diff --git a/src/lp/nack-header.hpp b/src/lp/nack-header.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Eric Newberry <enewberry@email.arizona.edu>
+ */
+
+#ifndef NDN_CXX_LP_NACK_HEADER_HPP
+#define NDN_CXX_LP_NACK_HEADER_HPP
+
+#include "../common.hpp"
+#include "../encoding/encoding-buffer.hpp"
+#include "../encoding/block-helpers.hpp"
+
+#include "tlv.hpp"
+
+namespace ndn {
+namespace lp {
+
+/**
+ * \brief indicates the reason type of a network NACK
+ */
+enum class NackReason {
+  NONE = 0,
+  CONGESTION = 50,
+  DUPLICATE = 100,
+  NO_ROUTE = 150
+};
+
+std::ostream&
+operator<<(std::ostream& os, NackReason reason);
+
+/**
+ * \brief represents a Network NACK header
+ */
+class NackHeader
+{
+public:
+  NackHeader();
+
+  explicit
+  NackHeader(const Block& block);
+
+  template<encoding::Tag TAG>
+  size_t
+  wireEncode(EncodingImpl<TAG>& encoder) const;
+
+  const Block&
+  wireEncode() const;
+
+  void
+  wireDecode(const Block& wire);
+
+public: // reason
+  /**
+   * \return reason code
+   * \retval NackReason::NONE if NackReason element does not exist or has an unknown code
+   */
+  NackReason
+  getReason() const;
+
+  /**
+   * \brief set reason code
+   * \param reason a reason code; NackReason::NONE clears the reason
+   */
+  NackHeader&
+  setReason(NackReason reason);
+
+private:
+  NackReason m_reason;
+  mutable Block m_wire;
+};
+
+} // namespace lp
+} // namespace ndn
+
+#endif // NDN_CXX_LP_NACK_HEADER_HPP
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