diff --git a/helper/ccnb-parser/visitors/interest-visitor.cc b/helper/ccnb-parser/visitors/interest-visitor.cc
new file mode 100644
index 0000000..175eaad
--- /dev/null
+++ b/helper/ccnb-parser/visitors/interest-visitor.cc
@@ -0,0 +1,188 @@
+/* -*- 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "interest-visitor.h"
+
+#include "../syntax-tree/block.h"
+#include "../syntax-tree/dtag.h"
+
+#include "ns3/ndn-name-components.h"
+#include "ns3/ndn-interest-header.h"
+
+#include "ns3/assert.h"
+#include "ns3/nstime.h"
+
+#include "name-components-visitor.h"
+#include "non-negative-integer-visitor.h"
+#include "timestamp-visitor.h"
+#include "uint32t-blob-visitor.h"
+
+#include <boost/foreach.hpp>
+
+#include "ns3/log.h"
+
+NS_LOG_COMPONENT_DEFINE ("ndn.CcnbParser.InterestVisitor");
+
+namespace ns3 {
+namespace ndn {
+namespace CcnbParser {
+
+// We don't care about any other fields
+void
+InterestVisitor::visit (Dtag &n, boost::any param/*should be InterestHeader* */)
+{
+  // uint32_t n.m_dtag;
+  // std::list<Ptr<Block> > n.m_nestedBlocks;
+
+  static NonNegativeIntegerVisitor nonNegativeIntegerVisitor;
+  static NameComponentsVisitor     nameComponentsVisitor;
+  static TimestampVisitor          timestampVisitor;
+  static Uint32tBlobVisitor        nonceVisitor;
+  
+  InterestHeader &interest = *(boost::any_cast<InterestHeader*> (param));
+
+  switch (n.m_dtag)
+    {
+    case CCN_DTAG_Interest:
+      NS_LOG_DEBUG ("Interest");
+  
+      // process nested blocks
+      BOOST_FOREACH (Ptr<Block> block, n.m_nestedTags)
+        {
+          block->accept (*this, param);
+        }
+      break;
+    case CCN_DTAG_Name:
+      {
+        NS_LOG_DEBUG ("Name");
+
+        // process name components
+        Ptr<NameComponents> name = Create<NameComponents> ();
+        
+        BOOST_FOREACH (Ptr<Block> block, n.m_nestedTags)
+          {
+            block->accept (nameComponentsVisitor, &(*name));
+          }
+        interest.SetName (name);
+        break;
+      }
+    case CCN_DTAG_MinSuffixComponents:
+      NS_LOG_DEBUG ("MinSuffixComponents");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+      interest.SetMinSuffixComponents (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_MaxSuffixComponents:
+      NS_LOG_DEBUG ("MaxSuffixComponents");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+      interest.SetMaxSuffixComponents (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_Exclude:
+      {
+        NS_LOG_DEBUG ("Exclude");
+        // process exclude components
+        Ptr<NameComponents> exclude = Create<NameComponents> ();
+        
+        BOOST_FOREACH (Ptr<Block> block, n.m_nestedTags)
+          {
+            block->accept (nameComponentsVisitor, &(*exclude));
+          }
+        interest.SetExclude (exclude);
+        break;
+      }
+    case CCN_DTAG_ChildSelector:
+      NS_LOG_DEBUG ("ChildSelector");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+
+      interest.SetChildSelector (
+               1 == boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_AnswerOriginKind:
+      NS_LOG_DEBUG ("AnswerOriginKind");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+      interest.SetAnswerOriginKind (
+               1 == boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_Scope: 
+      NS_LOG_DEBUG ("Scope");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+      interest.SetScope (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_InterestLifetime:
+      NS_LOG_DEBUG ("InterestLifetime");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+
+      interest.SetInterestLifetime (
+               boost::any_cast<Time> (
+                                      (*n.m_nestedTags.begin())->accept(
+                                                                        timestampVisitor
+                                                                        )));
+      break;
+    case CCN_DTAG_Nonce:
+      NS_LOG_DEBUG ("Nonce");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+
+      interest.SetNonce (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(
+                                                                           nonceVisitor
+                                                                           )));
+      break;
+    
+            
+    case CCN_DTAG_Nack:
+      NS_LOG_DEBUG ("Nack");
+      if (n.m_nestedTags.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnbDecodingException ();
+            
+      interest.SetNack (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedTags.begin())->accept(nonNegativeIntegerVisitor)));
+      break;
+    }
+}
+
+} // namespace CcnbParser
+} // namespace ndn
+} // namespace ns3