Adding upstream version 2.4.1.upstream/2.4.1upstream

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

26 files changed, 8082 insertions, 0 deletions

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
+run_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+run_unittests_LDADD += $(CRYPTO_LIBS) $(BOOST_LIBS) $(GTEST_LDADD)
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/bin/perfdhcp/tests/Makefile.in b/src/bin/perfdhcp/tests/Makefile.in
new file mode 100644
index 0000000..43865a3
--- /dev/null
+++ b/src/bin/perfdhcp/tests/Makefile.in
@@ -0,0 +1,1284 @@
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+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	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:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(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 ./$(DEPDIR)/run_unittests-test_control_unittest.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(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 @@
+SUBDIRS = .
+
+EXTRA_DIST = discover-example.hex request4-example.hex
+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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@@ -0,0 +1 @@
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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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diff --git a/src/bin/perfdhcp/tests/testdata/request4-example.hex b/src/bin/perfdhcp/tests/testdata/request4-example.hex
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--- /dev/null
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--- /dev/null
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--- /dev/null
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