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diff --git a/src/bin/dhcp6/json_config_parser.h b/src/bin/dhcp6/json_config_parser.h
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+++ b/src/bin/dhcp6/json_config_parser.h
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+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef DHCP6_CONFIG_PARSER_H
+#define DHCP6_CONFIG_PARSER_H
+
+#include <cc/data.h>
+#include <dhcpsrv/parsers/dhcp_parsers.h>
+#include <exceptions/exceptions.h>
+
+#include <string>
+
+/// @todo: This header file and its .cc counterpart are very similar between
+/// DHCPv4 and DHCPv6. They should be merged.
+
+namespace isc {
+namespace dhcp {
+
+class Dhcpv6Srv;
+
+/// @brief Configure DHCPv6 server (@c Dhcpv6Srv) with a set of configuration
+/// values.
+///
+/// This function parses configuration information stored in @c config_set
+/// and configures the @c server by applying the configuration to it.
+/// It provides the strong exception guarantee as long as the underlying
+/// derived class implementations of @c DhcpConfigParser meet the assumption,
+/// that is, it ensures that either configuration is fully applied or the
+/// state of the server is intact.
+///
+/// If a syntax or semantics level error happens during the configuration
+/// (such as malformed configuration or invalid configuration parameter),
+/// this function returns appropriate error code.
+///
+/// This function is called every time a new configuration is received. The
+/// extra parameter is a reference to DHCPv6 server component. It is currently
+/// not used and CfgMgr::instance() is accessed instead.
+///
+/// Test-only mode is supported. If check_only flag is set to true, the
+/// configuration is parsed, but the actual change is not applied. The goal is
+/// to have the ability to test configuration.
+///
+/// This method does not throw. It catches all exceptions and returns them as
+/// reconfiguration statuses. It may return the following response codes:
+/// 0 - configuration successful
+/// 1 - malformed configuration (parsing failed)
+/// 2 - commit failed (parsing was successful, but failed to store the
+/// values in to server's configuration)
+///
+/// @param server DHCPv6 server object.
+/// @param config_set a new configuration (JSON) for DHCPv6 server.
+/// @param check_only whether this configuration is for testing only.
+/// @param extra_checks load hooks and perform extra checks if this flag is true
+///        and check_only is also true, otherwise perform simple check if
+///        check_only is true.
+/// @return answer that contains result of the reconfiguration.
+isc::data::ConstElementPtr
+configureDhcp6Server(Dhcpv6Srv& server, isc::data::ConstElementPtr config_set,
+                     bool check_only = false, bool extra_checks = false);
+
+}  // namespace dhcp
+}  // namespace isc
+
+#endif // DHCP6_CONFIG_PARSER_H