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diff --git a/src/bin/dhcp4/dhcp4_log.h b/src/bin/dhcp4/dhcp4_log.h
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+// Copyright (C) 2012-2018 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/.
+
+/// @file dhcp4_log.h
+/// Contains declarations for loggers used by the DHCPv4 server component.
+
+#ifndef DHCP4_LOG_H
+#define DHCP4_LOG_H
+
+#include <log/logger_support.h>
+#include <log/macros.h>
+#include <dhcp4/dhcp4_messages.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @name Constants defining debug levels for logging in DHCPv4 server.
+//@{
+
+/// @brief Debug level used to log information during server startup.
+extern const int DBG_DHCP4_START;
+
+/// @brief Debug level used to log information during server shutdown.
+extern const int DBG_DHCP4_SHUT;
+
+/// @brief Debug level used to log receiving commands.
+extern const int DBG_DHCP4_COMMAND;
+
+/// @brief Debug level used to trace basic operations within the code.
+extern const int DBG_DHCP4_BASIC;
+
+/// @brief Debug level used to trace hook related operations
+extern const int DBG_DHCP4_HOOKS;
+
+/// @brief Debug level used to log the traces with some basic data.
+///
+/// The basic data includes summary information, e.g. summary of the
+/// information returned by a particular function. It may also include
+/// more detailed information in cases when it is warranted and the
+/// extraction of the data doesn't impact the server's performance
+/// significantly.
+extern const int DBG_DHCP4_BASIC_DATA;
+
+/// @brief Debug level used to trace detailed errors.
+///
+/// Trace detailed operations, including errors raised when processing invalid
+/// packets.  (These are not logged at severities of WARN or higher for fear
+/// that a set of deliberately invalid packets set to the server could overwhelm
+/// the logging.)
+extern const int DBG_DHCP4_DETAIL;
+
+/// @brief This level is used to log the contents of packets received and sent.
+extern const int DBG_DHCP4_DETAIL_DATA;
+
+//@}
+
+/// @name Constants holding names of loggers for the DHCPv4 server.
+//@{
+
+/// @brief Defines the name of the root level (default) logger.
+extern const char* DHCP4_ROOT_LOGGER_NAME;
+
+/// @brief Name of the base logger for DHCPv4 server.
+extern const char* DHCP4_APP_LOGGER_NAME;
+
+/// @brief Name of the logger for rejected packets.
+extern const char* DHCP4_BAD_PACKET_LOGGER_NAME;
+
+/// @brief Name of the logger for processed packets.
+extern const char* DHCP4_PACKET_LOGGER_NAME;
+
+/// @brief Name of the logger for options parser.
+extern const char* DHCP4_OPTIONS_LOGGER_NAME;
+
+/// @brief Name of the logger for hostname or FQDN processing.
+extern const char* DHCP4_DDNS_LOGGER_NAME;
+
+/// @brief Name of the logger for lease allocation logic.
+extern const char* DHCP4_LEASE_LOGGER_NAME;
+
+//@}
+
+/// @name Loggers used by the DHCPv4 server
+//@{
+
+/// @brief Base logger for DHCPv4 server.
+extern isc::log::Logger dhcp4_logger;
+
+/// @brief Logger for rejected packets.
+///
+/// Here "bad packets" are packets that are either dropped (i.e malformed,
+/// unsupported types) or packets that are rejected and NAKed for logical
+/// reasons.
+extern isc::log::Logger bad_packet4_logger;
+
+/// @brief Logger for processed packets.
+///
+/// This logger is used to issue log messages related to the reception and
+/// sending DHCP packets.
+extern isc::log::Logger packet4_logger;
+
+/// @brief Logger for options parser.
+///
+/// This logger is used to issue log messages related to processing of the
+/// DHCP options
+extern isc::log::Logger options4_logger;
+
+/// @brief Logger for Hostname or FQDN processing.
+///
+/// This logger is used to issue log messages related to processing the
+/// hostnames, FQDNs and sending name change requests to D2.
+extern isc::log::Logger ddns4_logger;
+
+/// @brief Logger for lease allocation logic.
+///
+/// This logger is used to issue log messages related to lease allocation.
+extern isc::log::Logger lease4_logger;
+
+//@}
+
+} // namespace dhcp4
+} // namespace isc
+
+#endif // DHCP4_LOG_H