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diff --git a/src/lib/dhcp/option6_ia.h b/src/lib/dhcp/option6_ia.h
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+++ b/src/lib/dhcp/option6_ia.h
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+// Copyright (C) 2011-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef OPTION_IA_H
+#define OPTION_IA_H
+
+#include <dhcp/option.h>
+#include <boost/shared_ptr.hpp>
+#include <stdint.h>
+
+namespace isc {
+namespace dhcp {
+
+class Option6IA;
+
+/// A pointer to the @c Option6IA object.
+typedef boost::shared_ptr<Option6IA> Option6IAPtr;
+
+class Option6IA: public Option {
+
+public:
+    /// Length of IA_NA and IA_PD content
+    const static size_t OPTION6_IA_LEN = 12;
+
+    /// @brief Ctor, used for constructed options, usually during transmission.
+    ///
+    /// @param type option type (usually 4 for IA_NA, 25 for IA_PD)
+    /// @param iaid identity association identifier (id of IA)
+    Option6IA(uint16_t type, uint32_t iaid);
+
+    /// @brief Ctor, used for received options.
+    ///
+    /// @param type option type (usually 4 for IA_NA, 25 for IA_PD)
+    /// @param begin iterator to first byte of option data
+    /// @param end iterator to end of option data (first byte after option end)
+    Option6IA(uint16_t type, OptionBuffer::const_iterator begin,
+              OptionBuffer::const_iterator end);
+
+    /// @brief Copies this option and returns a pointer to the copy.
+    virtual OptionPtr clone() const;
+
+    /// Writes option in wire-format to buf, returns pointer to first unused
+    /// byte after stored option.
+    ///
+    /// @param buf buffer (option will be stored here)
+    /// @param check if set to false, allows options larger than 255 for v4
+    void pack(isc::util::OutputBuffer& buf, bool check = true) const;
+
+    /// @brief Parses received buffer
+    ///
+    /// Parses received buffer and returns offset to the first unused byte after
+    /// parsed option.
+    ///
+    /// @param begin iterator to first byte of option data
+    /// @param end iterator to end of option data (first byte after option end)
+    virtual void unpack(OptionBufferConstIter begin, OptionBufferConstIter end);
+
+    /// Provides human readable text representation
+    ///
+    /// @param indent number of leading space characters
+    ///
+    /// @return string with text representation
+    virtual std::string toText(int indent = 0) const;
+
+    /// Sets T1 timer.
+    ///
+    /// @param t1 t1 value to be set
+    void setT1(uint32_t t1) { t1_ = t1; }
+
+    /// Sets T2 timer.
+    ///
+    /// @param t2 t2 value to be set
+    void setT2(uint32_t t2) { t2_ = t2; }
+
+    /// Sets Identity Association Identifier.
+    ///
+    /// @param iaid IAID value to be set
+    void setIAID(uint32_t iaid) { iaid_ = iaid; }
+
+    /// Returns IA identifier.
+    ///
+    /// @return IAID value.
+    ///
+    uint32_t getIAID() const { return iaid_; }
+
+    /// Returns T1 timer.
+    ///
+    /// @return T1 value.
+    uint32_t getT1() const { return t1_; }
+
+    /// Returns T2 timer.
+    ///
+    /// @return T2 value.
+    uint32_t getT2() const { return t2_; }
+
+    /// @brief returns complete length of option
+    ///
+    /// Returns length of this option, including option header and suboptions
+    ///
+    /// @return length of this option
+    virtual uint16_t len() const;
+
+protected:
+
+    /// keeps IA identifier
+    uint32_t iaid_;
+
+    /// keeps T1 timer value
+    uint32_t t1_;
+
+    /// keeps T2 timer value
+    uint32_t t2_;
+};
+
+} // isc::dhcp namespace
+} // isc namespace
+
+#endif // OPTION_IA_H