diff --git a/model/ndn-interest-header.h b/model/ndn-interest-header.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Ilya Moiseenko <iliamo@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef _NDN_INTEREST_HEADER_H_
+#define _NDN_INTEREST_HEADER_H_
+
+#include "ns3/integer.h"
+#include "ns3/header.h"
+#include "ns3/simple-ref-count.h"
+#include "ns3/nstime.h"
+
+#include <string>
+#include <vector>
+#include <list>
+
+#include "ndn-name-components.h"
+
+namespace ns3
+{
+  
+/**
+ * Ndn XML definition of Interest
+ * 
+ * Only few important fields are actually implemented in the simulation
+ *
+ * <xs:element name="Interest" type="InterestType"/>
+ * <xs:complexType name="InterestType">
+ *   <xs:sequence>
+ *     <xs:element name="Name" type="NameType"/>
+ *     <xs:element name="MinSuffixComponents" type="xs:nonNegativeInteger"
+ *                         minOccurs="0" maxOccurs="1"/>
+ *     <xs:element name="MaxSuffixComponents" type="xs:nonNegativeInteger"
+ *                         minOccurs="0" maxOccurs="1"/>
+ *     <xs:choice minOccurs="0" maxOccurs="1">
+ *         <xs:element name="PublisherPublicKeyDigest" type="DigestType"/>
+ *         <xs:element name="PublisherCertificateDigest" type="DigestType"/>
+ *         <xs:element name="PublisherIssuerKeyDigest" type="DigestType"/>
+ *         <xs:element name="PublisherIssuerCertificateDigest" type="DigestType"/>
+ *     </xs:choice>
+ *     <xs:element name="Exclude" type="ExcludeType"
+ *                         minOccurs="0" maxOccurs="1"/>
+ *     <xs:element name="ChildSelector" type="xs:nonNegativeInteger"
+ *                         minOccurs="0" maxOccurs="1"/>
+ *     <xs:element name="AnswerOriginKind" type="xs:nonNegativeInteger"
+ *                         minOccurs="0" maxOccurs="1"/>
+ *     <xs:element name="Scope" type="xs:nonNegativeInteger"
+ * 			minOccurs="0" maxOccurs="1"/>
+ *     <xs:element name="InterestLifetime" type="FinegrainLifetimeType"
+ * 			minOccurs="0" maxOccurs="1"/>
+ *     <xs:element name="Nonce" type="Base64BinaryType"
+ * 			minOccurs="0" maxOccurs="1"/>
+ *   </xs:sequence>
+ * </xs:complexType>
+ *
+ * <xs:complexType name="NameType">
+ *   <xs:sequence>
+ *     <xs:element name="Component" type="Base64BinaryType"
+ *                 minOccurs="0" maxOccurs="unbounded"/>
+ *   </xs:sequence>
+ * </xs:complexType>
+ * 
+ * <xs:complexType name="ExcludeType">
+ *   <xs:sequence>
+ *     <xs:choice minOccurs="0" maxOccurs="1">
+ *         <xs:element name="Any" type="EmptyType"/>
+ *         <xs:element name="Bloom" type="Base64BinaryType"/> <!-- Bloom is deprecated --!>
+ *     </xs:choice>
+ *      <xs:sequence minOccurs="0" maxOccurs="unbounded">
+ *         <xs:element name="Component" type="Base64BinaryType"/>
+ *         <xs:choice minOccurs="0" maxOccurs="1">
+ *             <xs:element name="Any" type="EmptyType"/>
+ *             <xs:element name="Bloom" type="Base64BinaryType"/> <!-- Bloom is deprecated --!>
+ *         </xs:choice>
+ *      </xs:sequence>
+ *   </xs:sequence>
+ * </xs:complexType>
+ * 
+ * <!-- Binary representation of time, Unix time epoch, units 2**-12 sec (0.000244140625 sec) -->
+ * <!-- The length limit limit of 6 bytes is not actually to be enforced, but
+ *      it will be a loooooooong time before anyone cares. --> 
+ * 
+ * <!-- Binary representation of relative time, relative to "now" -->
+ * <xs:complexType name="FinegrainLifetimeType">
+ *   <xs:simpleContent>
+ *     <xs:extension base="BinaryTime12">
+ *       <xs:attribute name="ccnbencoding" type="xs:string" fixed="base64Binary"/>
+ *     </xs:extension>
+ *   </xs:simpleContent>
+ * </xs:complexType>
+ *
+ * <xs:simpleType name="BinaryTime12">
+ *     <xs:restriction base="xs:base64Binary">
+ *       <xs:length value="6" fixed="true"/>
+ *     </xs:restriction>
+ * </xs:simpleType>
+ *
+ **/
+
+/**
+  * @brief NDN InterestHeader and routines to serialize/deserialize
+  *
+  * Simplifications:
+  * - Name:  binary name components are not supported
+  * - MinSuffixComponents and MasSuffixComponents: if value is negative (default), will not be serialized
+  * - ChildSelector, AnswerOriginKind: 0 - false, 1 - true, -1 not set
+  * - Publisher* elements are not supported
+  * - Exclude: only simple name matching is supported (Bloom support has been deprecated in Ndn)
+  * - InterestLifetime: ?
+  * - Nonce: 32 bit random integer.  If value is 0, will not be serialized
+  **/
+class NdnInterestHeader : public SimpleRefCount<NdnInterestHeader,Header>
+{
+public:
+  /**
+   * \brief Constructor
+   *
+   * Creates a null header
+   **/
+  NdnInterestHeader ();
+
+  /**
+   * \brief Set interest name
+   *
+   * Sets name of the interest. For example, SetName( ndnNameComponents("prefix")("postfix") );
+   * @param[in] name const pointer to ndnNameComponents object that contains an interest name
+   **/
+  void
+  SetName (const Ptr<NdnNameComponents> &name);
+
+
+  /**
+   * \brief Get interest name
+   *
+   * Gets name of the interest.
+   **/
+  const NdnNameComponents&
+  GetName () const;
+
+  /**
+   * @brief Get smart pointer to the interest name (to avoid extra memory usage)
+   */
+  Ptr<const NdnNameComponents>
+  GetNamePtr () const;
+
+  /**
+   * \brief Set interest MinSuffixComponents
+   *
+   * MinSuffixComponents refer to the number of name components beyond those in the prefix, 
+   * and counting the implicit digest, that may occur in the matching ContentObject.
+   * \see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html for more information.
+   * @param[in] value minimum length of suffix components
+   **/
+  void
+  SetMinSuffixComponents (int32_t value);
+
+  /**
+   * \brief Get interest MinSuffixComponents
+   *
+   * MinSuffixComponents refer to the number of name components beyond those in the prefix, 
+   * and counting the implicit digest, that may occur in the matching ContentObject.
+   * For more information, see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html
+   **/
+  int32_t
+  GetMinSuffixComponents () const;
+
+
+  /**
+   * \brief Set interest MaxSuffixComponents
+   *
+   * MaxSuffixComponents refer to the number of name components beyond those in the prefix, 
+   * and counting the implicit digest, that may occur in the matching ContentObject.
+   * \see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html for more information.
+   * @param[in] value maximum length of suffix components
+   **/
+  void
+  SetMaxSuffixComponents (int32_t value);
+
+  /**
+   * \brief Get interest MaxSuffixComponents
+   *
+   * MaxSuffixComponents refer to the number of name components beyond those in the prefix, 
+   * and counting the implicit digest, that may occur in the matching ContentObject.
+   * For more information, see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html
+   **/
+  int32_t
+  GetMaxSuffixComponents () const;
+
+  /**
+   * \brief Set exclude filer
+   *
+   * For example, SetExclude (ndnNameComponents("exclude1")("exclude2")("exclude3"))
+   * @param[in] exclude const pointer to ndnNameComponents to be excluded 
+   **/
+  void
+  SetExclude (const Ptr<NdnNameComponents> &exclude);
+
+  /**
+   * \brief Check if interest conatins exclude filter
+   *
+   */ 
+  bool
+  IsEnabledExclude () const;
+  
+  /**
+   * \brief Get exclude filter 
+   */
+  const NdnNameComponents&
+  GetExclude () const;
+
+  /**
+   * \brief Set ChildSelector
+   * Often a given interest will match more than one ContentObject within a given content store. 
+   * The ChildSelector provides a way of expressing a preference for which of these should be returned. 
+   * If the value is false, the leftmost child is preferred. If true, the rightmost child is preferred.
+   * \see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html for more information. 
+   * @param[in] value boolean ChildSelector value
+   */
+  void
+  SetChildSelector (bool value);
+
+  /**
+   * \brief Return ChildSelector value
+   * \see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html for more information.
+   *
+   */
+  bool
+  IsEnabledChildSelector () const;
+
+  /**
+   * \brief Set AnswerOriginKind
+   * Default value for AnswerOriginKind is false.
+   * @param[in] value boolean AnswerOriginKind value
+   */
+  void
+  SetAnswerOriginKind (bool value);
+
+  /**
+   * \brief Check the value of AnswerOriginKind
+   *
+   */
+  bool
+  IsEnabledAnswerOriginKind () const;
+
+  /**
+   * \brief Set Scope
+   * Scope limits where the Interest may propagate. 
+   * Scope 0 prevents propagation beyond the local ccnd (even to other applications on the same host).
+   * Scope 1 limits propagation to the applications on the originating host. 
+   * Scope 2 limits propagation to no further than the next host. 
+   * Other values are not defined, and will cause the Interest message to be dropped.
+   * Note that this is not a hop count - the value is not decremented as the interest is forwarded.
+   * @param[in] scope interest scope
+   */
+  void
+  SetScope (int8_t scope);
+
+  /**
+   * \brief Get Scope value
+   * Scope limits where the Interest may propagate. 
+   * Scope 0 prevents propagation beyond the local ccnd (even to other applications on the same host).
+   * Scope 1 limits propagation to the applications on the originating host. 
+   * Scope 2 limits propagation to no further than the next host. 
+   * Other values are not defined, and will cause the Interest message to be dropped.
+   * Note that this is not a hop count - the value is not decremented as the interest is forwarded.
+   */
+  int8_t
+  GetScope () const;
+
+  /**
+   * \brief Set InterestLifetime
+   * InterestLifetime indicates the (approximate) time remaining before the interest times out.
+   * The timeout is relative to the arrival time of the interest at the current node.
+   * \see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html for more information.
+   * @param[in] time interest lifetime  
+   */ 
+  void
+  SetInterestLifetime (Time time);
+
+  /**
+   * \brief Get InterestLifetime value
+   * InterestLifetime indicates the (approximate) time remaining before the interest times out.
+   * The timeout is relative to the arrival time of the interest at the current node.
+   * \see http://www.ndn.org/releases/latest/doc/technical/InterestMessage.html for more information.
+   */ 
+  Time
+  GetInterestLifetime () const;
+
+  /**
+   * \brief Set Nonce
+   * Nonce carries a randomly-genenerated bytestring that is used to detect and discard duplicate Interest messages.
+   * @param[in] nonce Unique packet identification number
+   */
+  void
+  SetNonce (uint32_t nonce);
+
+  /**
+   * \brief Get Nonce value
+   * Nonce carries a randomly-genenerated bytestring that is used to detect and discard duplicate Interest messages.
+   *
+   */
+  uint32_t
+  GetNonce () const;
+  
+  /**
+   * @brief NACK Type
+   * Specifies the type of Interest packet
+   */
+  enum
+    {
+      NORMAL_INTEREST = 0,
+      NACK_LOOP = 10,
+      NACK_CONGESTION = 11,
+      NACK_GIVEUP_PIT = 12,
+    };
+
+  /**
+   * \brief Mark the Interest as a Negative Acknowledgement
+   * Three types of NACKs are supported
+   * 1. NACK_LOOP 
+   * 2. NACK_CONGESTION
+   * 3. NACK_GIVEUP_PIT
+   * @param[in] nackType  NACK_LOOP or NACK_CONGESTION or NACK_GIVEUP_PIT or NORMAL_INTEREST
+   */
+  void
+  SetNack (uint32_t nackType);
+    
+  /**
+  * \brief Get NACK type
+  * Returns NACK_LOOP, NACK_CONGESTION or NACK_GIVEUP_PIT. 
+  * Otherwise, in case of normal interest packet, returns NORMAL_INTEREST (equals 0).
+  */
+  uint32_t
+  GetNack () const;
+
+  //////////////////////////////////////////////////////////////////
+
+  static TypeId GetTypeId (void); ///< @brief Get TypeId of the class
+  virtual TypeId GetInstanceTypeId (void) const; ///< @brief Get TypeId of the instance
+  
+  /**
+   * \brief Print Interest packet 
+   */
+  virtual void Print (std::ostream &os) const;
+  
+  /**
+   * \brief Get the size of Interest packet
+   * Returns the Interest packet size after serialization
+   */
+  virtual uint32_t GetSerializedSize (void) const;
+  
+  /**
+   * \brief Serialize Interest packet
+   * Serializes Interest packet into Buffer::Iterator
+   * @param[in] start buffer to contain serialized Interest packet
+   */
+  virtual void Serialize (Buffer::Iterator start) const;
+  
+  /**
+   * \brief Deserialize Interest packet
+   * Deserializes Buffer::Iterator into Interest packet
+   * @param[in] start buffer that contains serialized Interest packet
+   */ 
+  virtual uint32_t Deserialize (Buffer::Iterator start);
+
+private:
+  Ptr<NdnNameComponents> m_name;     ///< Interest name
+  int32_t m_minSuffixComponents;      ///< Minimum suffix components. not used if negative
+  int32_t m_maxSuffixComponents;      ///< Maximum suffix components. not used if negative
+  Ptr<NdnNameComponents> m_exclude;  ///< Exclude filter
+  bool m_childSelector;               ///< Default value for ChildSelector is false
+  bool m_answerOriginKind;            ///< Default value for AnswerOriginKind is false
+  int8_t m_scope;                     ///< -1 not set, 0 local scope, 1 this host, 2 immediate neighborhood
+  Time  m_interestLifetime;           ///< InterestLifetime
+  uint32_t m_nonce;                   ///< Nonce. not used if zero
+  uint32_t m_nackType;                ///< Negative Acknowledgement type
+};
+
+/**
+ * @brief Class for Interest parsing exception 
+ */
+class NdnInterestHeaderException {};
+
+} // namespace ns3
+
+#endif // _NDN_INTEREST_HEADER_H_