diff --git a/helper/ccnb-parser/visitors/ccnb-parser-interest-visitor.cc b/helper/ccnb-parser/visitors/ccnb-parser-interest-visitor.cc
new file mode 100644
index 0000000..d33b2b0
--- /dev/null
+++ b/helper/ccnb-parser/visitors/ccnb-parser-interest-visitor.cc
@@ -0,0 +1,133 @@
+/* -*- 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 "ccnb-parser-interest-visitor.h"
+
+namespace ns3 {
+namespace CcnbParser {
+
+// We don't care about any other fields
+void
+InterestVisitor::visit (Dtag &n, boost::any param/*should be CcnxInterestHeader&*/)
+{
+  // uint32_t n.m_dtag;
+  // std::list<Ptr<Block> > n.m_nestedBlocks;
+
+  static NonNegativeIntegerVisitor nonNegativeIntegerVisitor;
+  static NameComponentsVisitor     m_nameComponentsVisitor;
+  
+  CcnxInterestHeader &interest = boost::any_cast<CcnxInterestHeader&> (param);
+  
+  switch (n.m_dtag)
+    {
+    case CCN_DTAG_Interest:
+      // process nested blocks
+      BOOST_FOREACH (Ptr<Block> block, n.m_nestedBlocks)
+        {
+          block->accept (*this, param);
+        }
+      break;
+    case CCN_DTAG_Name:
+      {
+        // process name components
+        Ptr<Name::Components> name = Create<Name::Components> ();
+        
+        BOOST_FOREACH (Ptr<Block> block, n.m_nestedBlocks)
+          {
+            block->accept (nameComponentsVisitor, *name);
+          }
+        interest.SetName (name);
+        break;
+      }
+    case CCN_DTAG_MinSuffixComponents:
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+      interest.SetMinSuffixComponents (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedBlocks.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_MaxSuffixComponents:
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+      interest.SetMaxSuffixComponents (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedBlocks.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_Exclude:
+      {
+        // process exclude components
+        Ptr<Name::Components> exclude = Create<Name::Components> ();
+        
+        BOOST_FOREACH (Ptr<Block> block, n.m_nestedBlocks)
+          {
+            block->accept (nameComponentsVisitor, *exclude);
+          }
+        interest.SetExclude (exclude);
+        break;
+      }
+    case CCN_DTAG_ChildSelector:
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+
+      interest.SetChildSelector (
+               1 == boost::any_cast<uint32_t> (
+                                          (*n.m_nestedBlocks.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_AnswerOriginKind:
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+      interest.SetAnswerOriginKind (
+               1 == boost::any_cast<uint32_t> (
+                                          (*n.m_nestedBlocks.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_Scope: 
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+      interest.SetScope (
+               boost::any_cast<uint32_t> (
+                                          (*n.m_nestedBlocks.begin())->accept(
+                                                                           nonNegativeIntegerVisitor
+                                                                           )));
+      break;
+    case CCN_DTAG_InterestLifetime:
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+
+      /// \todo Decode InterestLifetime
+      break;
+    case CCN_DTAG_Nonce:
+      if (n.m_nestedBlocks.size()!=1) // should be exactly one UDATA inside this tag
+        throw CcnxDecodingException ();
+
+      /// \todo Decode Nonce
+      break;
+    }
+}
+
+} // namespace CcnbParser
+} // namespace ns3