 isc::InvalidParameter);
+    // Too short MAC (!= 6).
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -b mac=00:01:02:04 all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, DropTime) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -l ethx -d 12 all"));
+    ASSERT_EQ(2, opt.getDropTime().size());
+    EXPECT_DOUBLE_EQ(12, opt.getDropTime()[0]);
+    EXPECT_DOUBLE_EQ(1, opt.getDropTime()[1]);
+
+    EXPECT_NO_THROW(process(opt, "perfdhcp -l ethx -d 2 -d 4.7 all"));
+    ASSERT_EQ(2, opt.getDropTime().size());
+    EXPECT_DOUBLE_EQ(2, opt.getDropTime()[0]);
+    EXPECT_DOUBLE_EQ(4.7, opt.getDropTime()[1]);
+
+    // Negative test cases
+    // Drop time must not be negative
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -d -2 -d 4.7 all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -d -9.1 -d 0 all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, TimeOffset) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -l ethx -T file1.x -T file2.x -E 4 all"));
+    EXPECT_EQ(4, opt.getElapsedTimeOffset());
+
+    // Negative test cases
+    // Argument -E must be used with -T
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -E 3 -i all"),
+                 isc::InvalidParameter);
+    // Value in -E not specified
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -T file.x -E -i all"),
+                 isc::InvalidParameter);
+    // Value for -E must not be negative
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -E -3 -T file.x all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, ExchangeMode) {
+    CommandOptions opt;
+    process(opt, "perfdhcp -l ethx -i all");
+    EXPECT_EQ(CommandOptions::DO_SA, opt.getExchangeMode());
+
+    // Negative test cases
+    // No template file specified
+    EXPECT_THROW(process(opt, "perfdhcp -i -l ethx -X 3 all"),
+                 isc::InvalidParameter);
+    // Offsets can't be used in simple exchanges (-i)
+    EXPECT_THROW(process(opt, "perfdhcp -i -l ethx -O 2 -T file.x all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -i -l ethx -E 3 -T file.x all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -i -l ethx -S 1 -T file.x all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -i -l ethx -I 2 -T file.x all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Offsets) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -E5 -4 -I 2 -S3 -O 30 -X7 -l ethx "
+                            "-X3 -T file1.x -T file2.x all"));
+    EXPECT_EQ(2, opt.getRequestedIpOffset());
+    EXPECT_EQ(5, opt.getElapsedTimeOffset());
+    EXPECT_EQ(3, opt.getServerIdOffset());
+    ASSERT_EQ(2, opt.getRandomOffset().size());
+    EXPECT_EQ(30, opt.getRandomOffset()[0]);
+    EXPECT_EQ(30, opt.getRandomOffset()[1]);
+    ASSERT_EQ(2, opt.getTransactionIdOffset().size());
+    EXPECT_EQ(7, opt.getTransactionIdOffset()[0]);
+    EXPECT_EQ(3, opt.getTransactionIdOffset()[1]);
+
+    // Negative test cases
+    // IP offset/IA_NA offset must be positive
+    EXPECT_THROW(process(opt, "perfdhcp -6 -I 0 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -6 -I -4 -l ethx all"),
+                 isc::InvalidParameter);
+
+    // \todo other negative cases
+}
+
+TEST_F(CommandOptionsTest, LocalPort) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -l ethx -L 2000 all"));
+    EXPECT_EQ(2000, opt.getLocalPort());
+
+    // Negative test cases
+    // Local port must be between 0..65535
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -L -2 all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -L all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -L 65540 all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Preload) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -1 -P 3 -l ethx all"));
+    EXPECT_EQ(3, opt.getPreload());
+
+    // Negative test cases
+    // Number of preload packages must not be negative integer
+    EXPECT_THROW(process(opt, "perfdhcp -P -1 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -P -3 -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Seed) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -P 2 -s 23 -l ethx all"));
+    EXPECT_EQ(23, opt.getSeed());
+    EXPECT_TRUE(opt.isSeeded());
+
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -P 2 -s 0 -l ethx all"));
+    EXPECT_EQ(0, opt.getSeed());
+    EXPECT_FALSE(opt.isSeeded());
+
+    // Negative test cases
+    // Seed must be non-negative integer
+    EXPECT_THROW(process(opt, "perfdhcp -6 -P 2 -s -5 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -6 -P 2 -s -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, TemplateFiles) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -T file1.x -l ethx all"));
+    ASSERT_EQ(1, opt.getTemplateFiles().size());
+    EXPECT_EQ("file1.x", opt.getTemplateFiles()[0]);
+
+    EXPECT_NO_THROW(process(opt, "perfdhcp -T file1.x -s 12 -w start -T file2.x -4 -l ethx all"));
+    ASSERT_EQ(2, opt.getTemplateFiles().size());
+    EXPECT_EQ("file1.x", opt.getTemplateFiles()[0]);
+    EXPECT_EQ("file2.x", opt.getTemplateFiles()[1]);
+
+    // Negative test cases
+    // No template file specified
+    EXPECT_THROW(process(opt, "perfdhcp -s 12 -T -l ethx all"),
+                 isc::InvalidParameter);
+    // Too many template files specified
+    EXPECT_THROW(process(opt, "perfdhcp -s 12 -l ethx -T file.x "
+                         "-T file.x -T file.x all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Wrapped) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -B -w start -i -l ethx all"));
+    EXPECT_EQ("start", opt.getWrapped());
+
+    // Negative test cases
+    // Missing command after -w, expected start/stop
+    EXPECT_THROW(process(opt, "perfdhcp -B -i -l ethx -w all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Diagnostics) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -l ethx -i -x asTe all"));
+    EXPECT_EQ("asTe", opt.getDiags());
+
+    // Negative test cases
+    // No diagnostics string specified
+    EXPECT_THROW(process(opt, "perfdhcp -l ethx -i -x all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, MaxDrop) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -D 25 -l ethx all"));
+    EXPECT_EQ(25, opt.getMaxDrop()[0]);
+    EXPECT_NO_THROW(process(opt, "perfdhcp -D 25 -l ethx -D 15 all"));
+    EXPECT_EQ(25, opt.getMaxDrop()[0]);
+    EXPECT_EQ(15, opt.getMaxDrop()[1]);
+
+    EXPECT_NO_THROW(process(opt, "perfdhcp -D 15% -l ethx all"));
+    EXPECT_EQ(15, opt.getMaxDropPercentage()[0]);
+    EXPECT_NO_THROW(process(opt, "perfdhcp -D 15% -D25% -l ethx all"));
+    EXPECT_EQ(15, opt.getMaxDropPercentage()[0]);
+    EXPECT_EQ(25, opt.getMaxDropPercentage()[1]);
+    EXPECT_NO_THROW(process(opt, "perfdhcp -D 1% -D 99% -l ethx all"));
+    EXPECT_EQ(1, opt.getMaxDropPercentage()[0]);
+    EXPECT_EQ(99, opt.getMaxDropPercentage()[1]);
+
+    // Negative test cases
+    // Too many -D<value> options
+    EXPECT_THROW(process(opt, "perfdhcp -D 0% -D 1 -l ethx -D 3 all"),
+                 isc::InvalidParameter);
+    // Too many -D<value%> options
+    EXPECT_THROW(process(opt, "perfdhcp -D 99% -D 13% -l ethx -D 10% all"),
+                 isc::InvalidParameter);
+    // Percentage is out of bounds
+    EXPECT_THROW(process(opt, "perfdhcp -D101% -D 13% -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -D0% -D 13% -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, NumRequest) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -n 1000 -l ethx all"));
+    EXPECT_EQ(1000, opt.getNumRequests()[0]);
+    EXPECT_NO_THROW(process(opt, "perfdhcp -n 5 -n 500 -l ethx all"));
+    EXPECT_EQ(5, opt.getNumRequests()[0]);
+    EXPECT_EQ(500, opt.getNumRequests()[1]);
+
+    // Negative test cases
+    // Too many -n<value> parameters, expected maximum 2
+    EXPECT_THROW(process(opt, "perfdhcp -n 1 -n 2 -l ethx -n3 all"),
+                 isc::InvalidParameter);
+    // Num request must be positive integer
+    EXPECT_THROW(process(opt, "perfdhcp -n 1 -n -22 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -n 0 -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Period) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -p 120 -l ethx all"));
+    EXPECT_EQ(120, opt.getPeriod());
+
+    // Negative test cases
+    // Test period must be positive integer
+    EXPECT_THROW(process(opt, "perfdhcp -p 0 -l ethx all"),
+                 isc::InvalidParameter);
+    EXPECT_THROW(process(opt, "perfdhcp -p -3 -l ethx all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, Interface) {
+    // In order to make this test portable we need to know
+    // at least one interface name on OS where test is run.
+    // Interface Manager has ability to detect interfaces.
+    // Although we don't call initIsInterface explicitly
+    // here it is called by CommandOptions object internally
+    // so this function is covered by the test.
+    dhcp::IfaceMgr& iface_mgr = dhcp::IfaceMgr::instance();
+    const dhcp::IfaceCollection& ifaces = iface_mgr.getIfaces();
+    std::string iface_name;
+    CommandOptions opt;
+    // The local loopback interface should be available.
+    // If no interface have been found for any reason we should
+    // not fail this test.
+    if (!ifaces.empty()) {
+        // Get the name of the interface we detected.
+        iface_name = (*ifaces.begin())->getName();
+        // Use the name in the command parser.
+        ASSERT_NO_THROW(process(opt, "perfdhcp -4 -l " + iface_name + " abc"));
+        // We expect that command parser will detect that argument
+        // specified along with '-l' is the interface name.
+        EXPECT_TRUE(opt.isInterface());
+
+        // If neither interface nor server is specified then
+        // exception is expected to be thrown.
+        EXPECT_THROW(process(opt, "perfdhcp -4"), isc::InvalidParameter);
+    }
+}
+
+TEST_F(CommandOptionsTest, Server) {
+    CommandOptions opt;
+    // There is at least server parameter needed. If server is not
+    // specified the local interface must be specified.
+    // The server value equal to 'all' means use broadcast.
+    ASSERT_NO_THROW(process(opt, "perfdhcp all"));
+    // Once command line is parsed we expect that server name is
+    // set to broadcast address because 'all' was specified.
+    EXPECT_TRUE(opt.isBroadcast());
+    // The broadcast address is 255.255.255.255.
+    EXPECT_EQ(DHCP_IPV4_BROADCAST_ADDRESS, opt.getServerName());
+
+    // When all is specified for DHCPv6 mode we expect
+    // FF02::1:2 as a server name which means All DHCP
+    // servers and relay agents in local network segment
+    ASSERT_NO_THROW(process(opt, "perfdhcp -6 all"));
+    EXPECT_EQ(ALL_DHCP_RELAY_AGENTS_AND_SERVERS, opt.getServerName());
+
+    // When server='servers' in DHCPv6 mode we expect
+    // FF05::1:3 as server name which means All DHCP
+    // servers in local network.
+    ASSERT_NO_THROW(process(opt, "perfdhcp -6 servers"));
+    EXPECT_EQ(ALL_DHCP_SERVERS, opt.getServerName());
+
+    // If server name is neither 'all' nor 'servers'
+    // the given argument value is expected to be
+    // returned.
+    ASSERT_NO_THROW(process(opt, "perfdhcp -6 abc"));
+    EXPECT_EQ("abc", opt.getServerName());
+}
+
+TEST_F(CommandOptionsTest, LoadMacsFromFile) {
+    CommandOptions opt;
+
+    std::string mac_list_full_path = getFullPath("mac-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -M " << mac_list_full_path << " abc";
+    EXPECT_NO_THROW(process(opt, cmd.str()));
+    EXPECT_EQ(mac_list_full_path, opt.getMacListFile());
+
+    const CommandOptions::MacAddrsVector& m = opt.getMacsFromFile();
+    EXPECT_EQ(4, m.size());
+}
+
+TEST_F(CommandOptionsTest, LoadRelay4AddrFromFile) {
+    CommandOptions opt;
+    std::string relay_addr_list_full_path = getFullPath("relay4-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -4 -J " << relay_addr_list_full_path << " abc";
+    EXPECT_NO_THROW(process(opt, cmd.str()));
+    EXPECT_EQ(relay_addr_list_full_path, opt.getRelayAddrListFile());
+    EXPECT_TRUE(opt.checkMultiSubnet());
+    EXPECT_EQ(5, opt.getRelayAddrList().size());
+}
+
+TEST_F(CommandOptionsTest, LoadRelay6AddrFromFile) {
+    CommandOptions opt;
+    std::string relay_addr_list_full_path = getFullPath("relay6-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -6 -J " << relay_addr_list_full_path << " abc";
+    EXPECT_NO_THROW(process(opt, cmd.str()));
+    EXPECT_EQ(relay_addr_list_full_path, opt.getRelayAddrListFile());
+    EXPECT_TRUE(opt.checkMultiSubnet());
+    EXPECT_EQ(2, opt.getRelayAddrList().size());
+}
+
+TEST_F(CommandOptionsTest, RelayAddr6ForVersion4) {
+    CommandOptions opt;
+    std::string relay_addr_list_full_path = getFullPath("relay6-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -4 -J " << relay_addr_list_full_path << " abc";
+    EXPECT_THROW(process(opt, cmd.str()), isc::InvalidParameter);
+    EXPECT_FALSE(opt.checkMultiSubnet());
+    EXPECT_EQ(0, opt.getRelayAddrList().size());
+}
+
+TEST_F(CommandOptionsTest, RelayAddr4ForVersion6) {
+    CommandOptions opt;
+    std::string relay_addr_list_full_path = getFullPath("relay4-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -6 -J " << relay_addr_list_full_path << " abc";
+    EXPECT_THROW(process(opt, cmd.str()), isc::InvalidParameter);
+    EXPECT_FALSE(opt.checkMultiSubnet());
+    EXPECT_EQ(0, opt.getRelayAddrList().size());
+}
+
+
+TEST_F(CommandOptionsTest, LoadMacsFromFileNegativeCases) {
+    CommandOptions opt;
+    // Negative test cases
+    // Too many -M parameters, expected only 1
+    EXPECT_THROW(process(opt, "perfdhcp -M foo -M foo1 all"), isc::InvalidParameter);
+    // -M option can't use with -b option
+    EXPECT_THROW(process(opt, "perfdhcp -M foo -b mac=1234 all"),
+                 isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, ElapsedTime) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -y 3 -Y 10 192.168.0.1"));
+
+    EXPECT_EQ(3, opt.getIncreaseElapsedTime());
+    EXPECT_EQ(10, opt.getWaitForElapsedTime());
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithoutV6) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -A1 --or 32,00000E10 -l ethx all"));
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    EXPECT_EQ(1, opt.getRelayOpts().size());
+
+    // --or must be used together with -6
+    EXPECT_THROW(process(opt, "perfdhcp -A1 --or 32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithoutRelayEncapsulation) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -A1 --or 32,00000E10 -l ethx all"));
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    EXPECT_EQ(1, opt.getRelayOpts().size());
+
+    // --or must be used together with -A
+    EXPECT_THROW(process(opt, "perfdhcp -6 --or 32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseMultipleRelayV6Options) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -A1 --or 32,00000E10 --or "
+                                 "23,20010DB800010000000000000000CAFE -l ethx all"));
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    // 2 options expected at 1st level of encapsulation
+    EXPECT_EQ(2, opt.getRelayOpts().size());
+    // no options expected at 2nd level of encapsulation
+    EXPECT_THROW(opt.getRelayOpts(2), isc::OutOfRange);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithMultiSubnets) {
+    CommandOptions opt;
+    std::string relay_addr_list_full_path = getFullPath("relay6-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -6 -J " << relay_addr_list_full_path
+        << " -A1 --or 32,00000E10 --or 23,20010DB800010000000000000000CAFE -l ethx all";
+    EXPECT_NO_THROW(process(opt, cmd.str()));
+    EXPECT_EQ(relay_addr_list_full_path, opt.getRelayAddrListFile());
+    EXPECT_TRUE(opt.checkMultiSubnet());
+    EXPECT_EQ(2, opt.getRelayAddrList().size());
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    // 2 options expected at 1st level of encapsulation
+    EXPECT_EQ(2, opt.getRelayOpts().size());
+    // no options expected at 2nd level of encapsulation
+    EXPECT_THROW(opt.getRelayOpts(2), isc::OutOfRange);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsNoComma) {
+    CommandOptions opt;
+
+    // --or must be followed by encapsulation-level, colon, option code, a comma and hexstring
+    // in case encapsulation-level and colon are skipped, encapsulation-level is by default 1
+    EXPECT_THROW(process(opt, "perfdhcp -6 --or 3200000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsNegativeOptionCode) {
+    CommandOptions opt;
+
+    // --or must be followed by encapsulation-level, colon, positive option code, a comma and hexstring
+    // in case encapsulation-level and colon are skipped, encapsulation-level is by default 1
+    EXPECT_THROW(process(opt, "perfdhcp -6 --or -32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWrongHexstring) {
+    CommandOptions opt;
+
+    // --or hexstring containing char Z which is not correct
+    EXPECT_THROW(process(opt, "perfdhcp -6 --or 32,Z0000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithEncapsulationLevel) {
+    CommandOptions opt;
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -A1 --or 1:32,00000E10 -l ethx all"));
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    EXPECT_EQ(1, opt.getRelayOpts().size());
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithNegativeEncapsulationLevel) {
+    CommandOptions opt;
+
+    // provided Relayed option encapsulation level must be a positive integer.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -A1 --or -1:32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithZeroEncapsulationLevel) {
+    CommandOptions opt;
+
+    // provided Relayed option encapsulation level must be a positive integer.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -A1 --or 0:32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithWrongEncapsulationLevel) {
+    CommandOptions opt;
+
+    // provided Relayed option encapsulation level must be a positive integer.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -A1 --or x:32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsWithEncapsulationLevelValueTwo) {
+    CommandOptions opt;
+
+    // Relayed option encapsulation level supports only value 1 at the moment.
+    EXPECT_THROW(process(opt, "perfdhcp -6 -A1 --or 2:32,00000E10 -l ethx all"), isc::InvalidParameter);
+}
+
+TEST_F(CommandOptionsTest, UseRelayV6OptionsDuplicated) {
+    CommandOptions opt;
+
+    // multiple relayed options with the same option code are supported.
+    EXPECT_NO_THROW(process(opt, "perfdhcp -6 -A1 --or 1:32,00000E10  --or 32,00000E11 -l ethx all"));
+    EXPECT_TRUE(opt.isUseRelayedV6());
+    EXPECT_EQ(2, opt.getRelayOpts().size());
+}
+
+
diff --git a/src/bin/perfdhcp/tests/localized_option_unittest.cc b/src/bin/perfdhcp/tests/localized_option_unittest.cc
new file mode 100644
index 0000000..6b849bd
--- /dev/null
+++ b/src/bin/perfdhcp/tests/localized_option_unittest.cc
@@ -0,0 +1,42 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <gtest/gtest.h>
+
+#include <dhcp/option.h>
+#include <dhcp/dhcp6.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include "../localized_option.h"
+
+using namespace std;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+namespace {
+
+TEST(LocalizedOptionTest, Constructor) {
+    OptionBuffer opt_buf;
+    // Create option with default offset.
+    boost::scoped_ptr<LocalizedOption> opt1(new LocalizedOption(Option::V6,
+                                                                D6O_CLIENTID,
+                                                                opt_buf));
+    EXPECT_EQ(Option::V6, opt1->getUniverse());
+    EXPECT_EQ(D6O_CLIENTID, opt1->getType());
+    EXPECT_EQ(0, opt1->getOffset());
+
+    // Create option with non-default offset.
+    boost::scoped_ptr<LocalizedOption> opt2(new LocalizedOption(Option::V6,
+                                                                D6O_CLIENTID,
+                                                                opt_buf,
+                                                                40));
+    EXPECT_EQ(40, opt2->getOffset());
+}
+
+}
diff --git a/src/bin/perfdhcp/tests/packet_storage_unittest.cc b/src/bin/perfdhcp/tests/packet_storage_unittest.cc
new file mode 100644
index 0000000..157da2b
--- /dev/null
+++ b/src/bin/perfdhcp/tests/packet_storage_unittest.cc
@@ -0,0 +1,199 @@
+// Copyright (C) 2013-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "../packet_storage.h"
+#include <dhcp/dhcp6.h>
+#include <dhcp/pkt6.h>
+
+#include <gtest/gtest.h>
+
+namespace {
+
+using namespace isc;
+using namespace isc::dhcp;
+using namespace perfdhcp;
+
+/// @todo Implement the tests which use Pkt4 objects once the support for
+/// DHCPv4 renewals / releases is added.
+
+/// The number of packets in the test storage.
+const unsigned int STORAGE_SIZE = 20;
+
+/// Test fixture class for PacketStorage container testing.
+class PacketStorageTest : public ::testing::Test {
+public:
+    /// \brief Constructor, initializes the storage for each test.
+    PacketStorageTest() {
+        for (uint32_t i = 0; i < STORAGE_SIZE; ++i) {
+            storage_.append(createPacket6(DHCPV6_REPLY, i));
+        }
+    }
+
+    /// \brief Creates an instance of the Pkt6.
+    ///
+    /// \param packet_type A type of the packet.
+    /// \param transid Transaction id.
+    /// \return An instance of the Pkt6.
+    Pkt6Ptr createPacket6(const uint16_t packet_type,
+                          const uint32_t transid) {
+        return (Pkt6Ptr(new Pkt6(packet_type, transid)));
+    }
+
+    /// Packet storage under test.
+    PacketStorage<Pkt6> storage_;
+
+};
+
+// This test verifies that the packets in the storage can be accessed
+// sequentially and when a packet is returned, it is removed from the
+// storage. It also verifies the correctness of the behaviour of the
+// empty() and size() functions.
+TEST_F(PacketStorageTest, getNext) {
+    ASSERT_EQ(STORAGE_SIZE, storage_.size());
+    for (int i = 0; i < STORAGE_SIZE; ++i) {
+        Pkt6Ptr packet = storage_.getNext();
+        ASSERT_TRUE(packet) << "NULL packet returned by storage_.getNext() for"
+                            << " iteration number " << i;
+        EXPECT_EQ(i, packet->getTransid());
+        EXPECT_EQ(STORAGE_SIZE - i - 1, storage_.size());
+    }
+    EXPECT_TRUE(storage_.empty());
+    // When storage is empty, the attempt to get the next packet should
+    // result in returning NULL pointer.
+    EXPECT_FALSE(storage_.getNext());
+    // Let's try it again to see if the previous call to getNext didn't
+    // put the storage into the state in which the subsequent calls to
+    // getNext would result in incorrect behaviour.
+    EXPECT_FALSE(storage_.getNext());
+
+    // Let's add a new packet to the empty storage to check that storage
+    // "recovers" from being empty, i.e. that the internal indicator
+    // which points to current packet reinitializes correctly.
+    storage_.append(createPacket6(DHCPV6_REPLY, 100));
+    ASSERT_EQ(1, storage_.size());
+    Pkt6Ptr packet = storage_.getNext();
+    EXPECT_EQ(100, packet->getTransid());
+    EXPECT_FALSE(storage_.getNext());
+}
+
+// This test verifies that the packets in the storage can be accessed
+// randomly and when a packet is returned, it is removed from the
+// storage. It also verifies the correctness of the behaviour of the
+// empty() and size() functions.
+TEST_F(PacketStorageTest, getRandom) {
+    ASSERT_EQ(STORAGE_SIZE, storage_.size());
+    int cnt_equals = 0;
+    for (int i = 0; i < STORAGE_SIZE; ++i) {
+        Pkt6Ptr packet = storage_.getRandom();
+        ASSERT_TRUE(packet) << "NULL packet returned by storage_.getRandom()"
+            " for iteration number " << i;
+        EXPECT_EQ(STORAGE_SIZE - i - 1, storage_.size());
+        cnt_equals += (i == packet->getTransid() ? 1 : 0);
+    }
+    // If the number of times id is equal to i, is the same as the number
+    // of elements then they were NOT accessed randomly.
+    // The odds of 20 elements being randomly  accessed sequential order
+    // is nil isn't it?
+    EXPECT_NE(cnt_equals, STORAGE_SIZE);
+
+    EXPECT_TRUE(storage_.empty());
+    // When storage is empty, the attempt to get the random packet should
+    // result in returning NULL pointer.
+    EXPECT_FALSE(storage_.getRandom());
+    // Let's try it again to see if the previous call to getRandom didn't
+    // put the storage into the state in which the subsequent calls to
+    // getRandom would result in incorrect behaviour.
+    EXPECT_FALSE(storage_.getRandom());
+
+    // Let's add a new packet to the empty storage to check that storage
+    // "recovers" from being empty, i.e. that the internal indicator
+    // which points to the current packet reinitializes correctly.
+    storage_.append(createPacket6(DHCPV6_REPLY, 100));
+    ASSERT_EQ(1, storage_.size());
+    Pkt6Ptr packet = storage_.getRandom();
+    ASSERT_TRUE(packet);
+    EXPECT_EQ(100, packet->getTransid());
+    EXPECT_FALSE(storage_.getRandom());
+}
+
+// This test verifies that the packets in the storage can be accessed
+// either randomly or sequentially in the same time. It verifies that
+// each returned packet is removed from the storage.
+TEST_F(PacketStorageTest, getNextAndRandom) {
+    ASSERT_EQ(STORAGE_SIZE, storage_.size());
+    for (int i = 0; i < STORAGE_SIZE / 2; ++i) {
+        Pkt6Ptr packet_random = storage_.getRandom();
+        ASSERT_TRUE(packet_random) << "NULL packet returned by"
+            " storage_.getRandom() for iteration number " << i;
+        EXPECT_EQ(STORAGE_SIZE - 2 *i - 1, storage_.size());
+        Pkt6Ptr packet_seq = storage_.getNext();
+        ASSERT_TRUE(packet_seq) << "NULL packet returned by"
+            " storage_.getNext()  for iteration number " << i;
+        EXPECT_EQ(STORAGE_SIZE - 2 * i - 2, storage_.size());
+    }
+    EXPECT_TRUE(storage_.empty());
+    EXPECT_FALSE(storage_.getRandom());
+    EXPECT_FALSE(storage_.getNext());
+
+    // Append two packets to the storage to check if it can "recover"
+    // from being empty and that new elements can be accessed.
+    storage_.append(createPacket6(DHCPV6_REPLY, 100));
+    storage_.append(createPacket6(DHCPV6_REPLY, 101));
+    ASSERT_EQ(2, storage_.size());
+    // The newly added elements haven't been accessed yet. So, if we
+    // call getNext the first one should be returned.
+    Pkt6Ptr packet_next = storage_.getNext();
+    ASSERT_TRUE(packet_next);
+    // The first packet has transaction id equal to 100.
+    EXPECT_EQ(100, packet_next->getTransid());
+    // There should be just one packet left in the storage.
+    ASSERT_EQ(1, storage_.size());
+    // The call to getRandom should return the sole packet from the
+    // storage.
+    Pkt6Ptr packet_random = storage_.getRandom();
+    ASSERT_TRUE(packet_random);
+    EXPECT_EQ(101, packet_random->getTransid());
+    // Any further calls to getRandom and getNext should return NULL.
+    EXPECT_FALSE(storage_.getRandom());
+    EXPECT_FALSE(storage_.getNext());
+}
+
+// This test verifies that all packets are removed from the storage when
+// clear() function is invoked.
+TEST_F(PacketStorageTest, clearAll) {
+    ASSERT_EQ(STORAGE_SIZE, storage_.size());
+    ASSERT_NO_THROW(storage_.clear());
+    EXPECT_TRUE(storage_.empty());
+}
+
+// This test verifies that a set of packets can be removed from the
+// storage when a number of packets to be removed is specified. If
+// number of packets to be removed exceeds the storage size, all
+// packets should be removed.
+TEST_F(PacketStorageTest, clear) {
+    // Initially storage should have 20 elements.
+    ASSERT_EQ(STORAGE_SIZE, storage_.size());
+    // Remove 10 of them.
+    ASSERT_NO_THROW(storage_.clear(10));
+    // We should have 10 remaining.
+    ASSERT_EQ(10, storage_.size());
+
+    // Check that the retrieval still works after partial clear.
+    EXPECT_TRUE(storage_.getNext());
+    EXPECT_TRUE(storage_.getRandom());
+    // We should have 10 - 2 = 8 packets in the storage after retrieval.
+    ASSERT_EQ(8, storage_.size());
+
+    // Try to remove more elements that actually is. It
+    // should result in removal of all elements.
+    ASSERT_NO_THROW(storage_.clear(15));
+    EXPECT_TRUE(storage_.empty());
+}
+
+
+} // anonymous namespace
diff --git a/src/bin/perfdhcp/tests/perf_pkt4_unittest.cc b/src/bin/perfdhcp/tests/perf_pkt4_unittest.cc
new file mode 100644
index 0000000..b162051
--- /dev/null
+++ b/src/bin/perfdhcp/tests/perf_pkt4_unittest.cc
@@ -0,0 +1,425 @@
+// Copyright (C) 2012-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <iostream>
+#include <sstream>
+#include <arpa/inet.h>
+#include <gtest/gtest.h>
+
+#include <asiolink/io_address.h>
+#include <dhcp/option.h>
+#include <dhcp/dhcp4.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include "../localized_option.h"
+#include "../perf_pkt4.h"
+
+using namespace std;
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+typedef PerfPkt4::LocalizedOptionPtr LocalizedOptionPtr;
+
+namespace {
+
+// A dummy MAC address, padded with 0s
+const uint8_t dummyChaddr[16] = {0, 1, 2, 3, 4, 5, 0, 0,
+                                 0, 0, 0, 0, 0, 0, 0, 0 };
+
+// Let's use some creative test content here (128 chars + \0)
+const uint8_t dummyFile[] = "Lorem ipsum dolor sit amet, consectetur "
+    "adipiscing elit. Proin mollis placerat metus, at "
+    "lacinia orci ornare vitae. Mauris amet.";
+
+// Yet another type of test content (64 chars + \0)
+const uint8_t dummySname[] = "Lorem ipsum dolor sit amet, consectetur "
+    "adipiscing elit posuere.";
+
+class PerfPkt4Test : public ::testing::Test {
+public:
+    PerfPkt4Test() {
+    }
+
+    /// \brief Returns buffer with sample DHCPDISCOVER message.
+    ///
+    /// This method creates buffer containing on-wire data of
+    /// DHCPDICOSVER message. This buffer is used by tests below
+    /// to create DHCPv4 test packets.
+    ///
+    /// \return vector containing on-wire data
+    std::vector<uint8_t>& capture() {
+
+        // That is only part of the header. It contains all "short" fields,
+        // larger fields are constructed separately.
+        uint8_t hdr[] = {
+            1, 6, 6, 13,            // op, htype, hlen, hops,
+            0x12, 0x34, 0x56, 0x78, // transaction-id
+            0, 42, 0x80, 0x00,      // 42 secs, BROADCAST flags
+            192, 0, 2, 1,           // ciaddr
+            1, 2, 3, 4,             // yiaddr
+            192, 0, 2, 255,         // siaddr
+            255, 255, 255, 255,     // giaddr
+        };
+
+        // cppcheck-suppress variableScope
+        uint8_t v4Opts[] = {
+            DHO_HOST_NAME, 3, 0,   1,  2,  // Host name option.
+            DHO_BOOT_SIZE, 3, 10, 11, 12,  // Boot file size option
+            DHO_MERIT_DUMP, 3, 20, 21, 22, // Merit dump file
+            DHO_DHCP_MESSAGE_TYPE, 1, 1,   // DHCP message type.
+            128, 3, 30, 31, 32,
+            254, 3, 40, 41, 42,
+        };
+
+        // Initialize the vector with the header fields defined above.
+        static std::vector<uint8_t> buf(hdr, hdr + sizeof(hdr));
+
+        // If this is a first call to this function. Initialize
+        // remaining data.
+        if (buf.size() == sizeof(hdr)) {
+
+            // Append the large header fields.
+            std::copy(dummyChaddr, dummyChaddr + Pkt4::MAX_CHADDR_LEN,
+                      back_inserter(buf));
+            std::copy(dummySname, dummySname + Pkt4::MAX_SNAME_LEN,
+                      back_inserter(buf));
+            std::copy(dummyFile, dummyFile + Pkt4::MAX_FILE_LEN,
+                      back_inserter(buf));
+
+            // Append magic cookie.
+            buf.push_back(0x63);
+            buf.push_back(0x82);
+            buf.push_back(0x53);
+            buf.push_back(0x63);
+
+            // Append options.
+            std::copy(v4Opts, v4Opts + sizeof(v4Opts), back_inserter(buf));
+        }
+        return buf;
+    }
+};
+
+TEST_F(PerfPkt4Test, Constructor) {
+    // Initialize some dummy payload.
+    uint8_t data[250];
+    for (uint8_t i = 0; i < 250; ++i) {
+        data[i] = i;
+    }
+
+    // Test constructor to be used for incoming messages.
+    // Use default (1) offset value and don't specify transaction id.
+    const size_t offset_transid[] = { 1, 10 };
+    boost::scoped_ptr<PerfPkt4> pkt1(new PerfPkt4(data,
+                                                  sizeof(data),
+                                                  offset_transid[0]));
+    EXPECT_EQ(1, pkt1->getTransidOffset());
+
+    // Test constructor to be used for outgoing messages.
+    // Use non-zero offset and specify transaction id.
+    const uint32_t transid = 0x010203;
+    boost::scoped_ptr<PerfPkt4> pkt2(new PerfPkt4(data, sizeof(data),
+                                                  offset_transid[1],
+                                                  transid));
+    EXPECT_EQ(transid, pkt2->getTransid());
+    EXPECT_EQ(offset_transid[1], pkt2->getTransidOffset());
+
+    // Test default constructor. Transaction id offset is expected to be 1.
+    boost::scoped_ptr<PerfPkt4> pkt3(new PerfPkt4(data, sizeof(data)));
+    EXPECT_EQ(1, pkt3->getTransidOffset());
+}
+
+TEST_F(PerfPkt4Test, RawPack) {
+    // Create new packet.
+    std::vector<uint8_t> buf = capture();
+    boost::scoped_ptr<PerfPkt4> pkt(new PerfPkt4(&buf[0], buf.size()));
+
+    // Initialize options data.
+    uint8_t buf_hostname[] = { DHO_HOST_NAME, 3, 4, 5, 6 };
+    uint8_t buf_boot_filesize[] = { DHO_BOOT_SIZE, 3, 1, 2, 3 };
+    OptionBuffer vec_hostname(buf_hostname + 2,
+                              buf_hostname + sizeof(buf_hostname));
+    OptionBuffer vec_boot_filesize(buf_boot_filesize + 2,
+                                   buf_boot_filesize + sizeof(buf_hostname));
+
+    // Create options objects.
+    const size_t offset_hostname = 240;
+    LocalizedOptionPtr pkt_hostname(new LocalizedOption(Option::V4,
+                                                        DHO_HOST_NAME,
+                                                        vec_hostname,
+                                                        offset_hostname));
+    const size_t offset_boot_filesize = 245;
+    LocalizedOptionPtr pkt_boot_filesize(new LocalizedOption(Option::V4,
+                                                             DHO_BOOT_SIZE,
+                                                             vec_boot_filesize,
+                                                             offset_boot_filesize));
+
+    // Try to add options to packet.
+    ASSERT_NO_THROW(pkt->addOption(pkt_boot_filesize));
+    ASSERT_NO_THROW(pkt->addOption(pkt_hostname));
+
+    // We have valid options addedwith valid offsets so
+    // pack operation should succeed.
+    ASSERT_TRUE(pkt->rawPack());
+
+    // Buffer should now contain new values of DHO_HOST_NAME and
+    // DHO_BOOT_SIZE options.
+    util::OutputBuffer pkt_output = pkt->getBuffer();
+    ASSERT_EQ(buf.size(), pkt_output.getLength());
+    const uint8_t* out_buf_data =
+        static_cast<const uint8_t*>(pkt_output.getData());
+
+    // Check if options we read from buffer is valid.
+    EXPECT_EQ(0, memcmp(buf_hostname,
+                        out_buf_data + offset_hostname,
+                        sizeof(buf_hostname)));
+    EXPECT_EQ(0, memcmp(buf_boot_filesize,
+                        out_buf_data + offset_boot_filesize,
+                        sizeof(buf_boot_filesize)));
+}
+
+TEST_F(PerfPkt4Test, RawUnpack) {
+    // Create new packet.
+    std::vector<uint8_t> buf = capture();
+    boost::scoped_ptr<PerfPkt4> pkt(new PerfPkt4(&buf[0], buf.size()));
+
+    // Create options (existing in the packet) and specify their offsets.
+    const size_t offset_merit = 250;
+    LocalizedOptionPtr opt_merit(new LocalizedOption(Option::V4,
+                                                     DHO_MERIT_DUMP,
+                                                     OptionBuffer(),
+                                                     offset_merit));
+
+    const size_t  offset_msg_type = 255;
+    LocalizedOptionPtr opt_msg_type(new LocalizedOption(Option::V4,
+                                                        DHO_DHCP_MESSAGE_TYPE,
+                                                        OptionBuffer(),
+                                                        offset_msg_type));
+    // Addition should be successful
+    ASSERT_NO_THROW(pkt->addOption(opt_merit));
+    ASSERT_NO_THROW(pkt->addOption(opt_msg_type));
+
+    // Option fit to packet boundaries and offsets are valid,
+    // so this should unpack successfully.
+    ASSERT_TRUE(pkt->rawUnpack());
+
+    // At this point we should have updated options data (read from buffer).
+    // Let's try to retrieve them.
+    opt_merit = boost::dynamic_pointer_cast<LocalizedOption>
+        (pkt->getOption(DHO_MERIT_DUMP));
+    opt_msg_type = boost::dynamic_pointer_cast<LocalizedOption>
+        (pkt->getOption(DHO_DHCP_MESSAGE_TYPE));
+    ASSERT_TRUE(opt_merit);
+    ASSERT_TRUE(opt_msg_type);
+
+    // Get first option payload.
+    OptionBuffer opt_merit_data = opt_merit->getData();
+
+    // Define reference data.
+    uint8_t buf_merit[] = { 20, 21, 22 };
+
+    // Validate first option data.
+    ASSERT_EQ(sizeof(buf_merit), opt_merit_data.size());
+    EXPECT_TRUE(std::equal(opt_merit_data.begin(),
+                           opt_merit_data.end(),
+                           buf_merit));
+
+    // Get second option payload.
+    OptionBuffer opt_msg_type_data = opt_msg_type->getData();
+
+    // Expect one byte of message type payload.
+    ASSERT_EQ(1, opt_msg_type_data.size());
+    EXPECT_EQ(1, opt_msg_type_data[0]);
+}
+
+TEST_F(PerfPkt4Test, InvalidOptions) {
+    // Create new packet.
+    std::vector<uint8_t> buf = capture();
+    boost::scoped_ptr<PerfPkt4> pkt1(new PerfPkt4(&buf[0], buf.size()));
+
+    // Create option with invalid offset.
+    // This option is at offset 250 (not 251).
+    const size_t offset_merit = 251;
+    LocalizedOptionPtr opt_merit(new LocalizedOption(Option::V4,
+                                                     DHO_MERIT_DUMP,
+                                                     OptionBuffer(),
+                                                     offset_merit));
+    ASSERT_NO_THROW(pkt1->addOption(opt_merit));
+
+    cout << "Testing unpack of invalid options. "
+         << "This may produce spurious errors." << endl;
+
+    // Unpack is expected to fail because it is supposed to read
+    // option type from buffer and match it with DHO_MERIT_DUMP.
+    // It will not match because option is shifted by on byte.
+    ASSERT_FALSE(pkt1->rawUnpack());
+
+    // Create another packet.
+    boost::scoped_ptr<PerfPkt4> pkt2(new PerfPkt4(&buf[0], buf.size()));
+
+    // Create DHO_DHCP_MESSAGE_TYPE option that has the wrong offset.
+    // With this offset, option goes beyond packet size (268).
+    const size_t offset_msg_type = 266;
+    LocalizedOptionPtr opt_msg_type(new LocalizedOption(Option::V4,
+                                                        DHO_DHCP_MESSAGE_TYPE,
+                                                        OptionBuffer(1, 2),
+                                                        offset_msg_type));
+    // Adding option is expected to be successful because no
+    // offset validation takes place at this point.
+    ASSERT_NO_THROW(pkt2->addOption(opt_msg_type));
+
+    // This is expected to fail because option is out of bounds.
+    ASSERT_FALSE(pkt2->rawPack());
+}
+
+TEST_F(PerfPkt4Test, TruncatedPacket) {
+    // Get the whole packet and truncate it to 249 bytes.
+    std::vector<uint8_t> buf = capture();
+    buf.resize(249);
+    boost::scoped_ptr<PerfPkt4> pkt(new PerfPkt4(&buf[0], buf.size()));
+
+    // Option DHO_BOOT_SIZE is now truncated because whole packet
+    // is truncated. This option ends at 249 while last index of
+    // truncated packet is now 248.
+    const size_t offset_boot_filesize = 245;
+    LocalizedOptionPtr opt_boot_filesize(new LocalizedOption(Option::V4,
+                                                             DHO_BOOT_SIZE,
+                                                             OptionBuffer(3, 1),
+                                                             offset_boot_filesize));
+    ASSERT_NO_THROW(pkt->addOption(opt_boot_filesize));
+
+    cout << "Testing pack and unpack of options in truncated "
+         << "packet. This may produce spurious errors." << endl;
+
+    // Both pack and unpack are expected to fail because
+    // added option is out of bounds.
+    EXPECT_FALSE(pkt->rawUnpack());
+    EXPECT_FALSE(pkt->rawPack());
+}
+
+TEST_F(PerfPkt4Test, PackTransactionId) {
+    // Create dummy packet that consists of zeros.
+    std::vector<uint8_t> buf(268, 0);
+
+    const size_t offset_transid[] = { 10, 265 };
+    const uint32_t transid = 0x0102;
+    // Initialize transaction id 0x00000102 at offset 10.
+    boost::scoped_ptr<PerfPkt4> pkt1(new PerfPkt4(&buf[0], buf.size(),
+                                                  offset_transid[0],
+                                                  transid));
+
+    // Pack will inject transaction id at offset 10 into the
+    // packet buffer.
+    ASSERT_TRUE(pkt1->rawPack());
+
+    // Get packet's output buffer and make sure it has valid size.
+    util::OutputBuffer out_buf = pkt1->getBuffer();
+    ASSERT_EQ(buf.size(), out_buf.getLength());
+    const uint8_t *out_buf_data =
+        static_cast<const uint8_t*>(out_buf.getData());
+
+    // Initialize reference data for transaction id.
+    const uint8_t ref_data[] = { 0, 0, 1, 2 };
+
+    // Expect that reference transaction id matches what we have
+    // read from buffer.
+    EXPECT_EQ(0, memcmp(ref_data, out_buf_data + offset_transid[0], 4));
+
+    cout << "Testing pack with invalid transaction id offset. "
+         << "This may produce spurious errors" << endl;
+
+    // Create packet with invalid transaction id offset.
+    // Packet length is 268, transaction id is 4 bytes long so last byte of
+    // transaction id is out of bounds.
+    boost::scoped_ptr<PerfPkt4> pkt2(new PerfPkt4(&buf[0], buf.size(),
+                                                  offset_transid[1],
+                                                  transid));
+    EXPECT_FALSE(pkt2->rawPack());
+}
+
+TEST_F(PerfPkt4Test, UnpackTransactionId) {
+    // Initialize packet data, length 268, zeros only.
+    std::vector<uint8_t> in_data(268, 0);
+
+    // Assume that transaction id is at offset 100.
+    // Fill 4 bytes at offset 100 with dummy transaction id.
+    for (uint8_t i = 100; i < 104; ++i) {
+        in_data[i] = i - 99;
+    }
+
+    // Create packet from initialized buffer.
+    const size_t offset_transid[] = { 100, 270 };
+    boost::scoped_ptr<PerfPkt4> pkt1(new PerfPkt4(&in_data[0],
+                                                  in_data.size(),
+                                                  offset_transid[0]));
+    ASSERT_TRUE(pkt1->rawUnpack());
+
+    // Get unpacked transaction id and compare with reference.
+    EXPECT_EQ(0x01020304, pkt1->getTransid());
+
+    // Create packet with transaction id at invalid offset.
+    boost::scoped_ptr<PerfPkt4> pkt2(new PerfPkt4(&in_data[0],
+                                                  in_data.size(),
+                                                  offset_transid[1]));
+
+    cout << "Testing unpack of transaction id at invalid offset. "
+         << "This may produce spurious errors." << endl;
+
+    // Unpack is supposed to fail because transaction id is at
+    // out of bounds offset.
+    EXPECT_FALSE(pkt2->rawUnpack());
+}
+
+TEST_F(PerfPkt4Test, Writes) {
+    // Initialize input buffer with 260 elements set to value 1.
+    dhcp::OptionBuffer in_data(260, 1);
+    // Initialize buffer to be used for write: 1,2,3,4,...,9
+    dhcp::OptionBuffer write_buf(10);
+    for (size_t i = 0; i < write_buf.size(); ++i) {
+        write_buf[i] = i;
+    }
+    // Create packet from the input buffer.
+    const size_t transid_offset = 4;
+    boost::scoped_ptr<PerfPkt4> pkt1(new PerfPkt4(&in_data[0],
+                                                  in_data.size(),
+                                                  transid_offset));
+    // Write numbers 4,5,6,7 to the packet's input buffer at position 10.
+    pkt1->writeAt(10, write_buf.begin() + 3, write_buf.begin() + 7);
+    // We have to pack data to output buffer here because Pkt4 provides no
+    // way to retrieve input buffer. If we pack data it will go to
+    // output buffer that has getter available.
+    ASSERT_TRUE(pkt1->rawPack());
+    const util::OutputBuffer& out_buf = pkt1->getBuffer();
+    ASSERT_EQ(in_data.size(), out_buf.getLength());
+    // Verify that 4,5,6,7 has been written to the packet's buffer.
+    const char* out_data = static_cast<const char*>(out_buf.getData());
+    EXPECT_TRUE(std::equal(write_buf.begin() + 3, write_buf.begin() + 7,
+                          out_data + 10));
+    // Write 1 octet (0x51) at position 10.
+    pkt1->writeValueAt<uint8_t>(10, 0x51);
+    ASSERT_TRUE(pkt1->rawPack());
+    ASSERT_EQ(in_data.size(), pkt1->getBuffer().getLength());
+    EXPECT_EQ(0x51, pkt1->getBuffer()[10]);
+    // Write 2 octets (0x5251) at position 20.
+    pkt1->writeValueAt<uint16_t>(20, 0x5251);
+    ASSERT_TRUE(pkt1->rawPack());
+    ASSERT_EQ(in_data.size(), pkt1->getBuffer().getLength());
+    EXPECT_EQ(0x52, pkt1->getBuffer()[20]);
+    EXPECT_EQ(0x51, pkt1->getBuffer()[21]);
+    // Write 4 octets (0x54535251) at position 30.
+    pkt1->writeValueAt<uint32_t>(30, 0x54535251);
+    ASSERT_TRUE(pkt1->rawPack());
+    ASSERT_EQ(in_data.size(), pkt1->getBuffer().getLength());
+    EXPECT_EQ(0x54, pkt1->getBuffer()[30]);
+    EXPECT_EQ(0x53, pkt1->getBuffer()[31]);
+    EXPECT_EQ(0x52, pkt1->getBuffer()[32]);
+    EXPECT_EQ(0x51, pkt1->getBuffer()[33]);
+}
+
+}
diff --git a/src/bin/perfdhcp/tests/perf_pkt6_unittest.cc b/src/bin/perfdhcp/tests/perf_pkt6_unittest.cc
new file mode 100644
index 0000000..f4e5b41
--- /dev/null
+++ b/src/bin/perfdhcp/tests/perf_pkt6_unittest.cc
@@ -0,0 +1,324 @@
+// Copyright (C) 2012-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <iostream>
+#include <sstream>
+#include <arpa/inet.h>
+#include <gtest/gtest.h>
+
+#include <asiolink/io_address.h>
+#include <dhcp/option.h>
+#include <dhcp/dhcp6.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include "../localized_option.h"
+#include "../perf_pkt6.h"
+
+using namespace std;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+typedef PerfPkt6::LocalizedOptionPtr LocalizedOptionPtr;
+
+namespace {
+
+class PerfPkt6Test : public ::testing::Test {
+public:
+    PerfPkt6Test() {
+    }
+
+    /// \brief Returns captured SOLICIT packet.
+    ///
+    /// Captured SOLICIT packet with transid=0x3d79fb and options: client-id,
+    /// in_na, dns-server, elapsed-time, option-request
+    /// This code was autogenerated
+    /// (see src/bin/dhcp6/tests/iface_mgr_unittest.c),
+    /// but we spent some time to make is less ugly than it used to be.
+    ///
+    /// \return pointer to Pkt6 that represents received SOLICIT
+    PerfPkt6* capture() {
+        uint8_t data[98];
+        data[0]  = 1;
+        data[1]  = 1;       data[2]  = 2;     data[3] = 3;      data[4]  = 0;
+        data[5]  = 1;       data[6]  = 0;     data[7] = 14;     data[8]  = 0;
+        data[9]  = 1;       data[10] = 0;     data[11] = 1;     data[12] = 21;
+        data[13] = 158;     data[14] = 60;    data[15] = 22;    data[16] = 0;
+        data[17] = 30;      data[18] = 140;   data[19] = 155;   data[20] = 115;
+        data[21] = 73;      data[22] = 0;     data[23] = 3;     data[24] = 0;
+        data[25] = 40;      data[26] = 0;     data[27] = 0;     data[28] = 0;
+        data[29] = 1;       data[30] = 255;   data[31] = 255;   data[32] = 255;
+        data[33] = 255;     data[34] = 255;   data[35] = 255;   data[36] = 255;
+        data[37] = 255;     data[38] = 0;     data[39] = 5;     data[40] = 0;
+        data[41] = 24;      data[42] = 32;    data[43] = 1;     data[44] = 13;
+        data[45] = 184;     data[46] = 0;     data[47] = 1;     data[48] = 0;
+        data[49] = 0;       data[50] = 0;     data[51] = 0;     data[52] = 0;
+        data[53] = 0;       data[54] = 0;     data[55] = 0;     data[56] = 18;
+        data[57] = 52;      data[58] = 255;   data[59] = 255;   data[60] = 255;
+        data[61] = 255;     data[62] = 255;   data[63] = 255;   data[64] = 255;
+        data[65] = 255;     data[66] = 0;     data[67] = 23;    data[68] = 0;
+        data[69] = 16;      data[70] = 32;    data[71] = 1;     data[72] = 13;
+        data[73] = 184;     data[74] = 0;     data[75] = 1;     data[76] = 0;
+        data[77] = 0;       data[78] = 0;     data[79] = 0;     data[80] = 0;
+        data[81] = 0;       data[82] = 0;     data[83] = 0;     data[84] = 221;
+        data[85] = 221;     data[86] = 0;     data[87] = 8;     data[88] = 0;
+        data[89] = 2;       data[90] = 0;     data[91] = 100;   data[92] = 0;
+        data[93] = 6;       data[94] = 0;     data[95] = 2;     data[96] = 0;
+        data[97] = 23;
+
+        PerfPkt6* pkt = new PerfPkt6(data, sizeof(data));
+
+        return (pkt);
+    }
+
+    /// \brief Returns truncated SOLICIT packet.
+    ///
+    /// Returns truncated SOLICIT packet which will be used for
+    /// negative tests: e.g. pack options out of packet.
+    ///
+    /// \return pointer to Pkt6 that represents truncated SOLICIT
+    PerfPkt6* captureTruncated() {
+        uint8_t data[17];
+        data[0]  = 1;
+        data[1]  = 1;       data[2]  = 2;     data[3] = 3;      data[4]  = 0;
+        data[5]  = 1;       data[6]  = 0;     data[7] = 14;     data[8]  = 0;
+        data[9]  = 1;       data[10] = 0;     data[11] = 1;     data[12] = 21;
+        data[13] = 158;     data[14] = 60;    data[15] = 22;    data[16] = 0;
+
+        PerfPkt6* pkt = new PerfPkt6(data, sizeof(data));
+
+        return (pkt);
+    }
+
+
+};
+
+TEST_F(PerfPkt6Test, Constructor) {
+    // Data to be used to create packet.
+    uint8_t data[] = { 0, 1, 2, 3, 4, 5 };
+
+    // Test constructor to be used for incoming messages.
+    // Use default (1) offset value and don't specify transaction id.
+    boost::scoped_ptr<PerfPkt6> pkt1(new PerfPkt6(data, sizeof(data)));
+    EXPECT_EQ(sizeof(data), pkt1->data_.size());
+    EXPECT_EQ(0, memcmp(&pkt1->data_[0], data, sizeof(data)));
+    EXPECT_EQ(1, pkt1->getTransidOffset());
+
+    // Test constructor to be used for outgoing messages.
+    // Use non-zero offset and specify transaction id.
+    const size_t offset_transid = 10;
+    const uint32_t transid = 0x010203;
+    boost::scoped_ptr<PerfPkt6> pkt2(new PerfPkt6(data, sizeof(data),
+                                                  offset_transid, transid));
+    EXPECT_EQ(sizeof(data), pkt2->data_.size());
+    EXPECT_EQ(0, memcmp(&pkt2->data_[0], data, sizeof(data)));
+    EXPECT_EQ(0x010203, pkt2->getTransid());
+    EXPECT_EQ(10, pkt2->getTransidOffset());
+}
+
+TEST_F(PerfPkt6Test, RawPackUnpack) {
+    // Create first packet.
+    boost::scoped_ptr<PerfPkt6> pkt1(capture());
+
+    // Create some input buffers to initialize options.
+    uint8_t buf_elapsed_time[] = { 1, 1 };
+    uint8_t buf_duid[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
+
+    // Create options.
+    const size_t offset_elapsed_time = 86;
+    OptionBuffer vec_elapsed_time(buf_elapsed_time,
+                                  buf_elapsed_time + sizeof(buf_elapsed_time));
+    LocalizedOptionPtr pkt1_elapsed_time(new LocalizedOption(Option::V6,
+                                                             D6O_ELAPSED_TIME,
+                                                             vec_elapsed_time,
+                                                             offset_elapsed_time));
+    const size_t offset_duid = 4;
+    OptionBuffer vec_duid(buf_duid, buf_duid + sizeof(buf_duid));
+    LocalizedOptionPtr pkt1_duid(new LocalizedOption(Option::V6,
+                                                     D6O_CLIENTID,
+                                                     vec_duid,
+                                                     offset_duid));
+
+    // Add option to packet and create on-wire format from added options.
+    // Contents of options will override contents of packet buffer.
+    ASSERT_NO_THROW(pkt1->addOption(pkt1_elapsed_time));
+    ASSERT_NO_THROW(pkt1->addOption(pkt1_duid));
+    ASSERT_TRUE(pkt1->rawPack());
+
+    // Reset so as we can reuse them for another packet.
+    vec_elapsed_time.clear();
+    vec_duid.clear();
+
+    // Get output buffer from packet 1 to create new packet
+    // that will be later validated.
+    util::OutputBuffer pkt1_output = pkt1->getBuffer();
+    ASSERT_EQ(pkt1_output.getLength(), pkt1->data_.size());
+    const uint8_t* pkt1_output_data = static_cast<const uint8_t*>
+        (pkt1_output.getData());
+    boost::scoped_ptr<PerfPkt6> pkt2(new PerfPkt6(pkt1_output_data,
+                                                  pkt1_output.getLength()));
+
+    // Create objects specifying options offset in a packet.
+    // Offsets will inform pkt2 object where to read data from.
+    LocalizedOptionPtr pkt2_elapsed_time(new LocalizedOption(Option::V6,
+                                                             D6O_ELAPSED_TIME,
+                                                             vec_elapsed_time,
+                                                             offset_elapsed_time));
+    LocalizedOptionPtr pkt2_duid(new LocalizedOption(Option::V6,
+                                                     D6O_CLIENTID,
+                                                     vec_duid,
+                                                     offset_duid));
+    // Add options to packet to pass their offsets.
+    pkt2->addOption(pkt2_elapsed_time);
+    pkt2->addOption(pkt2_duid);
+
+    // Unpack: get relevant parts of buffer data into option objects.
+    ASSERT_TRUE(pkt2->rawUnpack());
+
+    // Once option data is stored in options objects we pull it out.
+    pkt2_elapsed_time = boost::dynamic_pointer_cast<LocalizedOption>
+        (pkt2->getOption(D6O_ELAPSED_TIME));
+    pkt2_duid = boost::dynamic_pointer_cast<LocalizedOption>
+        (pkt2->getOption(D6O_CLIENTID));
+
+    // Check if options are present. They have to be there since
+    // we have added them ourselfs.
+    ASSERT_TRUE(pkt2_elapsed_time);
+    ASSERT_TRUE(pkt2_duid);
+
+    // Expecting option contents be the same as original.
+    OptionBuffer pkt2_elapsed_time_data = pkt2_elapsed_time->getData();
+    OptionBuffer pkt2_duid_data = pkt2_duid->getData();
+    EXPECT_EQ(0x0101, pkt2_elapsed_time->getUint16());
+    EXPECT_TRUE(std::equal(pkt2_duid_data.begin(),
+                           pkt2_duid_data.end(),
+                           buf_duid));
+}
+
+TEST_F(PerfPkt6Test, InvalidOptions) {
+    // Create packet.
+    boost::scoped_ptr<PerfPkt6> pkt1(capture());
+    OptionBuffer vec_server_id;
+    vec_server_id.resize(10);
+    // Testing invalid offset of the option (greater than packet size)
+    const size_t offset_serverid[] = { 150, 85 };
+    LocalizedOptionPtr pkt1_serverid(new LocalizedOption(Option::V6,
+                                                         D6O_SERVERID,
+                                                         vec_server_id,
+                                                         offset_serverid[0]));
+    pkt1->addOption(pkt1_serverid);
+    // Pack has to fail due to invalid offset.
+    EXPECT_FALSE(pkt1->rawPack());
+
+    // Create packet.
+    boost::scoped_ptr<PerfPkt6> pkt2(capture());
+    // Testing offset of the option (lower than packet size but
+    // tail of the option out of bounds).
+    LocalizedOptionPtr pkt2_serverid(new LocalizedOption(Option::V6,
+                                                         D6O_SERVERID,
+                                                         vec_server_id,
+                                                         offset_serverid[1]));
+    pkt2->addOption(pkt2_serverid);
+    // Pack must fail due to invalid offset.
+    EXPECT_FALSE(pkt2->rawPack());
+}
+
+
+TEST_F(PerfPkt6Test, TruncatedPacket) {
+    cout << "Testing parsing options from truncated packet."
+         << "This may produce spurious errors" << endl;
+
+    // Create truncated (in the middle of duid options)
+    boost::scoped_ptr<PerfPkt6> pkt1(captureTruncated());
+    OptionBuffer vec_duid;
+    vec_duid.resize(30);
+    const size_t offset_duid = 4;
+    LocalizedOptionPtr pkt1_duid(new LocalizedOption(Option::V6,
+                                                     D6O_CLIENTID,
+                                                     vec_duid,
+                                                     offset_duid));
+    pkt1->addOption(pkt1_duid);
+    // Pack/unpack must fail because length of the option read from buffer
+    // will extend over the actual packet length.
+    EXPECT_FALSE(pkt1->rawUnpack());
+    EXPECT_FALSE(pkt1->rawPack());
+}
+
+TEST_F(PerfPkt6Test, PackTransactionId) {
+    uint8_t data[100];
+    memset(&data, 0, sizeof(data));
+
+    const size_t offset_transid[] = { 50, 100 };
+    const uint32_t transid = 0x010203;
+
+    // Create dummy packet that is simply filled with zeros.
+    boost::scoped_ptr<PerfPkt6> pkt1(new PerfPkt6(data,
+                                                  sizeof(data),
+                                                  offset_transid[0],
+                                                  transid));
+
+    // Reference data are non zero so we can detect them in dummy packet.
+    uint8_t ref_data[3] = { 1, 2, 3 };
+
+    // This will store given transaction id in the packet data at
+    // offset of 50.
+    ASSERT_TRUE(pkt1->rawPack());
+
+    // Get the output buffer so we can validate it.
+    util::OutputBuffer out_buf = pkt1->getBuffer();
+    ASSERT_EQ(sizeof(data), out_buf.getLength());
+    const uint8_t *out_buf_data = static_cast<const uint8_t*>
+        (out_buf.getData());
+
+    // Try to make clang static analyzer happy.
+    ASSERT_LE(offset_transid[0], out_buf.getLength());
+
+    // Validate transaction id.
+    EXPECT_EQ(0, memcmp(ref_data, out_buf_data + offset_transid[0], 3));
+
+
+    // Out of bounds transaction id offset.
+    boost::scoped_ptr<PerfPkt6> pkt2(new PerfPkt6(data,
+                                                  sizeof(data),
+                                                  offset_transid[1],
+                                                  transid));
+    cout << "Testing out of bounds offset. "
+        "This may produce spurious errors ..." << endl;
+    EXPECT_FALSE(pkt2->rawPack());
+}
+
+TEST_F(PerfPkt6Test, UnpackTransactionId) {
+    // Initialize data for dummy packet (zeros only).
+    uint8_t data[100] = { 0 };
+
+    // Generate transaction id = 0x010203 and inject at offset = 50.
+    for (uint8_t i = 50; i <  53; ++i) {
+        data[i] = i - 49;
+    }
+    // Create packet and point out that transaction id is at offset 50.
+    const size_t offset_transid[] = { 50, 300 };
+    boost::scoped_ptr<PerfPkt6> pkt1(new PerfPkt6(data,
+                                                  sizeof(data),
+                                                  offset_transid[0]));
+
+    // Get transaction id out of buffer and store in class member.
+    ASSERT_TRUE(pkt1->rawUnpack());
+    // Test value of transaction id.
+    EXPECT_EQ(0x010203, pkt1->getTransid());
+
+    // Out of bounds transaction id offset.
+    boost::scoped_ptr<PerfPkt6> pkt2(new PerfPkt6(data,
+                                                  sizeof(data),
+                                                  offset_transid[1]));
+    cout << "Testing out of bounds offset. "
+        "This may produce spurious errors ..." << endl;
+    EXPECT_FALSE(pkt2->rawUnpack());
+
+}
+
+}
diff --git a/src/bin/perfdhcp/tests/perf_socket_unittest.cc b/src/bin/perfdhcp/tests/perf_socket_unittest.cc
new file mode 100644
index 0000000..39a2db9
--- /dev/null
+++ b/src/bin/perfdhcp/tests/perf_socket_unittest.cc
@@ -0,0 +1,58 @@
+// Copyright (C) 2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "command_options_helper.h"
+#include "../perf_socket.h"
+
+#include <asiolink/io_address.h>
+#include <exceptions/exceptions.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/iface_mgr.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/foreach.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <stdint.h>
+#include <string>
+#include <fstream>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+
+/// \brief Test Fixture Class
+///
+/// This test fixture class is used to perform
+/// unit tests on perfdhcp PerfSocketTest class.
+class PerfSocketTest : public virtual ::testing::Test
+{
+public:
+    PerfSocketTest() { }
+};
+
+
+TEST_F(PerfSocketTest, WrongCommandOptions) {
+    // Check if incorrect command options are casing failure during
+    // socket setup.
+    CommandOptions opt;
+
+    // make sure we catch -6 paired with v4 address
+    CommandOptionsHelper::process(opt, "perfdhcp -l 127.0.0.1 -6 192.168.1.1");
+    EXPECT_THROW(PerfSocket sock(opt), isc::InvalidParameter);
+
+    // make sure we catch -4 paired with v6 address
+    CommandOptionsHelper::process(opt, "perfdhcp -l 127.0.0.1 -4 ff02::1:2");
+    EXPECT_THROW(PerfSocket sock(opt), isc::InvalidParameter);
+}
diff --git a/src/bin/perfdhcp/tests/random_number_generator_unittest.cc b/src/bin/perfdhcp/tests/random_number_generator_unittest.cc
new file mode 100644
index 0000000..58da955
--- /dev/null
+++ b/src/bin/perfdhcp/tests/random_number_generator_unittest.cc
@@ -0,0 +1,296 @@
+// Copyright (C) 2010-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <perfdhcp/random_number_generator.h>
+
+#include <gtest/gtest.h>
+#include <boost/shared_ptr.hpp>
+
+#include <iostream>
+
+using namespace isc;
+using namespace isc::perfdhcp;
+using namespace std;
+
+/// \brief Test Fixture Class for uniform random number generator
+///
+/// The hard part for this test is how to test that the number is random?
+/// and how to test that the number is uniformly distributed?
+/// Or maybe we can trust the boost implementation
+class UniformRandomIntegerGeneratorTest : public ::testing::Test {
+public:
+    UniformRandomIntegerGeneratorTest():
+        gen_(min_, max_)
+    {
+    }
+    virtual ~UniformRandomIntegerGeneratorTest(){}
+
+    int gen() { return (gen_()); }
+    int max() const { return (max_); }
+    int min() const { return (min_); }
+
+private:
+    UniformRandomIntegerGenerator gen_;
+
+    const static int min_ = 1;
+    const static int max_ = 10;
+};
+
+// Some validation tests will incur performance penalty, so the tests are
+// made only in "debug" version with assert(). But if NDEBUG is defined
+// the tests will be failed since assert() is non-op in non-debug version.
+// The "#ifndef NDEBUG" is added to make the tests be performed only in
+// non-debug environment.
+// Note: the death test is not supported by all platforms.  We need to
+// compile tests using it selectively.
+#if !defined(NDEBUG)
+// Test of the constructor
+TEST_F(UniformRandomIntegerGeneratorTest, Constructor) {
+    // The range must be min<=max
+    ASSERT_THROW(UniformRandomIntegerGenerator(3, 2), InvalidLimits);
+}
+#endif
+
+// Test of the generated integers are in the range [min, max]
+TEST_F(UniformRandomIntegerGeneratorTest, IntegerRange) {
+    vector<int> numbers;
+
+    // Generate a lot of random integers
+    for (int i = 0; i < max()*10; ++i) {
+        numbers.push_back(gen());
+    }
+
+    // Remove the duplicated values
+    sort(numbers.begin(), numbers.end());
+    vector<int>::iterator it = unique(numbers.begin(), numbers.end());
+
+    // make sure the numbers are in range [min, max]
+    ASSERT_EQ(it - numbers.begin(), max() - min() + 1);
+}
+
+/// \brief Test Fixture Class for weighted random number generator
+class WeightedRandomIntegerGeneratorTest : public ::testing::Test {
+public:
+    WeightedRandomIntegerGeneratorTest()
+    { }
+
+    virtual ~WeightedRandomIntegerGeneratorTest()
+    { }
+};
+
+// Test of the weighted random number generator constructor
+TEST_F(WeightedRandomIntegerGeneratorTest, Constructor) {
+    vector<double> probabilities;
+
+    // If no probabilities is provided, the smallest integer will always
+    // be generated
+    WeightedRandomIntegerGenerator gen(probabilities, 123);
+    for (int i = 0; i < 100; ++i) {
+        ASSERT_EQ(gen(), 123);
+    }
+
+/// Some validation tests will incur performance penalty, so the tests are
+/// made only in "debug" version with assert(). But if NDEBUG is defined
+/// the tests will be failed since assert() is non-op in non-debug version.
+/// The "#ifndef NDEBUG" is added to make the tests be performed only in
+/// non-debug environment.
+#if !defined(NDEBUG)
+    //The probability must be >= 0
+    probabilities.push_back(-0.1);
+    probabilities.push_back(1.1);
+    ASSERT_THROW(WeightedRandomIntegerGenerator gen2(probabilities),
+                 InvalidProbValue);
+
+    //The probability must be <= 1.0
+    probabilities.clear();
+    probabilities.push_back(0.1);
+    probabilities.push_back(1.1);
+    ASSERT_THROW(WeightedRandomIntegerGenerator gen3(probabilities),
+                 InvalidProbValue);
+
+    //The sum must be equal to 1.0
+    probabilities.clear();
+    probabilities.push_back(0.2);
+    probabilities.push_back(0.9);
+    ASSERT_THROW(WeightedRandomIntegerGenerator gen4(probabilities), SumNotOne);
+
+    //The sum must be equal to 1.0
+    probabilities.clear();
+    probabilities.push_back(0.3);
+    probabilities.push_back(0.2);
+    probabilities.push_back(0.1);
+    ASSERT_THROW(WeightedRandomIntegerGenerator gen5(probabilities), SumNotOne);
+#endif
+}
+
+// Test the randomization of the generator
+TEST_F(WeightedRandomIntegerGeneratorTest, WeightedRandomization) {
+    const int repeats = 100000;
+    // We repeat the simulation for N=repeats times
+    // for each probability p, its average is mu = N*p
+    // variance sigma^2 = N * p * (1-p)
+    // sigma = sqrt(N*2/9)
+    // we should make sure that mu - 4sigma < count < mu + 4sigma
+    // which means for 99.99366% of the time this should be true
+    {
+        double p = 0.5;
+        vector<double> probabilities;
+        probabilities.push_back(p);
+        probabilities.push_back(p);
+
+        // Uniformly generated integers
+        WeightedRandomIntegerGenerator gen(probabilities);
+        int c1 = 0;
+        int c2 = 0;
+        for (int i = 0; i < repeats; ++i){
+            int n = gen();
+            if (n == 0) {
+                ++c1;
+            } else if (n == 1) {
+                ++c2;
+            }
+        }
+        double mu = repeats * p;
+        double sigma = sqrt(repeats * p * (1 - p));
+        ASSERT_TRUE(fabs(c1 - mu) < 4*sigma);
+        ASSERT_TRUE(fabs(c2 - mu) < 4*sigma);
+    }
+
+    {
+        vector<double> probabilities;
+        int c1 = 0;
+        int c2 = 0;
+        double p1 = 0.2;
+        double p2 = 0.8;
+        probabilities.push_back(p1);
+        probabilities.push_back(p2);
+        WeightedRandomIntegerGenerator gen(probabilities);
+        for (int i = 0; i < repeats; ++i) {
+            int n = gen();
+            if (n == 0) {
+                ++c1;
+            } else if (n == 1) {
+                ++c2;
+            }
+        }
+        double mu1 = repeats * p1;
+        double mu2 = repeats * p2;
+        double sigma1 = sqrt(repeats * p1 * (1 - p1));
+        double sigma2 = sqrt(repeats * p2 * (1 - p2));
+        ASSERT_TRUE(fabs(c1 - mu1) < 4*sigma1);
+        ASSERT_TRUE(fabs(c2 - mu2) < 4*sigma2);
+    }
+
+    {
+        vector<double> probabilities;
+        int c1 = 0;
+        int c2 = 0;
+        double p1 = 0.8;
+        double p2 = 0.2;
+        probabilities.push_back(p1);
+        probabilities.push_back(p2);
+        WeightedRandomIntegerGenerator gen(probabilities);
+        for (int i = 0; i < repeats; ++i) {
+            int n = gen();
+            if (n == 0) {
+                ++c1;
+            } else if (n == 1) {
+                ++c2;
+            }
+        }
+        double mu1 = repeats * p1;
+        double mu2 = repeats * p2;
+        double sigma1 = sqrt(repeats * p1 * (1 - p1));
+        double sigma2 = sqrt(repeats * p2 * (1 - p2));
+        ASSERT_TRUE(fabs(c1 - mu1) < 4*sigma1);
+        ASSERT_TRUE(fabs(c2 - mu2) < 4*sigma2);
+    }
+
+    {
+        vector<double> probabilities;
+        int c1 = 0;
+        int c2 = 0;
+        int c3 = 0;
+        double p1 = 0.5;
+        double p2 = 0.25;
+        double p3 = 0.25;
+        probabilities.push_back(p1);
+        probabilities.push_back(p2);
+        probabilities.push_back(p3);
+        WeightedRandomIntegerGenerator gen(probabilities);
+        for (int i = 0; i < repeats; ++i){
+            int n = gen();
+            if (n == 0) {
+                ++c1;
+            } else if (n == 1) {
+                ++c2;
+            } else if (n == 2) {
+                ++c3;
+            }
+        }
+        double mu1 = repeats * p1;
+        double mu2 = repeats * p2;
+        double mu3 = repeats * p3;
+        double sigma1 = sqrt(repeats * p1 * (1 - p1));
+        double sigma2 = sqrt(repeats * p2 * (1 - p2));
+        double sigma3 = sqrt(repeats * p3 * (1 - p3));
+        ASSERT_TRUE(fabs(c1 - mu1) < 4*sigma1);
+        ASSERT_TRUE(fabs(c2 - mu2) < 4*sigma2);
+        ASSERT_TRUE(fabs(c3 - mu3) < 4*sigma3);
+    }
+}
+
+// Test the reset function of generator
+TEST_F(WeightedRandomIntegerGeneratorTest, ResetProbabilities) {
+    const int repeats = 100000;
+    vector<double> probabilities;
+    int c1 = 0;
+    int c2 = 0;
+    double p1 = 0.8;
+    double p2 = 0.2;
+    probabilities.push_back(p1);
+    probabilities.push_back(p2);
+    WeightedRandomIntegerGenerator gen(probabilities);
+    for (int i = 0; i < repeats; ++i) {
+        int n = gen();
+        if (n == 0) {
+            ++c1;
+        } else if (n == 1) {
+            ++c2;
+        }
+    }
+    double mu1 = repeats * p1;
+    double mu2 = repeats * p2;
+    double sigma1 = sqrt(repeats * p1 * (1 - p1));
+    double sigma2 = sqrt(repeats * p2 * (1 - p2));
+    ASSERT_TRUE(fabs(c1 - mu1) < 4*sigma1);
+    ASSERT_TRUE(fabs(c2 - mu2) < 4*sigma2);
+
+    // Reset the probabilities
+    probabilities.clear();
+    c1 = c2 = 0;
+    p1 = 0.2;
+    p2 = 0.8;
+    probabilities.push_back(p1);
+    probabilities.push_back(p2);
+    gen.reset(probabilities);
+    for (int i = 0; i < repeats; ++i) {
+        int n = gen();
+        if (n == 0) {
+            ++c1;
+        } else if (n == 1) {
+            ++c2;
+        }
+    }
+    mu1 = repeats * p1;
+    mu2 = repeats * p2;
+    sigma1 = sqrt(repeats * p1 * (1 - p1));
+    sigma2 = sqrt(repeats * p2 * (1 - p2));
+    ASSERT_TRUE(fabs(c1 - mu1) < 4*sigma1);
+    ASSERT_TRUE(fabs(c2 - mu2) < 4*sigma2);
+}
diff --git a/src/bin/perfdhcp/tests/rate_control_unittest.cc b/src/bin/perfdhcp/tests/rate_control_unittest.cc
new file mode 100644
index 0000000..5619fd3
--- /dev/null
+++ b/src/bin/perfdhcp/tests/rate_control_unittest.cc
@@ -0,0 +1,105 @@
+// Copyright (C) 2013-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include "rate_control.h"
+#include <gtest/gtest.h>
+
+
+using namespace isc;
+using namespace isc::perfdhcp;
+
+/// \brief A class which exposes protected methods and members of the
+/// RateControl class (under test).
+class NakedRateControl : public RateControl {
+public:
+
+    /// \brief Default constructor.
+    NakedRateControl()
+        : RateControl() {
+    }
+
+    /// \brief Constructor which sets up the rate.
+    ///
+    /// \param rate A rate at which messages are sent.
+    /// maximal number of messages sent in one chunk.
+    NakedRateControl(const int rate)
+        : RateControl(rate) {
+    }
+
+    using RateControl::currentTime;
+    using RateControl::start_time_;
+};
+
+// Test default constructor.
+TEST(RateControl, constructorDefault) {
+    NakedRateControl rc;
+    EXPECT_EQ(0, rc.getRate());
+}
+
+// Test the constructor which sets the rate.
+TEST(RateControl, constructor) {
+    // Call the constructor and verify that it sets the appropriate
+    // values.
+    NakedRateControl rc1(3);
+    EXPECT_EQ(3, rc1.getRate());
+
+    // Call the constructor again and make sure that different values
+    // will be set correctly.
+    NakedRateControl rc2(5);
+    EXPECT_EQ(5, rc2.getRate());
+}
+
+// Check the rate accessor.
+TEST(RateControl, getRate) {
+    RateControl rc;
+    ASSERT_EQ(0, rc.getRate());
+    rc.setRate(5);
+    ASSERT_EQ(5, rc.getRate());
+    rc.setRate(10);
+    EXPECT_EQ(10, rc.getRate());
+}
+
+// Check that the function returns the number of messages to be sent "now"
+// correctly.
+// @todo Possibly extend this test to cover more complex scenarios. Note that
+// it is quite hard to fully test this function as its behaviour strongly
+// depends on time.
+TEST(RateControl, getOutboundMessageCount) {
+    // Test that the number of outbound messages is correctly defined by the
+    // rate.
+    NakedRateControl rc(2);
+
+    // The first call to getOutboundMessageCount always returns 0 as there is
+    // no good estimate at the beginning how many packets to send.
+    uint64_t count = 0;
+    ASSERT_NO_THROW(count = rc.getOutboundMessageCount());
+    EXPECT_EQ(count, 1);
+
+    // After a given amount of time number of packets to send should
+    // allow to catch up with requested rate, ie for rate 2pks/s after 1500ms
+    // it should send 2 pkts/s * 1.5s = about 2 pkts.
+    // To simulate 1500ms lets get back start time by 1500ms.
+    rc.start_time_ -= boost::posix_time::milliseconds(1500);
+    ASSERT_NO_THROW(count = rc.getOutboundMessageCount());
+    EXPECT_EQ(count, 2);
+
+    // If elapsed time is big then a big number of packets would need to be sent.
+    // But the pkts number is capped to 3. Check it.
+    rc.start_time_ -= boost::posix_time::milliseconds(10000);
+    ASSERT_NO_THROW(count = rc.getOutboundMessageCount());
+    EXPECT_EQ(count, 3);
+}
+
+// Test the rate modifier for valid and invalid rate values.
+TEST(RateControl, setRate) {
+    NakedRateControl rc;
+    EXPECT_NO_THROW(rc.setRate(1));
+    EXPECT_NO_THROW(rc.setRate(0));
+    EXPECT_THROW(rc.setRate(-1), isc::BadValue);
+}
diff --git a/src/bin/perfdhcp/tests/receiver_unittest.cc b/src/bin/perfdhcp/tests/receiver_unittest.cc
new file mode 100644
index 0000000..1a1cb68
--- /dev/null
+++ b/src/bin/perfdhcp/tests/receiver_unittest.cc
@@ -0,0 +1,116 @@
+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "command_options_helper.h"
+
+#include <dhcp/iface_mgr.h>
+
+
+#include <exceptions/exceptions.h>
+#include "receiver.h"
+#include <gtest/gtest.h>
+
+
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+
+/// \brief FakeReceiverPerfSocket class that mocks PerfSocket.
+///
+/// It stubs send and receive operations and collects statistics.
+class FakeReceiverPerfSocket: public BasePerfSocket {
+public:
+    /// \brief Default constructor for FakeReceiverPerfSocket.
+    FakeReceiverPerfSocket() :
+        iface_(boost::make_shared<Iface>("fake", 0)),
+        sent_cnt_(0),
+        recv_cnt_(0) {};
+
+    IfacePtr iface_;  ///< Local fake interface.
+
+    int sent_cnt_;  ///< Counter of sent packets
+    int recv_cnt_;  ///< Counter of received packets.
+
+    /// \brief Simulate receiving DHCPv4 packet.
+    virtual dhcp::Pkt4Ptr receive4(uint32_t timeout_sec, uint32_t timeout_usec) override {
+        (void)timeout_sec; // silence compile 'unused parameter' warning;
+        (void)timeout_usec; // silence compile 'unused parameter' warning;
+        recv_cnt_++;
+        // slow down receiving as receiver calls it in a loop thousands of time
+        // if null is returned
+        usleep(50);
+        return(dhcp::Pkt4Ptr());
+    };
+
+    /// \brief Simulate receiving DHCPv6 packet.
+    virtual dhcp::Pkt6Ptr receive6(uint32_t timeout_sec, uint32_t timeout_usec) override {
+        (void)timeout_sec; // silence compile 'unused parameter' warning;
+        (void)timeout_usec; // silence compile 'unused parameter' warning;
+        recv_cnt_++;
+        return(dhcp::Pkt6Ptr());
+    };
+
+    /// \brief Simulate sending DHCPv4 packet.
+    virtual bool send(const dhcp::Pkt4Ptr& pkt) override {
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        return true;
+    };
+
+    /// \brief Simulate sending DHCPv6 packet.
+    virtual bool send(const dhcp::Pkt6Ptr& pkt) override {
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        return true;
+    };
+
+    /// \brief Override getting interface.
+    virtual IfacePtr getIface() override { return iface_; }
+
+    void reset() {
+        sent_cnt_ = 0;
+        recv_cnt_ = 0;
+    }
+};
+
+
+TEST(Receiver, singleThreaded) {
+    CommandOptions opt;
+    CommandOptionsHelper::process(opt, "perfdhcp -g single -l 127.0.0.1 all");
+    ASSERT_TRUE(opt.isSingleThreaded());
+
+    FakeReceiverPerfSocket socket;
+    Receiver receiver(socket, opt.isSingleThreaded(), opt.getIpVersion());
+
+    ASSERT_NO_THROW(receiver.start());
+
+    auto pkt = receiver.getPkt();
+
+    EXPECT_EQ(pkt, nullptr);
+
+    ASSERT_NO_THROW(receiver.stop());
+}
+
+
+TEST(Receiver, multiThreaded) {
+    CommandOptions opt;
+    CommandOptionsHelper::process(opt, "perfdhcp -g multi -l 127.0.0.1 all");
+    ASSERT_FALSE(opt.isSingleThreaded());
+
+    FakeReceiverPerfSocket socket;
+    Receiver receiver(socket, opt.isSingleThreaded(), opt.getIpVersion());
+
+    ASSERT_NO_THROW(receiver.start());
+
+    auto pkt = receiver.getPkt();
+
+    EXPECT_EQ(pkt, nullptr);
+
+    ASSERT_NO_THROW(receiver.stop());
+}
diff --git a/src/bin/perfdhcp/tests/run_unittests.cc b/src/bin/perfdhcp/tests/run_unittests.cc
new file mode 100644
index 0000000..628f79d
--- /dev/null
+++ b/src/bin/perfdhcp/tests/run_unittests.cc
@@ -0,0 +1,17 @@
+// Copyright (C) 2009-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    return (isc::util::unittests::run_all());
+}
diff --git a/src/bin/perfdhcp/tests/stats_mgr_unittest.cc b/src/bin/perfdhcp/tests/stats_mgr_unittest.cc
new file mode 100644
index 0000000..54253d5
--- /dev/null
+++ b/src/bin/perfdhcp/tests/stats_mgr_unittest.cc
@@ -0,0 +1,598 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "command_options_helper.h"
+
+#include <perfdhcp/stats_mgr.h>
+
+#include <exceptions/exceptions.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+
+#include <gtest/gtest.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+
+using namespace std;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+namespace {
+
+const uint32_t common_transid = 123;
+
+/// @brief Number of packets to be used for testing packets collecting.
+const size_t TEST_COLLECTED_PKT_NUM = 10;
+
+/// @brief DHCPv4 packet with modifiable internal values.
+///
+/// Currently the only additional modifiable value is a packet
+/// timestamp.
+class Pkt4Modifiable : public Pkt4 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param msg_type DHCPv4 message type.
+    /// @param transid Transaction id.
+    Pkt4Modifiable(const uint8_t msg_type, const uint32_t transid)
+        : Pkt4(msg_type, transid) {
+    }
+
+    /// @brief Modifies packet timestamp.
+    ///
+    /// @param delta Number of seconds to be added to the current
+    /// packet time. If this number is negative, the new timestamp
+    /// will point to earlier time than the original timestamp.
+    void modifyTimestamp(const long delta) {
+        timestamp_ += boost::posix_time::seconds(delta);
+    }
+};
+
+/// @brief Pointer to the Pkt4Modifiable.
+typedef boost::shared_ptr<Pkt4Modifiable> Pkt4ModifiablePtr;
+
+class StatsMgrTest : public ::testing::Test {
+public:
+    StatsMgrTest() {
+    }
+
+    /// \brief Create DHCPv4 packet.
+    ///
+    /// Method creates DHCPv4 packet and updates its timestamp.
+    ///
+    /// \param msg_type DHCPv4 message type.
+    /// \param transid transaction id for the packet.
+    /// \return DHCPv4 packet.
+    Pkt4Modifiable* createPacket4(const uint8_t msg_type,
+                                  const uint32_t transid) {
+        Pkt4Modifiable* pkt = new Pkt4Modifiable(msg_type, transid);
+        // Packet timestamp is normally updated by interface
+        // manager on packets reception or send. Unit tests
+        // do not use interface manager so we need to do it
+        // ourselves.
+        pkt->updateTimestamp();
+        return (pkt);
+    }
+
+    /// \brief Create DHCPv6 packet.
+    ///
+    /// Method creates DHCPv6 packet and updates its timestamp.
+    ///
+    /// \param msg_type DHCPv6 message type.
+    /// \param transid transaction id.
+    /// \return DHCPv6 packet.
+    Pkt6* createPacket6(const uint8_t msg_type,
+                        const uint32_t transid) {
+        Pkt6* pkt = new Pkt6(msg_type, transid);
+        // Packet timestamp is normally updated by interface
+        // manager on packets reception or send. Unit tests
+        // do not use interface manager so we need to do it
+        // ourselves.
+        pkt->updateTimestamp();
+        return pkt;
+    }
+
+    /// \brief Pass multiple DHCPv6 packets to Statistics Manager.
+    ///
+    /// Method simulates sending or receiving  multiple DHCPv6 packets.
+    ///
+    /// \note The xchg_type parameter is passed as non-const value to avoid
+    /// false cppcheck errors which expect enum value being passed by reference.
+    /// This error is not reported when non-const enum is passed by value.
+    ///
+    /// \param stats_mgr Statistics Manager instance to be used.
+    /// \param xchg_type packet exchange types.
+    /// \param packet_type DHCPv6 packet type.
+    /// \param num_packets packets to be passed to Statistics Manager.
+    /// \param receive simulated packets are received (if true)
+    /// or sent (if false)
+    void passMultiplePackets6(const boost::shared_ptr<StatsMgr> stats_mgr,
+                              ExchangeType xchg_type,
+                              const uint8_t packet_type,
+                              const int num_packets,
+                              const bool receive = false) {
+        for (int i = 0; i < num_packets; ++i) {
+            boost::shared_ptr<Pkt6>
+                packet(createPacket6(packet_type, i));
+
+            if (receive) {
+                ASSERT_NO_THROW(
+                    stats_mgr->passRcvdPacket(xchg_type, packet);
+                );
+            } else {
+                ASSERT_NO_THROW(
+                    stats_mgr->passSentPacket(xchg_type, packet)
+                );
+            }
+        }
+    }
+
+    /// \brief Simulate DHCPv4 DISCOVER-OFFER with delay.
+    ///
+    /// Method simulates DHCPv4 DISCOVER-OFFER exchange. The OFFER packet
+    /// creation is delayed by the specified number of seconds. This imposes
+    /// different packet timestamps and affects delay counters in Statistics
+    /// Manager.
+    ///
+    /// \param stats_mgr Statistics Manager instance.
+    /// \param delay delay in seconds between DISCOVER and OFFER packets.
+    void passDOPacketsWithDelay(const boost::shared_ptr<StatsMgr> stats_mgr,
+                                unsigned int delay,
+                                uint32_t transid) {
+        boost::shared_ptr<Pkt4> sent_packet(createPacket4(DHCPDISCOVER,
+                                                      transid));
+        ASSERT_NO_THROW(
+            stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+        );
+
+        // Simulate time difference by changing time of sent packet
+        auto ts = sent_packet->getTimestamp() - boost::posix_time::seconds(delay);
+        sent_packet->setTimestamp(ts);
+
+        boost::shared_ptr<Pkt4> rcvd_packet(createPacket4(DHCPOFFER,
+                                                      transid));
+        ASSERT_NO_THROW(
+            stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet);
+        );
+
+        // Calculate period between packets.
+        boost::posix_time::ptime sent_time = sent_packet->getTimestamp();
+        boost::posix_time::ptime rcvd_time = rcvd_packet->getTimestamp();
+
+        ASSERT_FALSE(sent_time.is_not_a_date_time());
+        ASSERT_FALSE(rcvd_time.is_not_a_date_time());
+    }
+
+    /// @brief This test verifies that timed out packets are collected.
+    ///
+    /// @param transid_index Index in the table of transaction ids which
+    /// points to the transaction id to be selected for the DHCPOFFER.
+    void testSendReceiveCollected(const size_t transid_index) {
+        CommandOptions opt;
+        boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+        // The second parameter indicates that transactions older than
+        // 2 seconds should be removed and respective packets collected.
+        stats_mgr->addExchangeStats(ExchangeType::DO, 2);
+
+        // Transaction ids of packets to be sent. All transaction ids
+        // belong to the same bucket (match the transid & 1023 hashing
+        // function).
+        uint32_t transid[TEST_COLLECTED_PKT_NUM] =
+            { 1, 1025, 2049, 3073, 4097, 5121, 6145, 7169, 8193, 9217 };
+
+        // Simulate sending a number of packets.
+        for (unsigned int i = 0; i < TEST_COLLECTED_PKT_NUM; ++i) {
+            Pkt4ModifiablePtr sent_packet(createPacket4(DHCPDISCOVER,
+                                                    transid[i]));
+            // For packets with low indexes we set the timestamps to
+            // 10s in the past. When DHCPOFFER is processed, the
+            // packets with timestamps older than 2s should be collected.
+            if (i < TEST_COLLECTED_PKT_NUM / 2) {
+                sent_packet->modifyTimestamp(-10);
+            }
+            ASSERT_NO_THROW(
+                stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+            )  << "failure for transaction id " << transid[i];
+        }
+
+        // Create a server response for one of the packets sent.
+        Pkt4ModifiablePtr rcvd_packet(createPacket4(DHCPOFFER,
+                                                    transid[transid_index]));
+        ASSERT_NO_THROW(
+            stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet);
+        );
+
+        // There is exactly one case (transaction id) for which perfdhcp
+        // will find a packet using ordered lookup. In this case, no
+        // packets will be collected. Otherwise, for any unordered lookup
+        // all packets from a bucket should be collected.
+        if (stats_mgr->getUnorderedLookups(ExchangeType::DO) > 0) {
+            // All packets in the bucket having transaction id
+            // index below TEST_COLLECTED_PKT_NUM / 2 should be removed.
+            EXPECT_EQ(TEST_COLLECTED_PKT_NUM / 2,
+                      stats_mgr->getCollectedNum(ExchangeType::DO));
+        }
+
+        // Make sure that we can still use the StatsMgr. It is possible
+        // that the pointer to 'next sent' packet was invalidated
+        // during packet removal.
+        for (unsigned int i = 0; i < TEST_COLLECTED_PKT_NUM; ++i) {
+            // Increase transaction ids by 1 so as they don't duplicate
+            // with transaction ids of already sent packets.
+            Pkt4ModifiablePtr sent_packet(createPacket4(DHCPDISCOVER,
+                                                    transid[i] + 1));
+            Pkt4ModifiablePtr rcvd_packet(createPacket4(DHCPOFFER,
+                                                        transid[i] + 1));
+            ASSERT_NO_THROW(
+                stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+            ) << "failure for transaction id " << transid[i];
+
+            ASSERT_NO_THROW(
+                stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet);
+            ) << "failure for transaction id " << transid[i];
+        }
+
+        // We should have processed TEST_COLLECTED_PKT_NUM but it is possible
+        // that one of them we couldn't match (orphan packet), because
+        // the matched packet had to be collected because of the transaction
+        // timeout. Therefore, we have to count both received packets and
+        // orphans.
+        EXPECT_EQ(TEST_COLLECTED_PKT_NUM + 1,
+                  stats_mgr->getRcvdPacketsNum(ExchangeType::DO) +
+                  stats_mgr->getOrphans(ExchangeType::DO));
+    }
+};
+
+TEST_F(StatsMgrTest, Constructor) {
+    CommandOptions opt;
+    boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::DO);
+    EXPECT_DOUBLE_EQ(
+        std::numeric_limits<double>::max(),
+        stats_mgr->getMinDelay(ExchangeType::DO)
+    );
+    EXPECT_DOUBLE_EQ(0, stats_mgr->getMaxDelay(ExchangeType::DO));
+    EXPECT_EQ(0, stats_mgr->getOrphans(ExchangeType::DO));
+    EXPECT_EQ(0, stats_mgr->getOrderedLookups(ExchangeType::DO));
+    EXPECT_EQ(0, stats_mgr->getUnorderedLookups(ExchangeType::DO));
+    EXPECT_EQ(0, stats_mgr->getSentPacketsNum(ExchangeType::DO));
+    EXPECT_EQ(0, stats_mgr->getRcvdPacketsNum(ExchangeType::DO));
+    EXPECT_EQ(0, stats_mgr->getCollectedNum(ExchangeType::DO));
+
+    EXPECT_THROW(stats_mgr->getAvgDelay(ExchangeType::DO), InvalidOperation);
+    EXPECT_THROW(stats_mgr->getStdDevDelay(ExchangeType::DO),
+                 InvalidOperation);
+    EXPECT_THROW(stats_mgr->getAvgUnorderedLookupSetSize(ExchangeType::DO),
+                 InvalidOperation);
+}
+
+TEST_F(StatsMgrTest, Exchange) {
+    CommandOptions opt;
+    boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    boost::shared_ptr<Pkt4> sent_packet(createPacket4(DHCPDISCOVER,
+                                                      common_transid));
+    boost::shared_ptr<Pkt4> rcvd_packet(createPacket4(DHCPOFFER,
+                                                      common_transid));
+    // This is expected to throw because XCHG_DO was not yet
+    // added to Stats Manager for tracking.
+    ASSERT_FALSE(stats_mgr->hasExchangeStats(ExchangeType::DO));
+    ASSERT_FALSE(stats_mgr->hasExchangeStats(ExchangeType::RA));
+    EXPECT_THROW(
+        stats_mgr->passSentPacket(ExchangeType::DO, sent_packet),
+        BadValue
+    );
+    EXPECT_THROW(
+        stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet),
+        BadValue
+    );
+
+
+    // Adding DISCOVER-OFFER exchanges to be tracked by Stats Manager.
+    stats_mgr->addExchangeStats(ExchangeType::DO);
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::DO));
+    ASSERT_FALSE(stats_mgr->hasExchangeStats(ExchangeType::RA));
+    // The following two attempts are expected to throw because
+    // invalid exchange types are passed (XCHG_RA instead of XCHG_DO)
+    EXPECT_THROW(
+        stats_mgr->passSentPacket(ExchangeType::RA, sent_packet),
+        BadValue
+    );
+    EXPECT_THROW(
+        stats_mgr->passRcvdPacket(ExchangeType::RA, rcvd_packet),
+        BadValue
+    );
+
+    // The following two attempts are expected to run fine because
+    // right exchange type is specified.
+    EXPECT_NO_THROW(
+        stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+    );
+    EXPECT_NO_THROW(
+        stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet)
+    );
+}
+
+TEST_F(StatsMgrTest, MultipleExchanges) {
+    CommandOptions opt;
+    boost::shared_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::SA);
+    stats_mgr->addExchangeStats(ExchangeType::RR);
+
+    // Simulate sending number of solicit packets.
+    const int solicit_packets_num = 10;
+    passMultiplePackets6(stats_mgr, ExchangeType::SA, DHCPV6_SOLICIT,
+                         solicit_packets_num);
+
+    // Simulate sending number of request packets. It is important that
+    // number of request packets is different then number of solicit
+    // packets. We can now check if right number packets went to
+    // the right exchange type group.
+    const int request_packets_num = 5;
+    passMultiplePackets6(stats_mgr, ExchangeType::RR, DHCPV6_REQUEST,
+                         request_packets_num);
+
+    // Check if all packets are successfully passed to packet lists.
+    EXPECT_EQ(solicit_packets_num,
+              stats_mgr->getSentPacketsNum(ExchangeType::SA));
+    EXPECT_EQ(request_packets_num,
+              stats_mgr->getSentPacketsNum(ExchangeType::RR));
+
+    // Simulate reception of multiple packets for both SOLICIT-ADVERTISE
+    // and REQUEST-REPLY exchanges. Assume no packet drops.
+    const bool receive_packets = true;
+    passMultiplePackets6(stats_mgr, ExchangeType::SA, DHCPV6_ADVERTISE,
+                         solicit_packets_num, receive_packets);
+
+    passMultiplePackets6(stats_mgr, ExchangeType::RR, DHCPV6_REPLY,
+                         request_packets_num, receive_packets);
+
+    // Verify that all received packets are counted.
+    EXPECT_EQ(solicit_packets_num,
+              stats_mgr->getRcvdPacketsNum(ExchangeType::SA));
+    EXPECT_EQ(request_packets_num,
+              stats_mgr->getRcvdPacketsNum(ExchangeType::RR));
+}
+
+TEST_F(StatsMgrTest, SendReceiveSimple) {
+    CommandOptions opt;
+    boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    boost::shared_ptr<Pkt4> sent_packet(createPacket4(DHCPDISCOVER,
+                                                      common_transid));
+    boost::shared_ptr<Pkt4> rcvd_packet(createPacket4(DHCPOFFER,
+                                                      common_transid));
+    stats_mgr->addExchangeStats(ExchangeType::DO);
+    // The following attempt is expected to pass because the right
+    // exchange type is used.
+    ASSERT_NO_THROW(
+        stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+    );
+    // It is ok, to pass to received packets here. First one will
+    // be matched with sent packet. The latter one will not be
+    // matched with sent packet but orphans counter will simply
+    // increase.
+    ASSERT_NO_THROW(
+        stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet)
+    );
+    ASSERT_NO_THROW(
+        stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet)
+    );
+    EXPECT_EQ(1, stats_mgr->getOrphans(ExchangeType::DO));
+}
+
+TEST_F(StatsMgrTest, SendReceiveUnordered) {
+    CommandOptions opt;
+    const int packets_num = 10;
+    boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::DO);
+
+    // Transaction ids of 10 packets to be sent and received.
+    uint32_t transid[packets_num] =
+        { 1, 1024, 2, 1025, 3, 1026, 4, 1027, 5, 1028 };
+    for (int i = 0; i < packets_num; ++i) {
+        boost::shared_ptr<Pkt4> sent_packet(createPacket4(DHCPDISCOVER,
+                                                          transid[i]));
+        ASSERT_NO_THROW(
+            stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+        );
+    }
+
+    // We are simulating that received packets are coming in reverse order:
+    // 1028, 5, 1027 ....
+    for (int i = 0; i < packets_num; ++i) {
+        boost::shared_ptr<Pkt4>
+            rcvd_packet(createPacket4(DHCPDISCOVER,
+                                      transid[packets_num - 1 - i]));
+        ASSERT_NO_THROW(
+            stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet);
+        );
+    }
+    // All packets are expected to match (we did not drop any)
+    EXPECT_EQ(0, stats_mgr->getOrphans(ExchangeType::DO));
+    // Most of the time we have to do unordered lookups except for the last
+    // one. Packets are removed from the sent list every time we have a match
+    // so eventually we come up with the single packet that caching iterator
+    // is pointing to. This is counted as ordered lookup.
+    EXPECT_EQ(1, stats_mgr->getOrderedLookups(ExchangeType::DO));
+    EXPECT_EQ(9, stats_mgr->getUnorderedLookups(ExchangeType::DO));
+}
+
+TEST_F(StatsMgrTest, SendReceiveCollected) {
+    // Check that the packet collection mechanism works fine
+    // for any packet returned by the server.
+    for (unsigned int i = 0; i < TEST_COLLECTED_PKT_NUM; ++i) {
+        testSendReceiveCollected(i);
+    }
+}
+
+TEST_F(StatsMgrTest, Orphans) {
+    CommandOptions opt;
+    const int packets_num = 6;
+    boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::DO);
+
+    // We skip every second packet to simulate drops.
+    for (int i = 0; i < packets_num; i += 2) {
+        boost::shared_ptr<Pkt4> sent_packet(createPacket4(DHCPDISCOVER, i));
+        ASSERT_NO_THROW(
+            stats_mgr->passSentPacket(ExchangeType::DO, sent_packet)
+        );
+    }
+    // We pass all received packets.
+    for (int i = 0; i < packets_num; ++i) {
+        boost::shared_ptr<Pkt4> rcvd_packet(createPacket4(DHCPOFFER, i));
+        ASSERT_NO_THROW(
+            stats_mgr->passRcvdPacket(ExchangeType::DO, rcvd_packet);
+        );
+    }
+    // The half of received packets are expected not to have matching
+    // sent packet.
+    EXPECT_EQ(packets_num / 2, stats_mgr->getOrphans(ExchangeType::DO));
+}
+
+TEST_F(StatsMgrTest, Delays) {
+    CommandOptions opt;
+    boost::shared_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::DO, 5);
+
+    // Send DISCOVER, wait 2s and receive OFFER. This will affect
+    // counters in Stats Manager.
+    passDOPacketsWithDelay(stats_mgr, 2, common_transid);
+
+    // Initially min delay is equal to MAX_DOUBLE. After first packets
+    // are passed, it is expected to set to actual value.
+    EXPECT_LT(stats_mgr->getMinDelay(ExchangeType::DO),
+              std::numeric_limits<double>::max());
+    EXPECT_GT(stats_mgr->getMinDelay(ExchangeType::DO), 1);
+
+    // Max delay is supposed to the same value as minimum
+    // or maximum delay.
+    EXPECT_GT(stats_mgr->getMaxDelay(ExchangeType::DO), 1);
+
+    // Delay sums are now the same as minimum or maximum delay.
+    EXPECT_GT(stats_mgr->getAvgDelay(ExchangeType::DO), 1);
+
+    // Simulate another DISCOVER-OFFER exchange with delay between
+    // sent and received packets. Delay is now shorter than earlier
+    // so standard deviation of delay will now increase.
+    const unsigned int delay2 = 1;
+    passDOPacketsWithDelay(stats_mgr, delay2, common_transid + 1);
+    // Standard deviation is expected to be non-zero.
+    EXPECT_GT(stats_mgr->getStdDevDelay(ExchangeType::DO), 0);
+}
+
+TEST_F(StatsMgrTest, CustomCounters) {
+    CommandOptions opt;
+    boost::scoped_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+
+    // Specify counter keys and names.
+    const std::string too_short_key("tooshort");
+    const std::string too_short_name("Too short packets");
+    const std::string too_late_key("toolate");
+    const std::string too_late_name("Packets sent too late");
+
+    // Add two custom counters.
+    stats_mgr->addCustomCounter(too_short_key, too_short_name);
+    stats_mgr->addCustomCounter(too_late_key, too_late_name);
+
+    // Increment one of the counters 10 times.
+    const uint64_t tooshort_num = 10;
+    for (uint64_t i = 0; i < tooshort_num; ++i) {
+        stats_mgr->incrementCounter(too_short_key);
+    }
+
+    // Increment another counter by 5 times.
+    const uint64_t toolate_num = 5;
+    for (uint64_t i = 0; i < toolate_num; ++i) {
+        stats_mgr->incrementCounter(too_late_key);
+    }
+
+    // Check counter's current value and name.
+    CustomCounterPtr tooshort_counter =
+        stats_mgr->getCounter(too_short_key);
+    EXPECT_EQ(too_short_name, tooshort_counter->getName());
+    EXPECT_EQ(tooshort_num, tooshort_counter->getValue());
+
+    // Check counter's current value and name.
+    CustomCounterPtr toolate_counter =
+        stats_mgr->getCounter(too_late_key);
+    EXPECT_EQ(too_late_name, toolate_counter->getName());
+    EXPECT_EQ(toolate_num, toolate_counter->getValue());
+
+}
+
+TEST_F(StatsMgrTest, PrintStats) {
+    std::cout << "This unit test is checking statistics printing "
+              << "capabilities. It is expected that some counters "
+              << "will be printed during this test. It may also "
+              << "cause spurious errors." << std::endl;
+    CommandOptions opt;
+    boost::shared_ptr<StatsMgr> stats_mgr(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::SA);
+
+    // Simulate sending and receiving one packet. Otherwise printing
+    // functions will complain about lack of packets.
+    const int packets_num = 1;
+    passMultiplePackets6(stats_mgr, ExchangeType::SA, DHCPV6_SOLICIT,
+                         packets_num);
+    passMultiplePackets6(stats_mgr, ExchangeType::SA, DHCPV6_ADVERTISE,
+                         packets_num, true);
+
+    // This function will print statistics even if packets are not
+    // archived because it relies on counters. There is at least one
+    // exchange needed to count the average delay and std deviation.
+    EXPECT_NO_THROW(stats_mgr->printStats());
+
+    // Printing timestamps is expected to fail because by default we
+    // disable packets archiving mode. Without packets we can't get
+    // timestamps.
+    EXPECT_THROW(stats_mgr->printTimestamps(), isc::InvalidOperation);
+
+    // Now, we create another statistics manager instance and enable timestamp
+    // printing, thus also enabling packets archiving mode.
+    CommandOptionsHelper::process(opt, "perfdhcp -x t 127.0.0.1");
+    stats_mgr.reset(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::SA);
+
+    // Timestamps should now get printed because packets have been preserved.
+    EXPECT_NO_THROW(stats_mgr->printTimestamps());
+
+    // Create another statistics manager instance and enable lease printing for
+    // v4, thus also enabling packets archiving mode.
+    CommandOptionsHelper::process(opt, "perfdhcp -4 -x l 127.0.0.1");
+    stats_mgr.reset(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::RNA);
+    stats_mgr->addExchangeStats(ExchangeType::RLA);
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::DO));
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::RA));
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::RNA));
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::RLA));
+
+    // Leases should now get printed because packets have been preserved.
+    EXPECT_NO_THROW(stats_mgr->printLeases());
+
+    // For v6 this time.
+    CommandOptionsHelper::process(opt, "perfdhcp -6 -x l 127.0.0.1");
+    stats_mgr.reset(new StatsMgr(opt));
+    stats_mgr->addExchangeStats(ExchangeType::RN);
+    stats_mgr->addExchangeStats(ExchangeType::RL);
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::SA));
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::RR));
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::RN));
+    ASSERT_TRUE(stats_mgr->hasExchangeStats(ExchangeType::RL));
+
+    // Leases should now get printed because packets have been preserved.
+    EXPECT_NO_THROW(stats_mgr->printLeases());
+}
+
+}  // namespace
diff --git a/src/bin/perfdhcp/tests/test_control_unittest.cc b/src/bin/perfdhcp/tests/test_control_unittest.cc
new file mode 100644
index 0000000..1838a7b
--- /dev/null
+++ b/src/bin/perfdhcp/tests/test_control_unittest.cc
@@ -0,0 +1,1971 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include "command_options_helper.h"
+#include "../test_control.h"
+
+#include <asiolink/io_address.h>
+#include <exceptions/exceptions.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcp/option_int.h>
+#include <dhcp/option6_iaaddr.h>
+#include <dhcp/option6_iaprefix.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/foreach.hpp>
+#include <boost/format.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <stdint.h>
+#include <string>
+#include <vector>
+#include <fstream>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace boost::posix_time;
+using namespace isc;
+using namespace isc::dhcp;
+using namespace isc::perfdhcp;
+
+/// \brief FakePerfSocket class that mocks PerfSocket.
+///
+/// It stubs send and receive operations and collects statistics.
+class FakeTestControlPerfSocket: public BasePerfSocket {
+public:
+    /// \brief Default constructor for FakePerfSocket.
+    FakeTestControlPerfSocket() :
+        iface_(boost::make_shared<Iface>("fake", 0)),
+        sent_cnt_(0),
+        recv_cnt_(0) {};
+
+    IfacePtr iface_;  ///< Local fake interface.
+
+    int sent_cnt_;  ///< Counter of sent packets
+    int recv_cnt_;  ///< Counter of received packets.
+
+    /// \brief Simulate receiving DHCPv4 packet.
+    virtual dhcp::Pkt4Ptr receive4(uint32_t timeout_sec, uint32_t timeout_usec) override {
+        (void)timeout_sec; // silence compile 'unused parameter' warning;
+        (void)timeout_usec; // silence compile 'unused parameter' warning;
+        recv_cnt_++;
+        return(dhcp::Pkt4Ptr());
+    };
+
+    /// \brief Simulate receiving DHCPv6 packet.
+    virtual dhcp::Pkt6Ptr receive6(uint32_t timeout_sec, uint32_t timeout_usec) override {
+        (void)timeout_sec; // silence compile 'unused parameter' warning;
+        (void)timeout_usec; // silence compile 'unused parameter' warning;
+        recv_cnt_++;
+        return(dhcp::Pkt6Ptr());
+    };
+
+    /// \brief Simulate sending DHCPv4 packet.
+    virtual bool send(const dhcp::Pkt4Ptr& pkt) override {
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        sent_pkts4_.push_back(pkt);
+        return true;
+    };
+
+    /// \brief Simulate sending DHCPv6 packet.
+    virtual bool send(const dhcp::Pkt6Ptr& pkt) override {
+        sent_cnt_++;
+        pkt->updateTimestamp();
+        sent_pkts6_.push_back(pkt);
+        return true;
+    };
+
+    /// \brief Override getting interface.
+    virtual IfacePtr getIface() override { return iface_; }
+
+    void reset() {
+        sent_cnt_ = 0;
+        recv_cnt_ = 0;
+    }
+
+    std::vector<dhcp::Pkt4Ptr> sent_pkts4_; /// output v4 packets are stored here
+    std::vector<dhcp::Pkt6Ptr> sent_pkts6_; /// output v6 packets are stored here
+};
+
+
+/// \brief Test Control class with protected members made public.
+///
+/// This class makes protected TestControl class's members public
+/// to allow unit testing.
+class NakedTestControl: public TestControl {
+public:
+
+    /// \brief Incremental transaction id generator.
+    ///
+    /// This is incremental transaction id generator. It overrides
+    /// the default transaction id generator that generates transaction
+    /// ids using random function. This generator will generate values
+    /// like: 1,2,3 etc.
+    class IncrementalGenerator : public TestControl::NumberGenerator {
+    public:
+        /// \brief Default constructor.
+        IncrementalGenerator() :
+            NumberGenerator(),
+            transid_(0) {
+        }
+
+        /// \brief Generate unique transaction id.
+        ///
+        /// Generate unique transaction ids incrementally:
+        /// 1,2,3,4 etc.
+        ///
+        /// \return generated transaction id.
+        virtual uint32_t generate() {
+            return (++transid_);
+        }
+
+        /// \brief Return next transaction id value.
+        uint32_t getNext() const {
+            return (transid_ + 1);
+        }
+
+    private:
+        uint32_t transid_; ///< Last generated transaction id.
+    };
+
+    /// \brief Pointer to incremental generator.
+    typedef boost::shared_ptr<IncrementalGenerator> IncrementalGeneratorPtr;
+
+    using TestControl::createMessageFromReply;
+    using TestControl::createMessageFromAck;
+    using TestControl::factoryElapsedTime6;
+    using TestControl::factoryGeneric;
+    using TestControl::factoryIana6;
+    using TestControl::factoryOptionRequestOption6;
+    using TestControl::factoryRapidCommit6;
+    using TestControl::factoryRequestList4;
+    using TestControl::generateClientId;
+    using TestControl::generateDuid;
+    using TestControl::generateMacAddress;
+    using TestControl::getTemplateBuffer;
+    using TestControl::initPacketTemplates;
+    using TestControl::processReceivedPacket4;
+    using TestControl::processReceivedPacket6;
+    using TestControl::registerOptionFactories;
+    using TestControl::reset;
+    using TestControl::sendDiscover4;
+    using TestControl::sendRequest4;
+    using TestControl::sendPackets;
+    using TestControl::sendMultipleMessages4;
+    using TestControl::sendMultipleMessages6;
+    using TestControl::sendRequest6;
+    using TestControl::sendSolicit6;
+    using TestControl::setDefaults4;
+    using TestControl::setDefaults6;
+    using TestControl::socket_;
+    using TestControl::last_report_;
+    using TestControl::transid_gen_;
+    using TestControl::macaddr_gen_;
+    using TestControl::first_packet_serverid_;
+    using TestControl::interrupted_;
+    using TestControl::template_packets_v4_;
+    using TestControl::template_packets_v6_;
+    using TestControl::ack_storage_;
+    using TestControl::sendMessageFromAck;
+    using TestControl::options_;
+    using TestControl::stats_mgr_;
+
+    FakeTestControlPerfSocket fake_sock_;
+
+    NakedTestControl(CommandOptions &opt) : TestControl(opt, fake_sock_) {
+        uint32_t clients_num = opt.getClientsNum() == 0 ?
+            1 : opt.getClientsNum();
+        setMacAddrGenerator(NumberGeneratorPtr(new TestControl::SequentialGenerator(clients_num)));
+    };
+};
+
+
+/// \brief Test Fixture Class
+///
+/// This test fixture class is used to perform
+/// unit tests on perfdhcp TestControl class.
+class TestControlTest : public virtual ::testing::Test
+{
+public:
+
+    typedef std::vector<uint8_t> MacAddress;
+    typedef MacAddress::iterator MacAddressIterator;
+
+    typedef std::vector<uint8_t> Duid;
+    typedef Duid::iterator DuidIterator;
+
+    /// \brief Default Constructor
+    TestControlTest() { }
+
+    /// \brief Create packet template file from binary data.
+    ///
+    /// Function creates file containing data from the provided buffer
+    /// in hexadecimal format. The size parameter specifies the maximum
+    /// size of the file. If total number of hexadecimal digits resulting
+    /// from buffer size is greater than maximum file size the file is
+    /// truncated.
+    ///
+    /// \param filename template file to be created.
+    /// \param buffer with binary data to be stored in file.
+    /// \param size target size of the file.
+    /// \param invalid_chars inject invalid chars to the template file.
+    /// \return true if file creation successful.
+    bool createTemplateFile(const std::string& filename,
+                            const std::vector<uint8_t>& buf,
+                            const size_t size,
+                            const bool invalid_chars = false) const {
+        std::ofstream temp_file;
+        temp_file.open(filename.c_str(), ios::out | ios::trunc);
+        if (!temp_file.is_open()) {
+            return (false);
+        }
+        for (size_t i = 0; i < buf.size(); ++i) {
+            int first_digit = buf[i] / 16;
+            int second_digit = buf[i] % 16;
+            // Insert two spaces between two hexadecimal digits.
+            // Spaces are allowed in template files.
+            temp_file << std::string(2, ' ');
+            if (2 * i + 1 < size) {
+                if (!invalid_chars) {
+                    temp_file << std::hex << first_digit << second_digit << std::dec;
+                } else {
+                    temp_file << "XY";
+                }
+            } else if (2 * i < size) {
+                if (!invalid_chars) {
+                    temp_file << std::hex << first_digit;
+                } else {
+                    temp_file << "X";
+                }
+            } else {
+                break;
+            }
+        }
+        temp_file.close();
+        return (true);
+    }
+
+    /// \brief Get full path to a file in testdata directory.
+    ///
+    /// \param filename filename being appended to absolute
+    /// path to testdata directory
+    ///
+    /// \return full path to a file in testdata directory.
+    std::string getFullPath(const std::string& filename) const {
+        std::ostringstream stream;
+        stream << TEST_DATA_DIR << "/" << filename;
+        return (stream.str());
+    }
+
+    /// \brief Match requested options in the buffer with given list.
+    ///
+    /// This method iterates through options provided in the buffer
+    /// and matches them with the options specified with first parameter.
+    /// Options in both vectors may be laid in different order.
+    ///
+    /// \param requested_options reference buffer with options.
+    /// \param buf test buffer with options that will be matched.
+    /// \return number of options from the buffer matched with options
+    /// in the reference buffer.
+    int matchRequestedOptions(const dhcp::OptionBuffer& requested_options,
+                              const dhcp::OptionBuffer& buf) const {
+        size_t matched_num = 0;
+        for (size_t i = 0; i < buf.size(); ++i) {
+            for (size_t j = 0; j < requested_options.size(); ++j) {
+                if (requested_options[j] == buf[i]) {
+                    // Requested option has been found.
+                    ++matched_num;
+                }
+            }
+        }
+        return (matched_num);
+    }
+
+    /// \brief Match requested DHCPv6 options in the buffer with given list.
+    ///
+    /// This method iterates through options provided in the buffer and
+    /// matches them with the options specified with first parameter.
+    /// Options in both vectors ma be laid in different order.
+    ///
+    /// \param requested_options reference buffer with options.
+    /// \param buf test buffer with options that will be matched.
+    /// \return number of options from the buffer matched with options in
+    /// the reference buffer or -1 if error occurred.
+    int matchRequestedOptions6(const dhcp::OptionBuffer& requested_options,
+                               const dhcp::OptionBuffer& buf) const {
+        // Sanity check.
+        if ((requested_options.size() % 2 != 0) ||
+            (buf.size() % 2 != 0)) {
+            return -1;
+        }
+        size_t matched_num = 0;
+        for (size_t i = 0; i < buf.size(); i += 2) {
+            for (size_t j = 0; j < requested_options.size(); j += 2) {
+                uint16_t opt_i = (buf[i + 1] << 8) + (buf[i] & 0xFF);
+                uint16_t opt_j = (requested_options[j + 1] << 8)
+                    + (requested_options[j] & 0xFF);
+                if (opt_i == opt_j) {
+                    // Requested option has been found.
+                    ++matched_num;
+                }
+            }
+        }
+        return (matched_num);
+    }
+
+    /// \brief Calculate the maximum vectors' mismatch position.
+    ///
+    /// This helper function calculates the maximum mismatch position
+    /// between two vectors (two different DUIDs or MAC addresses).
+    /// Calculated position is counted from the end of vectors.
+    /// Calculation is based on number of simulated clients. When number
+    /// of clients is less than 256 different DUIDs or MAC addresses can
+    /// can be coded in such a way that they differ on last vector element.
+    /// If number of clients is between 257 and 65536 they can differ
+    /// on two last positions so the returned value will be 2 and so on.
+    ///
+    /// \param clients_num number of simulated clients
+    /// \return maximum mismatch position
+    int unequalOctetPosition(int clients_num) const {
+        if (!clients_num) {
+            return (0);
+        }
+        clients_num--;
+
+        int cnt = 0;
+        while (clients_num) {
+            clients_num >>= 8;
+            ++cnt;
+        }
+
+        return (cnt);
+    }
+
+    /// \brief Test generation of multiple DUIDs
+    ///
+    /// This method checks the generation of multiple DUIDs. Number
+    /// of iterations depends on the number of simulated clients.
+    /// It is expected that DUID's size is 14 (consists of DUID-LLT
+    /// HW type field, 4 octets of time value and MAC address). The
+    /// MAC address can be randomized depending on the number of
+    /// simulated clients. The DUID-LLT and HW type are expected to
+    /// be constant. The time value has to be properly calculated
+    /// as the number of seconds since DUID time epoch. The parts
+    /// of MAC address has to change if multiple clients are simulated
+    /// and do not change if single client is simulated.
+    void testDuid(CommandOptions &opt) const {
+        int clients_num = opt.getClientsNum();
+        // Initialize Test Control class.
+        NakedTestControl tc(opt);
+        // The old duid will be holding the previously generated DUID.
+        // It will be used to compare against the new one. If we have
+        // multiple clients we want to make sure that duids differ.
+        uint8_t randomized = 0;
+        Duid old_duid(tc.generateDuid(randomized));
+        Duid new_duid(0);
+        // total_dist shows the total difference between generated duid.
+        // It has to be greater than zero if multiple clients are simulated.
+        size_t total_dist = 0;
+        // Number of unique DUIDs.
+        size_t unique_duids = 0;
+        // Holds the position if the octet on which two DUIDS can be different.
+        // If number of clients is 256 or less it is last DUID octet (except for
+        // single client when subsequent DUIDs have to be equal). If number of
+        // clients is between 257 and 65536 the last two octets can differ etc.
+        int unequal_pos = unequalOctetPosition(clients_num);
+        // Keep generated DUIDs in this container.
+        std::list<std::vector<uint8_t> > duids;
+        // Perform number of iterations to generate number of DUIDs.
+        for (int i = 0; i < 10 * clients_num; ++i) {
+            if (new_duid.empty()) {
+                new_duid = old_duid;
+            } else {
+                std::swap(old_duid, new_duid);
+                new_duid = tc.generateDuid(randomized);
+            }
+            // The DUID-LLT is expected to start with DUID_LLT value
+            // of 1 and hardware ethernet type equal to 1 (HWETHER_TYPE).
+            const uint8_t duid_llt_and_hw[4] = { 0x0, 0x1, 0x0, 0x1 };
+            // We assume DUID-LLT length 14. This includes 4 octets of
+            // DUID_LLT value, two octets of hardware type, 4 octets
+            // of time value and 6 octets of variable link layer (MAC)
+            // address.
+            const int duid_llt_size = 14;
+            ASSERT_EQ(duid_llt_size, new_duid.size());
+            // The first four octets do not change.
+            EXPECT_TRUE(std::equal(new_duid.begin(), new_duid.begin() + 4,
+                                   duid_llt_and_hw));
+
+            // As described in RFC 8415: 'the time value is the time
+            // that the DUID is generated represented in seconds
+            // since midnight (UTC), January 1, 2000, modulo 2^32.'
+            uint32_t duid_time = 0;
+            // Pick 4 bytes of the time from generated DUID and put them
+            // in reverse order (in DUID they are stored in network order).
+            for (int j = 4; j < 8; ++j) {
+                duid_time |= new_duid[j] << (j - 4);
+            }
+            // Calculate the duration since epoch time.
+            ptime now = microsec_clock::universal_time();
+            ptime duid_epoch(from_iso_string("20000101T000000"));
+            time_period period(duid_epoch, now);
+
+            // Current time is the same or later than time from the DUID because
+            // DUID had been generated before reference duration was calculated.
+            EXPECT_GE(period.length().total_seconds(), duid_time);
+
+            // Get the mismatch position (counting from the end) of
+            // mismatched octet between previously generated DUID
+            // and current.
+            std::pair<DuidIterator, DuidIterator> mismatch_pos =
+                std::mismatch(old_duid.begin(), old_duid.end(),
+                              new_duid.begin());
+            size_t mismatch_dist =
+                std::distance(mismatch_pos.first, old_duid.end());
+            // For single client total_dist is expected to be 0 because
+            // old_duid and new_duid should always match. If we have
+            // more clients then duids have to differ except the case
+            // if randomization algorithm generates the same values but
+            // this would be an error in randomization algorithm.
+            total_dist += mismatch_dist;
+            // Mismatch may have occurred on the DUID octet position
+            // up to calculated earlier unequal_pos.
+            ASSERT_LE(mismatch_dist, unequal_pos);
+            // unique will inform if tested DUID is unique.
+            bool unique = true;
+            for (std::list<std::vector<uint8_t> >::const_iterator it =
+                     duids.begin();
+                 it != duids.end(); ++it) {
+                // DUIDs should be of the same size if we want to compare them.
+                ASSERT_EQ(new_duid.size(), it->size());
+                // Check if DUID is unique.
+                if (std::equal(new_duid.begin(), new_duid.end(), it->begin())) {
+                    unique = false;
+                }
+            }
+            // Expecting that DUIDs will be unique only when
+            // first clients-num iterations is performed.
+            // After that, DUIDs become non unique.
+            if (unique) {
+                ++unique_duids;
+            }
+            // For number of iterations equal to clients_num,2*clients_num
+            // 3*clients_num ... we have to have number of unique duids
+            // equal to clients_num.
+            if ((i != 0) && (i % clients_num == 0)) {
+                ASSERT_EQ(clients_num, unique_duids);
+            }
+            // Remember generated DUID.
+            duids.push_back(new_duid);
+        }
+        // If we have more than one client at least one mismatch occurred.
+        if (clients_num < 2) {
+            EXPECT_EQ(0, total_dist);
+        }
+    }
+
+    /// \brief Test DHCPv4 exchanges.
+    ///
+    /// Function simulates DHCPv4 exchanges. Function caller specifies
+    /// number of exchanges to be simulated and number of simulated
+    /// responses. When number of responses is lower than number of
+    /// iterations than the difference between them is the number
+    /// of simulated packet drops. This is useful to test if program
+    /// exit conditions are handled properly (maximum number of packet
+    /// drops specified as -D<max-drops> is taken into account).
+    ///
+    /// \param iterations_num number of exchanges to simulate.
+    /// \param receive_num number of received OFFER packets.
+    /// \param tc test control instance
+    void testPkt4Exchange(int iterations_num,
+                          int receive_num,
+                          bool use_templates,
+                          NakedTestControl& tc) const {
+        //int sock_handle = 0;
+
+        // Use templates files to crate packets.
+        if (use_templates) {
+            tc.initPacketTemplates();
+            tc.getTemplateBuffer(0);
+            tc.getTemplateBuffer(1);
+        }
+
+        // Incremental transaction id generator will generate
+        // predictable values of transaction id for each iteration.
+        // This is important because we need to simulate responses
+        // from the server and use the same transaction ids as in
+        // packets sent by client.
+        NakedTestControl::IncrementalGeneratorPtr
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+        for (int i = 0; i < iterations_num; ++i) {
+            // Get next transaction id, without actually using it. The same
+            // id will be used by the TestControl class for DHCPDISCOVER.
+            uint32_t transid = generator->getNext();
+            if (use_templates) {
+                tc.sendDiscover4(tc.getTemplateBuffer(0));
+            } else {
+                tc.sendDiscover4();
+            }
+
+            // Do not simulate responses for packets later
+            // that specified as receive_num. This simulates
+            // packet drops.
+            if (i < receive_num) {
+                boost::shared_ptr<Pkt4> offer_pkt4(createOfferPkt4(transid));
+                tc.processReceivedPacket4(offer_pkt4);
+            }
+        }
+    }
+
+    /// \brief Test DHCPv6 exchanges.
+    ///
+    /// Function simulates DHCPv6 exchanges. Function caller specifies
+    /// number of exchanges to be simulated and number of simulated
+    /// responses. When number of responses is lower than number of
+    /// iterations than the difference between them is the number
+    /// of simulated packet drops. This is useful to test if program
+    /// exit conditions are handled properly (maximum number of packet
+    /// drops specified as -D<max-drops> is taken into account).
+    ///
+    /// \param iterations_num number of exchanges to simulate.
+    /// \param receive_num number of received OFFER packets.
+    /// \param tc test control instance
+    void testPkt6Exchange(int iterations_num,
+                          int receive_num,
+                          bool use_templates,
+                          NakedTestControl& tc) const {
+        //int sock_handle = 0;
+
+        // Use templates files to crate packets.
+        if (use_templates) {
+            tc.initPacketTemplates();
+            tc.getTemplateBuffer(0);
+            tc.getTemplateBuffer(1);
+        }
+
+        // Incremental transaction id generator will generate
+        // predictable values of transaction id for each iteration.
+        // This is important because we need to simulate responses
+        // from the server and use the same transaction ids as in
+        // packets sent by client.
+        TestControl::NumberGeneratorPtr
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+        uint32_t transid = 0;
+        for (int i = 0; i < iterations_num; ++i) {
+            // Do not simulate responses for packets later
+            // that specified as receive_num. This simulates
+            // packet drops.
+            if (use_templates) {
+                tc.sendSolicit6(tc.getTemplateBuffer(0));
+            } else {
+                tc.sendSolicit6();
+            }
+            ++transid;
+            if (i < receive_num) {
+                boost::shared_ptr<Pkt6>
+                    advertise_pkt6(createAdvertisePkt6(tc, transid));
+                // Receive ADVERTISE and send REQUEST.
+                tc.processReceivedPacket6(advertise_pkt6);
+                ++transid;
+            }
+        }
+    }
+
+    /// \brief Test generation of multiple MAC addresses.
+    ///
+    /// This method validates generation of multiple MAC addresses.
+    /// The MAC address can be randomized depending on  the number
+    /// of simulated clients. This test checks if different MAC
+    /// addresses are generated if number of simulated clients is
+    /// greater than 1. It also checks if the same MAC addresses is
+    /// generated if only 1 client is simulated.
+    void testMacAddress(CommandOptions &opt) const {
+        int clients_num = opt.getClientsNum();
+        // The old_mac will be holding the value of previously generated
+        // MAC address. We will be comparing the newly generated one with it
+        // to see if it changes when multiple clients are simulated or if it
+        // does not change when single client is simulated.
+        MacAddress old_mac(opt.getMacTemplate());
+        // Holds the position if the octet on which two MAC addresses can
+        // be different. If number of clients is 256 or less it is last MAC
+        // octet (except for single client when subsequent MAC addresses
+        // have to be equal). If number of clients is between 257 and 65536
+        // the last two octets can differ etc.
+        int unequal_pos = unequalOctetPosition(clients_num);
+        // Number of unique MACs.
+        size_t unique_macs = 0;
+        // Initialize Test Controller.
+        NakedTestControl tc(opt);
+        size_t total_dist = 0;
+        // Keep generated MACs in this container.
+        std::list<std::vector<uint8_t> > macs;
+        // Do many iterations to generate and test MAC address values.
+        for (int i = 0; i < clients_num * 10; ++i) {
+            // Generate new MAC address.
+            uint8_t randomized = 0;
+            MacAddress new_mac(tc.generateMacAddress(randomized));
+            // Get the mismatch position (counting from the end) of
+            // mismatched octet between previously generated MAC address
+            // and current.
+            std::pair<MacAddressIterator, MacAddressIterator> mismatch_pos =
+                std::mismatch(old_mac.begin(), old_mac.end(), new_mac.begin());
+            size_t mismatch_dist =
+                std::distance(mismatch_pos.first, old_mac.end());
+            // For single client total_dist is expected to be 0 because
+            // old_mac and new_mac should always match. If we have
+            // more clients then MAC addresses have to differ except
+            // the case if randomization algorithm generates the same
+            // values but this would be an error in randomization algorithm.
+            total_dist += mismatch_dist;
+            // Mismatch may have occurred on the MAC address's octet position
+            // up to calculated earlier unequal_pos.
+            ASSERT_LE(mismatch_dist, unequal_pos);
+            // unique will inform if tested DUID is unique.
+            bool unique = true;
+            for (std::list<std::vector<uint8_t> >::const_iterator it =
+                     macs.begin();
+                 it != macs.end(); ++it) {
+                // MACs should be of the same size if we want to compare them.
+                ASSERT_EQ(new_mac.size(), it->size());
+                // Check if MAC is unique.
+                if (std::equal(new_mac.begin(), new_mac.end(), it->begin())) {
+                    unique = false;
+                }
+            }
+            // Expecting that MACs will be unique only when
+            // first clients-num iterations is performed.
+            // After that, MACs become non unique.
+            if (unique) {
+                ++unique_macs;
+            }
+            // For number of iterations equal to clients_num,2*clients_num
+            // 3*clients_num ... we have to have number of unique MACs
+            // equal to clients_num.
+            if ((i != 0) && (i % clients_num == 0)) {
+                ASSERT_EQ(clients_num, unique_macs);
+            }
+            // Remember generated MAC.
+            macs.push_back(new_mac);
+
+        }
+        if (clients_num < 2)  {
+            EXPECT_EQ(total_dist, 0);
+        }
+    }
+
+    /// \brief Test sending DHCPv4 renews.
+    ///
+    /// This function simulates acquiring 10 leases from the server. Returned
+    /// DHCPACK messages are cached and used to send renew messages.
+    /// The maximal number of messages which can be sent is equal to the
+    /// number of leases acquired (10). This function also checks that an
+    /// attempt to send more renew messages than the number of leases acquired
+    /// will fail.
+    ///
+    /// \param msg_type A type of the message which is simulated to be sent
+    /// (DHCPREQUEST in renew state or DHCPRELEASE).
+    void testSendRenewRelease4(const uint16_t msg_type) {
+        // Build a command line. Depending on the message type, we will use
+        // -f<renew-rate> or -F<release-rate> parameter.
+        CommandOptions opt;
+        std::ostringstream s;
+        s << "perfdhcp -4 -l fake -r 10 ";
+        s << (msg_type == DHCPREQUEST ? "-f" : "-F");
+        s << " 10 -R 10 -L 10067 -n 10 127.0.0.1";
+        processCmdLine(opt, s.str());
+        // Create a test controller class.
+        NakedTestControl tc(opt);
+        // Set the transaction id generator to sequential to control to
+        // guarantee that transaction ids are predictable.
+        boost::shared_ptr<NakedTestControl::IncrementalGenerator>
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+
+        // Send a number of DHCPDISCOVER messages. Each generated message will
+        // be assigned a different transaction id, starting from 1 to 10.
+        tc.sendPackets(10);
+
+        // Simulate DHCPOFFER responses from the server. Each DHCPOFFER is
+        // assigned a transaction id from the range of 1 to 10, so as they
+        // match the transaction ids from the DHCPDISCOVER messages.
+        for (unsigned i = generator->getNext() - 10;
+             i < generator->getNext(); ++i) {
+            Pkt4Ptr offer(createOfferPkt4(i));
+            // If DHCPOFFER is matched with the DHCPDISCOVER the call below
+            // will trigger a corresponding DHCPREQUEST. They will be assigned
+            // transaction ids from the range from 11 to 20 (the range of
+            // 1 to 10 has been used by DHCPDISCOVER-DHCPOFFER).
+            tc.processReceivedPacket4(offer);
+    }
+
+        // Requests have been sent, so now let's simulate responses from the
+        // server. Generate corresponding DHCPACK messages with the transaction
+        // ids from the range from 11 to 20.
+        for (unsigned i = generator->getNext() - 10;
+             i < generator->getNext(); ++i) {
+            Pkt4Ptr ack(createAckPkt4(i));
+            // Each DHCPACK packet corresponds to the new lease acquired. Since
+            // -f<renew-rate> option has been specified, received Reply
+            // messages are held so as renew messages can be sent for
+            // existing leases.
+            tc.processReceivedPacket4(ack);
+        }
+
+        uint64_t msg_num;
+        // Try to send 5 messages. It should be successful because 10
+        // DHCPREQUEST messages has been received. For each of them we
+        // should be able to send renewal.
+        msg_num = tc.sendMultipleMessages4(msg_type, 5);
+        // Make sure that we have sent 5 messages.
+        EXPECT_EQ(5, msg_num);
+
+        // Try to do it again. We should still have 5 Reply packets for
+        // which renews haven't been sent yet.
+        msg_num = tc.sendMultipleMessages4(msg_type, 5);
+        EXPECT_EQ(5, msg_num);
+
+        // We used all the DHCPACK packets (we sent renew or release for each of
+        // them already). Therefore, no further renew messages should be sent
+        // before we acquire new leases.
+        msg_num = tc.sendMultipleMessages4(msg_type, 5);
+        // Make sure that no message has been sent.
+        EXPECT_EQ(0, msg_num);
+    }
+
+    /// \brief Test that the DHCPREQUEST message is created correctly and
+    /// comprises expected values.
+    ///
+    /// \param msg_type A type of the message to be tested:
+    /// DHCPREQUEST in renew state or DHCPRELEASE.
+    void testCreateRenewRelease4(const uint16_t msg_type) {
+        // This command line specifies that the Release/Renew messages should
+        // be sent with the same rate as the Solicit messages.
+        CommandOptions opt;
+        std::ostringstream s;
+        s << "perfdhcp -4 -l lo -r 10 ";
+        s << (msg_type == DHCPREQUEST ? "-F" : "-f") << " 10";
+        s << " -R 10 -L 10067 -n 10 127.0.0.1";
+        processCmdLine(opt, s.str());
+        // Create a test controller class.
+        NakedTestControl tc(opt);
+        // Set the transaction id generator which will be used by the
+        // createRenew or createRelease function to generate transaction id.
+        boost::shared_ptr<NakedTestControl::IncrementalGenerator>
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+
+        Pkt4Ptr ack = createAckPkt4(1);
+
+        // Create DHCPREQUEST from DHCPACK.
+        Pkt4Ptr msg;
+        msg = tc.createMessageFromAck(msg_type, ack);
+
+        // Make sure that the DHCPACK has been successfully created and that
+        // it holds expected data.
+        ASSERT_TRUE(msg);
+        EXPECT_EQ("127.0.0.1", msg->getCiaddr().toText());
+
+        // HW address.
+        HWAddrPtr hwaddr_ack = ack->getHWAddr();
+        ASSERT_TRUE(hwaddr_ack);
+        HWAddrPtr hwaddr_req = msg->getHWAddr();
+        ASSERT_TRUE(hwaddr_req);
+        EXPECT_TRUE(hwaddr_ack->hwaddr_ == hwaddr_req->hwaddr_);
+
+        // Creating message from null DHCPACK should fail.
+        EXPECT_THROW(tc.createMessageFromAck(msg_type, Pkt4Ptr()), isc::BadValue);
+
+        // Creating message from DHCPACK holding zero yiaddr should fail.
+        asiolink::IOAddress yiaddr = ack->getYiaddr();
+        ack->setYiaddr(asiolink::IOAddress::IPV4_ZERO_ADDRESS());
+        EXPECT_THROW(tc.createMessageFromAck(msg_type, ack), isc::BadValue);
+        ack->setYiaddr(yiaddr);
+    }
+
+    /// \brief Test that the DHCPv6 Release or Renew message is created
+    /// correctly and comprises expected options.
+    ///
+    /// \param msg_type A type of the message to be tested: DHCPV6_RELEASE
+    /// or DHCPV6_RENEW.
+    void testCreateRenewRelease6(const uint16_t msg_type) {
+        // This command line specifies that the Release/Renew messages should
+        // be sent with the same rate as the Solicit messages.
+        CommandOptions opt;
+        std::ostringstream s;
+        s << "perfdhcp -6 -l lo -r 10 ";
+        s << (msg_type == DHCPV6_RELEASE ? "-F" : "-f") << " 10 ";
+        s << "-R 10 -L 10547 -n 10 -e address-and-prefix ::1";
+        processCmdLine(opt, s.str());
+        // Create a test controller class.
+        NakedTestControl tc(opt);
+        // Set the transaction id generator which will be used by the
+        // createRenew or createRelease function to generate transaction id.
+        boost::shared_ptr<NakedTestControl::IncrementalGenerator>
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+
+        // Create a Reply packet. The createRelease or createReply function will
+        // need Reply packet to create a corresponding Release or Reply.
+        Pkt6Ptr reply = createReplyPkt6(tc, 1);
+
+        Pkt6Ptr msg;
+        // Check that the message is created.
+        msg = tc.createMessageFromReply(msg_type, reply);
+
+        ASSERT_TRUE(msg);
+        // Check that the message type and transaction id is correct.
+        EXPECT_EQ(msg_type, msg->getType());
+        EXPECT_EQ(1, msg->getTransid());
+
+        // Check that the message has expected options. These are the same for
+        // Release and Renew.
+
+        // Client Identifier.
+        OptionPtr opt_clientid = msg->getOption(D6O_CLIENTID);
+        ASSERT_TRUE(opt_clientid);
+        EXPECT_TRUE(reply->getOption(D6O_CLIENTID)->getData() ==
+                    opt_clientid->getData());
+
+        // Server identifier
+        OptionPtr opt_serverid = msg->getOption(D6O_SERVERID);
+        ASSERT_TRUE(opt_serverid);
+        EXPECT_TRUE(reply->getOption(D6O_SERVERID)->getData() ==
+                opt_serverid->getData());
+
+        // IA_NA
+        OptionPtr opt_ia_na = msg->getOption(D6O_IA_NA);
+        ASSERT_TRUE(opt_ia_na);
+        EXPECT_TRUE(reply->getOption(D6O_IA_NA)->getData() ==
+                    opt_ia_na->getData());
+
+        // IA_PD
+        OptionPtr opt_ia_pd = msg->getOption(D6O_IA_PD);
+        ASSERT_TRUE(opt_ia_pd);
+        EXPECT_TRUE(reply->getOption(D6O_IA_PD)->getData() ==
+                    opt_ia_pd->getData());
+
+        // Make sure that exception is thrown if the Reply message is NULL.
+        EXPECT_THROW(tc.createMessageFromReply(msg_type, Pkt6Ptr()),
+                     isc::BadValue);
+
+    }
+
+    /// \brief Test sending DHCPv6 Releases or Renews.
+    ///
+    /// This function simulates acquiring 10 leases from the server. Returned
+    /// Reply messages are cached and used to send Renew or Release messages.
+    /// The maximal number of Renew or Release messages which can be sent is
+    /// equal to the number of leases acquired (10). This function also checks
+    /// that an attempt to send more Renew or Release messages than the number
+    /// of leases acquired will fail.
+    ///
+    /// \param msg_type A type of the message which is simulated to be sent
+    /// (DHCPV6_RENEW or DHCPV6_RELEASE).
+    void testSendRenewRelease6(const uint16_t msg_type) {
+        // Build a command line. Depending on the message type, we will use
+        // -f<renew-rate> or -F<release-rate> parameter.
+        CommandOptions opt;
+        std::ostringstream s;
+        s << "perfdhcp -6 -l fake -r 10 ";
+        s << (msg_type == DHCPV6_RENEW ? "-f" : "-F");
+        s << " 10 -R 10 -L 10547 -n 10 ::1";
+        processCmdLine(opt, s.str());
+        // Create a test controller class.
+        NakedTestControl tc(opt);
+        // Set the transaction id generator to sequential to control to
+        // guarantee that transaction ids are predictable.
+        boost::shared_ptr<NakedTestControl::IncrementalGenerator>
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+
+        // Send a number of Solicit messages. Each generated Solicit will be
+        // assigned a different transaction id, starting from 1 to 10.
+        tc.sendPackets(10);
+
+        // Simulate Advertise responses from the server. Each advertise is
+        // assigned a transaction id from the range of 1 to 10, so as they
+        // match the transaction ids from the Solicit messages.
+        for (unsigned i = generator->getNext() - 10;
+             i < generator->getNext(); ++i) {
+            Pkt6Ptr advertise(createAdvertisePkt6(tc, i));
+            // If Advertise is matched with the Solicit the call below will
+            // trigger a corresponding Request. They will be assigned
+            // transaction ids from the range from 11 to 20 (the range of
+            // 1 to 10 has been used by Solicit-Advertise).
+            tc.processReceivedPacket6(advertise);
+        }
+
+        // Requests have been sent, so now let's simulate responses from the
+        // server. Generate corresponding Reply messages with the transaction
+        // ids from the range from 11 to 20.
+        for (unsigned i = generator->getNext() - 10;
+             i < generator->getNext(); ++i) {
+            Pkt6Ptr reply(createReplyPkt6(tc, i));
+            // Each Reply packet corresponds to the new lease acquired. Since
+            // -f<renew-rate> option has been specified, received Reply
+            // messages are held so as Renew messages can be sent for
+            // existing leases.
+            tc.processReceivedPacket6(reply);
+        }
+
+        uint64_t msg_num;
+        // Try to send 5 messages. It should be successful because 10 Reply
+        // messages has been received. For each of them we should be able to
+        // send Renew or Release.
+        msg_num = tc.sendMultipleMessages6(msg_type, 5);
+        // Make sure that we have sent 5 messages.
+        EXPECT_EQ(5, msg_num);
+
+        // Try to do it again. We should still have 5 Reply packets for
+        // which Renews or Releases haven't been sent yet.
+        msg_num = tc.sendMultipleMessages6(msg_type, 5);
+        EXPECT_EQ(5, msg_num);
+
+        // We used all the Reply packets (we sent Renew or Release for each of
+        // them already). Therefore, no further Renew or Release messages should
+        // be sent before we acquire new leases.
+        msg_num = tc.sendMultipleMessages6(msg_type, 5);
+        // Make sure that no message has been sent.
+        EXPECT_EQ(0, msg_num);
+
+    }
+
+    /// \brief Test counting rejected leases in Solicit-Advertise.
+    ///
+    /// This function simulates acquiring 4 leases from the server and
+    /// rejecting allocating of 6 leases
+
+    void testCountRejectedLeasesSolAdv() {
+        // Build a command line.
+        CommandOptions opt;
+        std::ostringstream s;
+        s << "perfdhcp -6 -l fake -r 10 -R 10 -L 10547 -n 10 ::1";
+        processCmdLine(opt, s.str());
+        // Create a test controller class.
+        NakedTestControl tc(opt);
+        // Set the transaction id generator to sequential to control to
+        // guarantee that transaction ids are predictable.
+        boost::shared_ptr<NakedTestControl::IncrementalGenerator>
+            generator(new NakedTestControl::IncrementalGenerator());
+        tc.setTransidGenerator(generator);
+
+        // Send a number of Solicit messages. Each generated Solicit will be
+        // assigned a different transaction id, starting from 1 to 10.
+        tc.sendPackets(10);
+
+        // Simulate Advertise responses from the server. Each advertise is
+        // assigned a transaction id from the range of 1 to 6 with incorrect IA
+        // included in the message
+        for (uint32_t i = generator->getNext() - 10; i < 7; ++i) {
+            Pkt6Ptr advertise(createAdvertisePkt6(tc, i, false));
+            tc.processReceivedPacket6(advertise);
+        }
+        // counter of rejected leases has to be 6
+        EXPECT_EQ(tc.stats_mgr_.getRejLeasesNum(ExchangeType::SA), 6);
+        // Simulate Advertise responses from the server. Each advertise is
+        // assigned a transaction id from the range of 7 to 10 with correct IA
+        // included in the message
+        for (uint32_t i = generator->getNext() - 7; i < 11; ++i) {
+            Pkt6Ptr advertise(createAdvertisePkt6(tc, i));
+            tc.processReceivedPacket6(advertise);
+        }
+        // counter of rejected leases can't change at this point
+        EXPECT_EQ(tc.stats_mgr_.getRejLeasesNum(ExchangeType::SA), 6);
+    }
+
+    /// \brief Parse command line string with CommandOptions.
+    ///
+    /// \param cmdline command line string to be parsed.
+    /// \throw isc::Unexpected if unexpected error occurred.
+    /// \throw isc::InvalidParameter if command line is invalid.
+    void processCmdLine(CommandOptions &opt, const std::string& cmdline) const {
+        CommandOptionsHelper::process(opt, cmdline);
+    }
+
+    /// \brief Create DHCPOFFER or DHCPACK packet.
+    ///
+    /// \param pkt_type DHCPOFFER or DHCPACK.
+    /// \param transid Transaction id.
+    ///
+    /// \return Instance of the packet.
+    Pkt4Ptr
+    createResponsePkt4(const uint8_t pkt_type,
+                       const uint32_t transid) const {
+        Pkt4Ptr pkt(new Pkt4(pkt_type, transid));
+        OptionPtr opt_serverid = Option::factory(Option::V4,
+                                                 DHO_DHCP_SERVER_IDENTIFIER,
+                                                 OptionBuffer(4, 1));
+        pkt->setYiaddr(asiolink::IOAddress("127.0.0.1"));
+        pkt->addOption(opt_serverid);
+        pkt->updateTimestamp();
+        return (pkt);
+    }
+
+    /// \brief Create DHCPv4 OFFER packet.
+    ///
+    /// \param transid transaction id.
+    /// \return instance of the packet.
+    Pkt4Ptr
+    createOfferPkt4(uint32_t transid) const {
+        return (createResponsePkt4(DHCPOFFER, transid));
+    }
+
+    /// \brief Create DHCPACK packet.
+    ///
+    /// \param transid transaction id.
+    /// \return instance of the packet.
+    Pkt4Ptr
+    createAckPkt4(const uint32_t transid) const {
+        return (createResponsePkt4(DHCPACK, transid));
+    }
+
+    /// \brief Create DHCPv6 ADVERTISE packet.
+    ///
+    /// \param transid transaction id.
+    /// \return instance of the packet.
+    Pkt6Ptr
+    createAdvertisePkt6(NakedTestControl &tc, const uint32_t transid,
+                        const bool validIA = true) const {
+        boost::shared_ptr<Pkt6> advertise(new Pkt6(DHCPV6_ADVERTISE, transid));
+        // Add IA_NA if requested by the client.
+        if (tc.options_.getLeaseType().includes(CommandOptions::LeaseType::ADDRESS)) {
+            OptionPtr opt_ia_na = Option::factory(Option::V6, D6O_IA_NA);
+            if (validIA) {
+                OptionPtr iaaddr(new Option6IAAddr(D6O_IAADDR,
+                                 isc::asiolink::IOAddress("fe80::abcd"), 300, 500));
+                opt_ia_na->addOption(iaaddr);
+            }
+            advertise->addOption(opt_ia_na);
+        }
+        // Add IA_PD if requested by the client.
+        if (tc.options_.getLeaseType().includes(CommandOptions::LeaseType::PREFIX)) {
+            OptionPtr opt_ia_pd = Option::factory(Option::V6, D6O_IA_PD);
+            if (validIA) {
+                OptionPtr iapref(new Option6IAPrefix(D6O_IAPREFIX,
+                                 isc::asiolink::IOAddress("fe80::"), 64, 300, 500));
+                opt_ia_pd->addOption(iapref);
+            }
+            advertise->addOption(opt_ia_pd);
+        }
+        OptionPtr opt_serverid(new Option(Option::V6, D6O_SERVERID));
+        uint8_t randomized = 0;
+        std::vector<uint8_t> duid(tc.generateDuid(randomized));
+        OptionPtr opt_clientid(Option::factory(Option::V6, D6O_CLIENTID, duid));
+        advertise->addOption(opt_serverid);
+        advertise->addOption(opt_clientid);
+        advertise->updateTimestamp();
+        return (advertise);
+    }
+
+    Pkt6Ptr
+    createReplyPkt6(NakedTestControl &tc, const uint32_t transid,
+                    const bool validIA = true) const {
+        Pkt6Ptr reply(new Pkt6(DHCPV6_REPLY, transid));
+        // Add IA_NA if requested by the client.
+        if (tc.options_.getLeaseType().includes(CommandOptions::LeaseType::ADDRESS)) {
+            OptionPtr opt_ia_na = Option::factory(Option::V6, D6O_IA_NA);
+            if (validIA) {
+                OptionPtr iaaddr(new Option6IAAddr(D6O_IAADDR,
+                                 isc::asiolink::IOAddress("fe80::abcd"), 300, 500));
+                opt_ia_na->addOption(iaaddr);
+            }
+            reply->addOption(opt_ia_na);
+        }
+        // Add IA_PD if requested by the client.
+        if (tc.options_.getLeaseType().includes(CommandOptions::LeaseType::PREFIX)) {
+            OptionPtr opt_ia_pd = Option::factory(Option::V6, D6O_IA_PD);
+            if (validIA) {
+                OptionPtr iapref(new Option6IAPrefix(D6O_IAPREFIX,
+                                 isc::asiolink::IOAddress("fe80::"), 64, 300, 500));
+                opt_ia_pd->addOption(iapref);
+            }
+            reply->addOption(opt_ia_pd);
+        }
+        OptionPtr opt_serverid(new Option(Option::V6, D6O_SERVERID));
+        uint8_t randomized = 0;
+        std::vector<uint8_t> duid(tc.generateDuid(randomized));
+        OptionPtr opt_clientid(Option::factory(Option::V6, D6O_CLIENTID, duid));
+        reply->addOption(opt_serverid);
+        reply->addOption(opt_clientid);
+        reply->updateTimestamp();
+        return (reply);
+
+    }
+
+    /// @brief Check presence and content of v4 options 55.
+    ///
+    /// \param pkt packet to be checked
+    /// \param expected_option_requests only these option requests should be
+    ///     found under option 55 in the packet, nothing more, nothing less
+    void checkOptions55(Pkt4Ptr const& pkt,
+                        vector<uint8_t> const& expected_option_requests) {
+        // Sanity checks
+        ASSERT_TRUE(pkt);
+        OptionPtr const& opt(pkt->getOption(55));
+        ASSERT_TRUE(opt);
+        EXPECT_TRUE(opt->getUniverse() == Option::V4);
+
+        // Create the text of the expected option.
+        string const length(to_string(expected_option_requests.size()));
+        string const buffer(
+            TestControl::vector2Hex(expected_option_requests, ":"));
+        string const expected_option_text(boost::str(
+            boost::format("type=055, len=%03u: %s") % length % buffer));
+
+        // Compare.
+        EXPECT_EQ(opt->toText(), expected_option_text);
+    }
+
+    /// @brief check if v4 options 200 and 201 are present.
+    ///
+    /// The options are expected to have specific format, as if parameters
+    /// -o 200,abcdef1234, -o 201,00 were passed to the command line.
+    void checkOptions20x(const Pkt4Ptr& pkt) {
+        ASSERT_TRUE(pkt);
+        OptionPtr opt = pkt->getOption(200);
+        ASSERT_TRUE(opt);
+        EXPECT_TRUE(opt->getUniverse() == Option::V4);
+        EXPECT_EQ(opt->toText(), "type=200, len=005: ab:cd:ef:12:34");
+
+        opt = pkt->getOption(201);
+        ASSERT_TRUE(opt);
+        EXPECT_EQ(opt->toText(), "type=201, len=001: 00");
+    }
+
+    /// @brief check if v6 options 200 and 201 are present.
+    ///
+    /// The options are expected to have specific format, as if parameters
+    /// -o 200,abcdef1234, -o 201,00 were passed to the command line.
+    void checkOptions20x(const Pkt6Ptr& pkt) {
+        ASSERT_TRUE(pkt);
+        OptionPtr opt = pkt->getOption(200);
+        ASSERT_TRUE(opt);
+        EXPECT_TRUE(opt->getUniverse() == Option::V6);
+        EXPECT_EQ(opt->toText(), "type=00200, len=00005: ab:cd:ef:12:34");
+
+        opt = pkt->getOption(201);
+        ASSERT_TRUE(opt);
+        EXPECT_EQ(opt->toText(), "type=00201, len=00001: 00");
+    }
+
+};
+
+// This test verifies that the class members are reset to expected values.
+TEST_F(TestControlTest, reset) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -4 127.0.0.1");
+    NakedTestControl tc(opt);
+    tc.reset();
+    EXPECT_FALSE(tc.last_report_.is_not_a_date_time());
+    EXPECT_FALSE(tc.transid_gen_);
+    EXPECT_FALSE(tc.macaddr_gen_);
+    EXPECT_TRUE(tc.first_packet_serverid_.empty());
+    EXPECT_FALSE(tc.interrupted_);
+
+}
+
+// This test verifies that the client id is generated from the HW address.
+TEST_F(TestControlTest, generateClientId) {
+    // Generate HW address.
+    std::vector<uint8_t> hwaddr;
+    for (unsigned int i = 0; i < 6; ++i) {
+        hwaddr.push_back(i);
+    }
+    HWAddrPtr hwaddr_ptr(new HWAddr(hwaddr, 5));
+
+    // Use generated HW address to generate client id.
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -4 127.0.0.1");
+    NakedTestControl tc(opt);
+    OptionPtr opt_client_id;
+    opt_client_id = tc.generateClientId(hwaddr_ptr);
+    ASSERT_TRUE(opt_client_id);
+
+    // Extract the client id data.
+    const OptionBuffer& client_id = opt_client_id->getData();
+    ASSERT_EQ(7, client_id.size());
+
+    // Verify that the client identifier is generated correctly.
+
+    // First byte is the HW type.
+    EXPECT_EQ(5, client_id[0]);
+    // The rest of the client identifier should be equal to the HW address.
+    std::vector<uint8_t> sub(client_id.begin() + 1, client_id.end());
+    EXPECT_TRUE(hwaddr == sub);
+}
+
+TEST_F(TestControlTest, GenerateDuid) {
+    // Simple command line that simulates one client only. Always the
+    // same DUID will be generated.
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 all");
+    testDuid(opt);
+
+    // Simulate 50 clients. Different DUID will be generated.
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 -R 50 all");
+    testDuid(opt);
+
+    // Checks that the random mac address returned by generateDuid
+    // is in the list of mac addresses in the mac-list.txt data file
+    std::string mac_list_full_path = getFullPath("mac-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -M " << mac_list_full_path << " 127.0.0.1";
+    processCmdLine(opt, cmd.str());
+    // Initialize Test Controller.
+    NakedTestControl tc(opt);
+    uint8_t randomized = 0;
+    std::vector<uint8_t> generated_duid = tc.generateDuid(randomized);
+
+    // Check that generated_duid is DUID_LL
+    ASSERT_EQ(10, generated_duid.size());
+    DuidPtr duid(new DUID(generated_duid));
+    ASSERT_EQ(duid->getType(), DUID::DUID_LL);
+
+    // Make sure it's on the list
+    const CommandOptions::MacAddrsVector& macs = opt.getMacsFromFile();
+    // DUID LL comprises 2 bytes of duid type, 2 bytes of hardware type,
+    // then 6 bytes of HW address.
+    vector<uint8_t> mac(6);
+    std::copy(generated_duid.begin() + 4, generated_duid.begin() + 10,
+              mac.begin());
+    // Check that mac is in macs.
+    ASSERT_TRUE(std::find(macs.begin(), macs.end(), mac) != macs.end());
+}
+
+TEST_F(TestControlTest, GenerateMacAddress) {
+    CommandOptions opt;
+    // Simulate one client only. Always the same MAC address will be
+    // generated.
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 all");
+    testMacAddress(opt);
+
+    // Simulate 50 clients. Different MAC addresses will be generated.
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 -R 50 all");
+    testMacAddress(opt);
+
+    // Checks that the random mac address returned by generateMacAddress
+    // is in the list of mac addresses in the mac-list.txt data file
+    std::string mac_list_full_path = getFullPath("mac-list.txt");
+    std::ostringstream cmd;
+    cmd << "perfdhcp -M " << mac_list_full_path << " 127.0.0.1";
+    processCmdLine(opt, cmd.str());
+    // Initialize Test Controller.
+    NakedTestControl tc(opt);
+    uint8_t randomized = 0;
+    // Generate MAC address and sanity check its size.
+    std::vector<uint8_t> mac = tc.generateMacAddress(randomized);
+    ASSERT_EQ(6, mac.size());
+    // Make sure that the generated MAC address belongs to the MAC addresses
+    // read from a file.
+    const CommandOptions::MacAddrsVector& macs = opt.getMacsFromFile();
+    ASSERT_TRUE(std::find(macs.begin(), macs.end(), mac) !=  macs.end());
+}
+
+TEST_F(TestControlTest, Options4) {
+    using namespace isc::dhcp;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -4 127.0.0.1");
+    NakedTestControl tc(opt);
+    // By default the IP version mode is V4 so there is no need to
+    // parse command line to override the IP version. Note that
+    // registerOptionFactories is used for both V4 and V6.
+    tc.registerOptionFactories();
+    // Create option with buffer size equal to 1 and holding DHCPDISCOVER
+    // message type.
+    OptionPtr opt_msg_type(Option::factory(Option::V4, DHO_DHCP_MESSAGE_TYPE,
+                                           OptionBuffer(1, DHCPDISCOVER)));
+    // Validate the option type and universe.
+    EXPECT_EQ(Option::V4, opt_msg_type->getUniverse());
+    EXPECT_EQ(DHO_DHCP_MESSAGE_TYPE, opt_msg_type->getType());
+    // Validate the message type from the option we have now created.
+    uint8_t msg_type = 0;
+    msg_type = opt_msg_type->getUint8();
+    EXPECT_EQ(DHCPDISCOVER, msg_type);
+
+    // Create another option: DHCP_PARAMETER_REQUEST_LIST
+    OptionPtr
+        opt_requested_options(Option::factory(Option::V4,
+                                              DHO_DHCP_PARAMETER_REQUEST_LIST));
+    // Here is a list of options that we are requesting in the
+    // server's response.
+    const uint8_t requested_options[] = {
+        DHO_SUBNET_MASK,
+        DHO_BROADCAST_ADDRESS,
+        DHO_TIME_OFFSET,
+        DHO_ROUTERS,
+        DHO_DOMAIN_NAME,
+        DHO_DOMAIN_NAME_SERVERS,
+        DHO_HOST_NAME
+    };
+
+    OptionBuffer
+        requested_options_ref(requested_options,
+                              requested_options + sizeof(requested_options));
+
+    // Get the option buffer. It should hold the combination of values
+    // listed in requested_options array. However their order can be
+    // different in general so we need to search each value separately.
+    const OptionBuffer& requested_options_buf =
+        opt_requested_options->getData();
+    EXPECT_EQ(requested_options_ref.size(), requested_options_buf.size());
+    size_t matched_num = matchRequestedOptions(requested_options_ref,
+                                               requested_options_buf);
+    // We want exactly the same requested options as listed in
+    // requested_options array - nothing more or less.
+    EXPECT_EQ(requested_options_ref.size(), matched_num);
+}
+
+TEST_F(TestControlTest, Options6) {
+    using namespace isc::dhcp;
+    CommandOptions opt;
+
+    // Lets override the IP version to test V6 options (-6 parameter)
+    processCmdLine(opt, "perfdhcp -l lo -6 ::1");
+
+    NakedTestControl tc(opt);
+    tc.registerOptionFactories();
+
+    // Validate the D6O_ELAPSED_TIME option.
+    OptionPtr opt_elapsed_time(Option::factory(Option::V6, D6O_ELAPSED_TIME));
+    // Validate the option type and universe.
+    EXPECT_EQ(Option::V6, opt_elapsed_time->getUniverse());
+    EXPECT_EQ(D6O_ELAPSED_TIME, opt_elapsed_time->getType());
+    // The default value of elapsed time is zero.
+    uint16_t elapsed_time;
+    elapsed_time = opt_elapsed_time->getUint16();
+    EXPECT_EQ(0, elapsed_time);
+
+    // With the factory function we may also specify the actual
+    // value of elapsed time. Let's make use of std::vector
+    // constructor to create the option buffer, 2 octets long
+    // with each octet initialized to 0x1.
+    size_t elapsed_time_buf_size = 2;
+    uint8_t elapsed_time_pattern = 0x1;
+    OptionPtr
+        opt_elapsed_time2(Option::factory(Option::V6, D6O_ELAPSED_TIME,
+                                          OptionBuffer(elapsed_time_buf_size,
+                                                       elapsed_time_pattern)));
+
+    // Any buffer that has size neither equal to 0 nor 2 is considered invalid.
+    elapsed_time_buf_size = 1;
+    EXPECT_THROW(
+        Option::factory(Option::V6, D6O_ELAPSED_TIME,
+                        OptionBuffer(elapsed_time_buf_size, elapsed_time_pattern)),
+        isc::BadValue
+    );
+
+    // Validate the option type and universe.
+    EXPECT_EQ(Option::V6, opt_elapsed_time2->getUniverse());
+    EXPECT_EQ(D6O_ELAPSED_TIME, opt_elapsed_time2->getType());
+    // Make sure the getUint16 does not throw exception. It wile throw
+    // buffer is shorter than 2 octets.
+    elapsed_time = opt_elapsed_time2->getUint16();
+    // Check the expected value of elapsed time.
+    EXPECT_EQ(0x0101, elapsed_time);
+
+    // Validate the D6O_RAPID_COMMIT option.
+    OptionPtr opt_rapid_commit(Option::factory(Option::V6, D6O_RAPID_COMMIT));
+    // Validate the option type and universe.
+    EXPECT_EQ(Option::V6, opt_rapid_commit->getUniverse());
+    EXPECT_EQ(D6O_RAPID_COMMIT, opt_rapid_commit->getType());
+    // Rapid commit has no data payload.
+    EXPECT_THROW(opt_rapid_commit->getUint8(), isc::OutOfRange);
+
+    // Validate the D6O_CLIENTID option.
+    OptionBuffer duid(opt.getDuidTemplate());
+    OptionPtr opt_clientid(Option::factory(Option::V6, D6O_CLIENTID, duid));
+    EXPECT_EQ(Option::V6, opt_clientid->getUniverse());
+    EXPECT_EQ(D6O_CLIENTID, opt_clientid->getType());
+    const OptionBuffer& duid2 = opt_clientid->getData();
+    ASSERT_EQ(duid.size(), duid2.size());
+    // The Duid we set for option is the same we get.
+    EXPECT_TRUE(std::equal(duid.begin(), duid.end(), duid2.begin()));
+
+    // Validate the D6O_ORO (Option Request Option).
+    OptionPtr opt_oro(Option::factory(Option::V6, D6O_ORO));
+    // Prepare the reference buffer with requested options.
+    const uint8_t requested_options[] = {
+        0, D6O_NAME_SERVERS,
+        0, D6O_DOMAIN_SEARCH
+    };
+    // Each option code in ORO is 2 bytes long. We calculate the number of
+    // requested options by dividing the size of the buffer holding options
+    // by the size of each individual option.
+    int requested_options_num = sizeof(requested_options) / sizeof(uint16_t);
+    OptionBuffer
+        requested_options_ref(requested_options,
+                              requested_options + sizeof(requested_options));
+    // Get the buffer from option.
+    const OptionBuffer& requested_options_buf = opt_oro->getData();
+    // Size of reference buffer and option buffer have to be
+    // the same for comparison.
+    EXPECT_EQ(requested_options_ref.size(), requested_options_buf.size());
+    // Check if all options in the buffer are matched with reference buffer.
+    size_t matched_num = matchRequestedOptions6(requested_options_ref,
+                                                requested_options_buf);
+    EXPECT_EQ(requested_options_num, matched_num);
+
+    // Validate the D6O_IA_NA option.
+    OptionPtr opt_ia_na(Option::factory(Option::V6, D6O_IA_NA));
+    EXPECT_EQ(Option::V6, opt_ia_na->getUniverse());
+    EXPECT_EQ(D6O_IA_NA, opt_ia_na->getType());
+    // Every IA_NA option is expected to start with this sequence.
+    const uint8_t opt_ia_na_array[] = {
+        0, 0, 0, 1,                     // IAID = 1
+        0, 0, 3600 >> 8, 3600 & 0xff,  // T1 = 3600
+        0, 0, 5400 >> 8, 5400 & 0xff,   // T2 = 5400
+    };
+    OptionBuffer opt_ia_na_ref(opt_ia_na_array,
+                               opt_ia_na_array + sizeof(opt_ia_na_array));
+    const OptionBuffer& opt_ia_na_buf = opt_ia_na->getData();
+    ASSERT_EQ(opt_ia_na_buf.size(), opt_ia_na_ref.size());
+    EXPECT_TRUE(std::equal(opt_ia_na_ref.begin(), opt_ia_na_ref.end(),
+                           opt_ia_na_buf.begin()));
+
+    // @todo Add more tests for IA address options.
+}
+
+TEST_F(TestControlTest, Packet4) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -L 10547 all");
+    NakedTestControl tc(opt);
+    uint32_t transid = 123;
+    boost::shared_ptr<Pkt4> pkt4(new Pkt4(DHCPDISCOVER, transid));
+    // Set parameters on outgoing packet.
+    tc.setDefaults4(pkt4);
+    // Validate that packet has been setup correctly.
+    EXPECT_EQ(tc.fake_sock_.iface_->getName(), pkt4->getIface());
+    EXPECT_EQ(tc.fake_sock_.ifindex_, pkt4->getIndex());
+    EXPECT_EQ(DHCP4_CLIENT_PORT, pkt4->getLocalPort());
+    EXPECT_EQ(DHCP4_SERVER_PORT, pkt4->getRemotePort());
+    EXPECT_EQ(1, pkt4->getHops());
+    EXPECT_EQ(asiolink::IOAddress("255.255.255.255"),
+              pkt4->getRemoteAddr());
+    EXPECT_EQ(asiolink::IOAddress(tc.socket_.addr_), pkt4->getLocalAddr());
+    EXPECT_EQ(asiolink::IOAddress(tc.socket_.addr_), pkt4->getGiaddr());
+}
+
+TEST_F(TestControlTest, Packet6) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -6 -l fake -L 10547 servers");
+    NakedTestControl tc(opt);
+    uint32_t transid = 123;
+    boost::shared_ptr<Pkt6> pkt6(new Pkt6(DHCPV6_SOLICIT, transid));
+    // Set packet's parameters.
+    tc.setDefaults6(pkt6);
+    // Validate if parameters have been set correctly.
+    EXPECT_EQ(tc.fake_sock_.iface_->getName(), pkt6->getIface());
+    EXPECT_EQ(tc.socket_.ifindex_, pkt6->getIndex());
+    EXPECT_EQ(DHCP6_CLIENT_PORT, pkt6->getLocalPort());
+    EXPECT_EQ(DHCP6_SERVER_PORT, pkt6->getRemotePort());
+    EXPECT_EQ(tc.socket_.addr_, pkt6->getLocalAddr());
+    EXPECT_EQ(asiolink::IOAddress("FF05::1:3"), pkt6->getRemoteAddr());
+    // Packet must not be relayed.
+    EXPECT_TRUE(pkt6->relay_info_.empty());
+}
+
+TEST_F(TestControlTest, Packet6Relayed) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -6 -l fake -A1 -L 10547 servers");
+    NakedTestControl tc(opt);
+    uint32_t transid = 123;
+    boost::shared_ptr<Pkt6> pkt6(new Pkt6(DHCPV6_SOLICIT, transid));
+    // Set packet's parameters.
+    tc.setDefaults6(pkt6);
+    // Validate if parameters have been set correctly.
+    EXPECT_EQ(tc.fake_sock_.iface_->getName(), pkt6->getIface());
+    EXPECT_EQ(tc.socket_.ifindex_, pkt6->getIndex());
+    EXPECT_EQ(DHCP6_CLIENT_PORT, pkt6->getLocalPort());
+    EXPECT_EQ(DHCP6_SERVER_PORT, pkt6->getRemotePort());
+    EXPECT_EQ(tc.socket_.addr_, pkt6->getLocalAddr());
+    EXPECT_EQ(asiolink::IOAddress("FF05::1:3"), pkt6->getRemoteAddr());
+    // Packet should be relayed.
+    EXPECT_EQ(pkt6->relay_info_.size(), 1);
+    EXPECT_EQ(pkt6->relay_info_[0].hop_count_, 0);
+    EXPECT_EQ(pkt6->relay_info_[0].msg_type_, DHCPV6_RELAY_FORW);
+    EXPECT_EQ(pkt6->relay_info_[0].linkaddr_, tc.socket_.addr_);
+    EXPECT_EQ(pkt6->relay_info_[0].peeraddr_, tc.socket_.addr_);
+}
+
+TEST_F(TestControlTest, Packet6RelayedWithRelayOpts) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -6 -l fake -A1 --or 1:32,00000E10 -L 10547 servers");
+    NakedTestControl tc(opt);
+    uint32_t transid = 123;
+    boost::shared_ptr<Pkt6> pkt6(new Pkt6(DHCPV6_SOLICIT, transid));
+    // Set packet's parameters.
+    tc.setDefaults6(pkt6);
+    // Validate if parameters have been set correctly.
+    EXPECT_EQ(tc.fake_sock_.iface_->getName(), pkt6->getIface());
+    EXPECT_EQ(tc.socket_.ifindex_, pkt6->getIndex());
+    EXPECT_EQ(DHCP6_CLIENT_PORT, pkt6->getLocalPort());
+    EXPECT_EQ(DHCP6_SERVER_PORT, pkt6->getRemotePort());
+    EXPECT_EQ(tc.socket_.addr_, pkt6->getLocalAddr());
+    EXPECT_EQ(asiolink::IOAddress("FF05::1:3"), pkt6->getRemoteAddr());
+    // Packet should be relayed.
+    EXPECT_EQ(pkt6->relay_info_.size(), 1);
+    EXPECT_EQ(pkt6->relay_info_[0].hop_count_, 0);
+    EXPECT_EQ(pkt6->relay_info_[0].msg_type_, DHCPV6_RELAY_FORW);
+    EXPECT_EQ(pkt6->relay_info_[0].linkaddr_, tc.socket_.addr_);
+    EXPECT_EQ(pkt6->relay_info_[0].peeraddr_, tc.socket_.addr_);
+    // Checking if relayed option is there.
+    OptionBuffer opt_data = pkt6->relay_info_[0].options_.find(32)->second->getData();
+    EXPECT_EQ(4, opt_data.size());
+    EXPECT_EQ("0x00000E10", pkt6->relay_info_[0].options_.find(32)->second->toHexString());
+}
+
+TEST_F(TestControlTest, Packet4Exchange) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -r 100 -n 10 -R 20 -L 10547 127.0.0.1");
+    bool use_templates = false;
+    NakedTestControl tc(opt);
+    testPkt4Exchange(iterations_num, iterations_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Discovery + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::DO), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::DO), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RA), 0);
+}
+
+TEST_F(TestControlTest, Packet4ExchangeFromTemplate) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+
+    processCmdLine(opt, "perfdhcp -l fake -r 100 -R 20 -n 20 -L 10547"
+                   " -T " + getFullPath("discover-example.hex")
+                   + " -T " + getFullPath("request4-example.hex")
+                   + " 127.0.0.1");
+    const int received_num = 10;
+    bool use_templates = true;
+    NakedTestControl tc(opt);
+    testPkt4Exchange(iterations_num, received_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num + received_num);  // Discovery + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::DO), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::DO), received_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RA), received_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RA), 0);
+}
+
+TEST_F(TestControlTest, Packet6Exchange) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -6 -r 100 -n 10 -R 20 -L 10547 ::1");
+    bool use_templates = false;
+    NakedTestControl tc(opt);
+    testPkt6Exchange(iterations_num, iterations_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Solicit + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RR), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RR), 0);
+}
+
+TEST_F(TestControlTest, Packet6ExchangeFromTemplate) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -6 -r 100 -n 10 -R 20 -L 10547"
+                   " -T " + getFullPath("solicit-example.hex")
+                   + " -T " + getFullPath("request6-example.hex ::1"));
+    NakedTestControl tc(opt);
+
+    // For the first 3 packets we are simulating responses from server.
+    // For other packets we don't so packet as 4,5,6 will be dropped and
+    // then test should be interrupted and actual number of iterations will
+    // be 6.
+    const int received_num = 3;
+    // Simulate the number of Solicit-Advertise-Request-Reply (SARR) exchanges.
+    // The test function generates server's responses and passes it to the
+    // TestControl class methods for processing. All exchanged packets carry
+    // the IA_NA option to simulate the IPv6 address acquisition and to verify
+    // that the IA_NA options returned by the server are processed correctly.
+    bool use_templates = true;
+    testPkt6Exchange(iterations_num, received_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num + received_num); // Solicit + Advertise
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::SA), received_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RR), received_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RR), 0);
+}
+
+TEST_F(TestControlTest, Packet6ExchangeAddressOnly) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -e address-only"
+                   " -6 -r 100 -n 10 -R 20 -L 10547 ::1");
+    // Set number of received packets equal to number of iterations.
+    // This simulates no packet drops.
+    bool use_templates = false;
+
+    // Simulate the number of Solicit-Advertise-Request-Reply (SARR) exchanges.
+    // The test function generates server's responses and passes it to the
+    // TestControl class methods for processing. All exchanged packets carry
+    // the IA_NA option to simulate the IPv6 address acquisition and to verify
+    // that the IA_NA options returned by the server are processed correctly.
+    NakedTestControl tc(opt);
+    testPkt6Exchange(iterations_num, iterations_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Solicit + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RR), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RR), 0);
+}
+
+TEST_F(TestControlTest, Packet6ExchangePrefixDelegation) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -e prefix-only"
+                   " -6 -r 100 -n 10 -R 20 -L 10547 ::1");
+    // Set number of received packets equal to number of iterations.
+    // This simulates no packet drops.
+    bool use_templates = false;
+
+    // Simulate the number of Solicit-Advertise-Request-Reply (SARR) exchanges.
+    // The test function generates server's responses and passes it to the
+    // TestControl class methods for processing. All exchanged packets carry
+    // the IA_PD option to simulate the Prefix Delegation and to verify that
+    // the IA_PD options returned by the server are processed correctly.
+    NakedTestControl tc(opt);
+    testPkt6Exchange(iterations_num, iterations_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Discovery + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RR), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RR), 0);
+}
+
+TEST_F(TestControlTest, Packet6ExchangeAddressAndPrefix) {
+    const int iterations_num = 100;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -e address-and-prefix"
+                   " -6 -r 100 -n 10 -R 20 -L 10547 ::1");
+    // Set number of received packets equal to number of iterations.
+    // This simulates no packet drops.
+    bool use_templates = false;
+    // Simulate the number of Solicit-Advertise-Request-Reply (SARR) exchanges.
+    // The test function generates server's responses and passes it to the
+    // TestControl class methods for processing. All exchanged packets carry
+    // either IA_NA or IA_PD options to simulate the address and prefix
+    // acquisition with the single message and to verify that the IA_NA
+    // and IA_PD options returned by the server are processed correctly.
+    NakedTestControl tc(opt);
+    testPkt6Exchange(iterations_num, iterations_num, use_templates, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Solicit + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RR), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RR), 0);
+}
+
+TEST_F(TestControlTest, PacketTemplates) {
+    std::vector<uint8_t> template1(256);
+    std::string file1("test1.hex");
+    std::vector<uint8_t> template2(233);
+    std::string file2("test2.hex");
+    for (size_t i = 0; i < template1.size(); ++i) {
+        template1[i] = static_cast<uint8_t>(random() % 256);
+    }
+    for (size_t i = 0; i < template2.size(); ++i) {
+        template2[i] = static_cast<uint8_t>(random() % 256);
+    }
+    // Size of the file is 2 times larger than binary data size.
+    ASSERT_TRUE(createTemplateFile(file1, template1, template1.size() * 2));
+    ASSERT_TRUE(createTemplateFile(file2, template2, template2.size() * 2));
+
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1"
+                   " -T " + file1 + " -T " + file2 + " all");
+    NakedTestControl tc(opt);
+
+    tc.initPacketTemplates();
+    TestControl::TemplateBuffer buf1;
+    TestControl::TemplateBuffer buf2;
+    buf1 = tc.getTemplateBuffer(0);
+    buf2 = tc.getTemplateBuffer(1);
+    ASSERT_EQ(template1.size(), buf1.size());
+    ASSERT_EQ(template2.size(), buf2.size());
+    EXPECT_TRUE(std::equal(template1.begin(), template1.end(), buf1.begin()));
+    EXPECT_TRUE(std::equal(template2.begin(), template2.end(), buf2.begin()));
+
+    // Try to read template file with odd number of digits.
+    std::string file3("test3.hex");
+    // Size of the file is 2 times larger than binary data size and it is always
+    // even number. Substracting 1 makes file size odd.
+    ASSERT_TRUE(createTemplateFile(file3, template1, template1.size() * 2 - 1));
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 -T " + file3 + " all");
+    EXPECT_THROW(tc.initPacketTemplates(), isc::OutOfRange);
+
+    // Try to read empty file.
+    std::string file4("test4.hex");
+    ASSERT_TRUE(createTemplateFile(file4, template2, 0));
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 -T " + file4 + " all");
+    EXPECT_THROW(tc.initPacketTemplates(), isc::OutOfRange);
+
+    // Try reading file with non hexadecimal characters.
+    std::string file5("test5.hex");
+    ASSERT_TRUE(createTemplateFile(file5, template1, template1.size() * 2, true));
+    processCmdLine(opt, "perfdhcp -l 127.0.0.1 -T " + file5 + " all");
+    EXPECT_THROW(tc.initPacketTemplates(), isc::BadValue);
+}
+
+// This test verifies that DHCPv4 renew (DHCPREQUEST) messages can be
+// sent for acquired leases.
+TEST_F(TestControlTest, processRenew4) {
+    testSendRenewRelease4(DHCPREQUEST);
+}
+
+// This test verifies that DHCPv4 release (DHCPRELEASE) messages can be
+// sent for acquired leases.
+TEST_F(TestControlTest, processRelease4) {
+    testSendRenewRelease4(DHCPRELEASE);
+}
+
+// This test verifies that DHCPv6 Renew messages can be sent for acquired
+// leases.
+TEST_F(TestControlTest, processRenew6) {
+    testSendRenewRelease6(DHCPV6_RENEW);
+}
+
+// This test verifies that DHCPv6 Release messages can be sent for acquired
+// leases.
+TEST_F(TestControlTest, processRelease6) {
+    testSendRenewRelease6(DHCPV6_RELEASE);
+}
+
+// This test verifies that DHCPREQUEST is created correctly from the
+// DHCPACK message.
+TEST_F(TestControlTest, createRenew4) {
+    testCreateRenewRelease4(DHCPREQUEST);
+}
+
+// This test verifies that DHCPRELEASE is created correctly from the
+// DHCPACK message.
+TEST_F(TestControlTest, createRelease4) {
+    testCreateRenewRelease4(DHCPRELEASE);
+}
+
+// This test verifies that the DHCPV6 Renew message is created correctly
+// and that it comprises all required options.
+TEST_F(TestControlTest, createRenew6) {
+    testCreateRenewRelease6(DHCPV6_RENEW);
+}
+
+// This test verifies that the DHCPv6 Release message is created correctly
+// and that it comprises all required options.
+TEST_F(TestControlTest, createRelease6) {
+    testCreateRenewRelease6(DHCPV6_RELEASE);
+}
+
+// This test verifies that the counter of rejected leases in
+// Solicit-Advertise message exchange works correctly
+TEST_F(TestControlTest, rejectedLeasesAdv) {
+    testCountRejectedLeasesSolAdv();
+}
+
+// Test checks if sendDiscover really includes custom options
+TEST_F(TestControlTest, sendDiscoverExtraOpts) {
+    // Important parameters here:
+    // -xT - save first packet of each type for templates (useful for packet inspection)
+    // -o 200,abcdef1234 - send option 200 with hex content: ab:cd:ef:12:34
+    // -o 201,00 - send option 201 with hex content: 00
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -4 -l fake -xT -L 10068"
+                   " -o 200,abcdef1234 -o 201,00 -r 1 127.0.0.1");
+
+    // Create test control and set up some basic defaults.
+    NakedTestControl tc(opt);
+    tc.registerOptionFactories();
+    NakedTestControl::IncrementalGeneratorPtr gen(new NakedTestControl::IncrementalGenerator());
+    tc.setTransidGenerator(gen);
+
+    // Make tc send the packet. The first packet of each type is saved in templates.
+    tc.sendDiscover4();
+
+    // Let's find the packet and see if it includes the right option.
+    auto pkt_it = tc.template_packets_v4_.find(DHCPDISCOVER);
+    ASSERT_TRUE(pkt_it != tc.template_packets_v4_.end());
+
+    checkOptions20x(pkt_it->second);
+}
+
+// Test checks if regular packet exchange inserts the extra v4 options
+// specified on command line.
+TEST_F(TestControlTest, Packet4ExchangeExtraOpts) {
+    // Important parameters here:
+    // -xT - save first packet of each type for templates (useful for packet inspection)
+    // -o 200,abcdef1234 - send option 200 with hex content: ab:cd:ef:12:34
+    // -o 201,00 - send option 201 with hex content: 00
+    const int iterations_num = 1;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -4 -o 200,abcdef1234 -o 201,00 "
+                   "-r 100 -n 10 -R 20 -xT -L 10547 127.0.0.1");
+
+    NakedTestControl tc(opt);
+    tc.registerOptionFactories();
+
+    // Do the actual exchange.
+    testPkt4Exchange(iterations_num, iterations_num, false, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Discovery + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::DO), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::DO), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RA), 0);
+
+    // Check if Discover was recored and if it contains options 200 and 201.
+    auto disc = tc.template_packets_v4_.find(DHCPDISCOVER);
+    ASSERT_TRUE(disc != tc.template_packets_v4_.end());
+    checkOptions20x(disc->second);
+
+    // Check if Request was recored and if it contains options 200 and 201.
+    auto req = tc.template_packets_v4_.find(DHCPREQUEST);
+    ASSERT_TRUE(req != tc.template_packets_v4_.end());
+    checkOptions20x(req->second);
+}
+
+// Test checks if regular packet exchange inserts the extra v6 options
+// specified on command line.
+TEST_F(TestControlTest, Packet6ExchangeExtraOpts) {
+    // Important parameters here:
+    // -xT - save first packet of each type for templates (useful for packet inspection)
+    // -o 200,abcdef1234 - send option 200 with hex content: ab:cd:ef:12:34
+    // -o 201,00 - send option 201 with hex content: 00
+    const int iterations_num = 1;
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake"
+                   " -6 -e address-only"
+                   " -xT -o 200,abcdef1234 -o 201,00 "
+                   " -r 100 -n 10 -R 20 -L 10547 ::1");
+
+    // Simulate the number of Solicit-Advertise-Request-Reply (SARR) exchanges.
+    // The test function generates server's responses and passes it to the
+    // TestControl class methods for processing.
+    // First packet of each type is recorded as a template packet. The check
+    // inspects this template to see if the expected options are really there.
+    NakedTestControl tc(opt);
+    testPkt6Exchange(iterations_num, iterations_num, false, tc);
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, iterations_num * 2); // Solicit + Request
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::SA), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getSentPacketsNum(ExchangeType::RR), iterations_num);
+    EXPECT_EQ(tc.stats_mgr_.getRcvdPacketsNum(ExchangeType::RR), 0);
+
+    // Check if Solicit was recorded and if it contains options 200 and 201.
+    auto sol = tc.template_packets_v6_.find(DHCPV6_SOLICIT);
+    ASSERT_TRUE(sol != tc.template_packets_v6_.end());
+    checkOptions20x(sol->second);
+
+    // Check if Request was recorded and if it contains options 200 and 201.
+    auto req = tc.template_packets_v6_.find(DHCPV6_REQUEST);
+    ASSERT_TRUE(req != tc.template_packets_v6_.end());
+    checkOptions20x(req->second);
+}
+
+// Test checks if multiple v4 PRL options can be sent. They should be merged
+// into a single PRL option by perfdhcp.
+TEST_F(TestControlTest, sendDiscoverMultiplePRLs) {
+    // Important parameters here:
+    // -o 55,1234 - send option 55 with hex content '1234'
+    // -o 55,abcd - send option 55 with hex content 'abcd'
+    CommandOptions opt;
+    processCmdLine(
+        opt, "perfdhcp -4 -l fake -o 55,1234 -o 55,abcd -r 1 -xT 127.0.0.1");
+
+    // Create test control and set up some basic defaults.
+    NakedTestControl tc(opt);
+    tc.registerOptionFactories();
+    NakedTestControl::IncrementalGeneratorPtr gen(
+        boost::make_shared<NakedTestControl::IncrementalGenerator>());
+    tc.setTransidGenerator(gen);
+
+    // Send the packet.
+    tc.sendDiscover4();
+
+    // Let's find the packet and see if it includes the right option.
+    auto const pkt_it(tc.template_packets_v4_.find(DHCPDISCOVER));
+    ASSERT_TRUE(pkt_it != tc.template_packets_v4_.end());
+
+    checkOptions55(pkt_it->second,
+                   {
+                       // Added to all perfdhcp egress packets by default
+                       DHO_SUBNET_MASK,
+                       DHO_BROADCAST_ADDRESS,
+                       DHO_TIME_OFFSET,
+                       DHO_ROUTERS,
+                       DHO_DOMAIN_NAME,
+                       DHO_DOMAIN_NAME_SERVERS,
+                       DHO_HOST_NAME,
+                       // Explicitly added in this test
+                       0x12,
+                       0x34,
+                       0xab,
+                       0xcd,
+                   });
+}
+
+// This test checks if HA failure can be simulated using -y and -Y options with DHCPv4.
+TEST_F(TestControlTest, haFailure4) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -l fake -r 1 -n 1 -R 2 -y 10 -Y 0 -L 10547 127.0.0.1");
+    NakedTestControl tc(opt);
+
+    tc.sendPackets(1); // Send one packet. It should have secs set to 1.
+    sleep(1);          // wait a second...
+    tc.sendPackets(1); // and send another packet. This should have secs set to 2.
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, 2); // Make sure the stats are up.
+    ASSERT_EQ(tc.fake_sock_.sent_pkts4_.size(), 2); // And the packets were captured.
+    Pkt4Ptr dis1 = tc.fake_sock_.sent_pkts4_[0];
+    Pkt4Ptr dis2 = tc.fake_sock_.sent_pkts4_[1];
+    ASSERT_TRUE(dis1);
+    ASSERT_TRUE(dis2);
+
+    EXPECT_EQ(dis1->getSecs(), 1); // Make sure it has secs set to 1.
+    EXPECT_GT(dis2->getSecs(), 1); // Should be 2, but we want to avoid rare cases when the test
+                                   // could fall exactly on the second boundary, so checking for
+                                   // greater than 1.
+}
+
+// This test checks if HA failure can be simulated using -y and -Y options with DHCPv6.
+TEST_F(TestControlTest, haFailure6) {
+    CommandOptions opt;
+    processCmdLine(opt, "perfdhcp -6 -l fake -r 1 -n 1 -R 2 -y 10 -Y 0 -L 10547 all");
+    NakedTestControl tc(opt);
+
+    tc.sendPackets(1); // Send one packet. It should have secs set to 1.
+    sleep(1);          // wait a second...
+    tc.sendPackets(1); // and send another packet. This should have secs set to 2.
+
+    EXPECT_EQ(tc.fake_sock_.sent_cnt_, 2); // Make sure the stats are up.
+    ASSERT_EQ(tc.fake_sock_.sent_pkts6_.size(), 2); // And the packets were captured.
+    Pkt6Ptr sol1 = tc.fake_sock_.sent_pkts6_[0];
+    Pkt6Ptr sol2 = tc.fake_sock_.sent_pkts6_[1];
+    ASSERT_TRUE(sol1);
+    ASSERT_TRUE(sol2);
+    OptionUint16Ptr elapsed1(boost::dynamic_pointer_cast<OptionUint16>(sol1->getOption(D6O_ELAPSED_TIME)));
+    OptionUint16Ptr elapsed2(boost::dynamic_pointer_cast<OptionUint16>(sol2->getOption(D6O_ELAPSED_TIME)));
+    ASSERT_TRUE(elapsed1);
+    ASSERT_TRUE(elapsed2);
+
+    EXPECT_EQ(elapsed1->getValue(), 100);
+    EXPECT_GT(elapsed2->getValue(), 100);
+}
diff --git a/src/bin/perfdhcp/tests/testdata/Makefile.am b/src/bin/perfdhcp/tests/testdata/Makefile.am
new file mode 100644
index 0000000..19cf25d
--- /dev/null
+++ b/src/bin/perfdhcp/tests/testdata/Makefile.am
@@ -0,0 +1,5 @@
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+
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+EXTRA_DIST += solicit-example.hex request6-example.hex
+EXTRA_DIST += mac-list.txt relay4-list.txt relay6-list.txt
diff --git a/src/bin/perfdhcp/tests/testdata/Makefile.in b/src/bin/perfdhcp/tests/testdata/Makefile.in
new file mode 100644
index 0000000..299c09b
--- /dev/null
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new file mode 100644
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--- /dev/null
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new file mode 100644
index 0000000..e9e30e0
--- /dev/null
+++ b/src/bin/perfdhcp/tests/testdata/mac-list.txt
@@ -0,0 +1,4 @@
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diff --git a/src/bin/perfdhcp/tests/testdata/relay4-list.txt b/src/bin/perfdhcp/tests/testdata/relay4-list.txt
new file mode 100644
index 0000000..6d3db81
--- /dev/null
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new file mode 100644
index 0000000..ce98e94
--- /dev/null
+++ b/src/bin/perfdhcp/tests/testdata/relay6-list.txt
@@ -0,0 +1,2 @@
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new file mode 100644
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--- /dev/null
+++ b/src/bin/perfdhcp/tests/testdata/request4-example.hex
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--- /dev/null
+++ b/src/bin/perfdhcp/tests/testdata/solicit-example.hex
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