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diff --git a/src/lib/dhcpsrv/cfg_4o6.h b/src/lib/dhcpsrv/cfg_4o6.h
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+++ b/src/lib/dhcpsrv/cfg_4o6.h
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+// Copyright (C) 2015-2019 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 CFG_4OVER6_H
+#define CFG_4OVER6_H
+
+#include <asiolink/io_address.h>
+#include <cc/cfg_to_element.h>
+#include <util/optional.h>
+#include <string>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief This structure contains information about DHCP4o6 (RFC7341)
+///
+/// DHCP4o6 is completely optional. If it is not enabled, this structure
+/// does not contain any information.
+struct Cfg4o6 : public isc::data::CfgToElement {
+
+    /// the default constructor.
+    ///
+    /// Initializes fields to their default value.
+    Cfg4o6()
+    :enabled_(false), subnet4o6_(std::make_pair(asiolink::IOAddress("::"), 128u), true) {
+    }
+
+    /// @brief Returns whether the DHCP4o6 is enabled or not.
+    /// @return true if enabled
+    bool enabled() const {
+        return (enabled_);
+    }
+
+    /// @brief Sets the DHCP4o6 enabled status.
+    /// @param enabled specifies if the DHCP4o6 should be enabled or not
+    void enabled(bool enabled) {
+        enabled_ = enabled;
+    }
+
+    /// @brief Returns the DHCP4o6 interface.
+    /// @return value of the 4o6-interface parameter.
+    util::Optional<std::string> getIface4o6() const {
+        return (iface4o6_);
+    }
+
+    /// @brief Sets the 4o6-interface.
+    /// @param iface name of the network interface the 4o6 traffic is received on
+    void setIface4o6(const std::string& iface) {
+        iface4o6_ = iface;
+        enabled_ = true;
+    }
+
+    /// @brief Returns prefix/len for the IPv6 subnet.
+    /// @return prefix/length pair
+    util::Optional<std::pair<asiolink::IOAddress, uint8_t> > getSubnet4o6() const {
+        return (subnet4o6_);
+    }
+
+    /// @brief Sets the prefix/length information (content of the 4o6-subnet).
+    /// @param subnet IOAddress that represents a prefix
+    /// @param prefix specifies prefix length
+    void setSubnet4o6(const asiolink::IOAddress& subnet, uint8_t prefix) {
+        subnet4o6_ = std::make_pair(subnet, prefix);
+        enabled_ = true;
+    }
+
+    /// @brief Returns the interface-id.
+    /// @return the option representing interface-id (or NULL)
+    OptionPtr getInterfaceId() const {
+        return (interface_id_);
+    }
+
+    /// @brief Sets the interface-id
+    /// @param opt option to be used as interface-id match
+    void setInterfaceId(const OptionPtr& opt) {
+        interface_id_ = opt;
+        enabled_ = true;
+    }
+
+    /// @brief Unparse a configuration object
+    ///
+    /// @return a pointer to unparsed configuration
+    virtual isc::data::ElementPtr toElement() const;
+
+private:
+
+    /// Specifies if 4o6 is enabled on this subnet.
+    bool enabled_;
+
+    /// Specifies the network interface used as v4 subnet selector.
+    util::Optional<std::string> iface4o6_;
+
+    /// Specifies the IPv6 subnet used for v4 subnet selection.
+    util::Optional<std::pair<asiolink::IOAddress, uint8_t> > subnet4o6_;
+
+    /// Specifies the v6 interface-id used for v4 subnet selection.
+    OptionPtr interface_id_;
+};
+
+} // end of isc::dhcp namespace
+} // end of isc namespace
+
+#endif