diff --git a/helper/ccnx-trace-helper.h b/helper/ccnx-trace-helper.h
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+++ b/helper/ccnx-trace-helper.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 UCLA
+ *
+ * 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>
+ */
+
+#ifndef CCNX_TRACE_HELPER_H
+#define CCNX_TRACE_HELPER_H
+
+#include "ns3/ptr.h"
+#include "ns3/simple-ref-count.h"
+#include "ns3/ccnx.h"
+
+namespace ns3 {
+
+class CcnxApp;
+
+class CcnxAppTracer : public SimpleRefCount<CcnxAppTracer>
+{
+public:
+  CcnxAppTracer (const std::string &app, const std::string &node = "*", const std::string &appId = "*");
+  virtual ~CcnxAppTracer ()  { };
+
+  virtual void
+  PrintHeader (std::ostream &os) const = 0;
+  
+  virtual void
+  Print (std::ostream &os) const = 0;
+
+  virtual void
+  OutInterests (std::string context,
+                Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>) = 0;
+
+  virtual void
+  InInterests  (std::string context,
+                Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>) = 0;
+
+  virtual void
+  InNacks (std::string context,
+           Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>) = 0;
+
+  virtual void
+  OutData (std::string context,
+           Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>, Ptr<CcnxApp>, Ptr<CcnxFace>) = 0;
+  
+  virtual void
+  InData  (std::string context,
+           Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>, Ptr<CcnxApp>, Ptr<CcnxFace>) = 0;
+
+protected:
+  std::string m_app;
+  std::string m_appId;
+  std::string m_node;
+};
+
+std::ostream&
+operator << (std::ostream &os, const CcnxAppTracer &tracer)
+{
+  os << "# ";
+  tracer.PrintHeader (os);
+  os << "\n";
+  tracer.Print (os);
+  return os;
+}
+
+class CcnxL3Tracer : public SimpleRefCount<CcnxL3Tracer>
+{
+public:
+  CcnxL3Tracer (const std::string &node = "*");
+  virtual ~CcnxL3Tracer () { };
+
+  virtual void
+  PrintHeader (std::ostream &os) const = 0;
+
+  virtual void
+  Print (std::ostream &os) const = 0;
+  
+  virtual void
+  OutInterests  (std::string context,
+                 Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>) = 0;
+
+  virtual void
+  InInterests   (std::string context,
+                 Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>) = 0;
+
+  virtual void
+  DropInterests (std::string context,
+                 Ptr<const CcnxInterestHeader>, Ccnx::DropReason, Ptr<const CcnxFace>) = 0;
+  
+  virtual void
+  OutNacks  (std::string context,
+             Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>) = 0;
+
+  virtual void
+  InNacks   (std::string context,
+             Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>) = 0;
+
+  virtual void
+  DropNacks (std::string context,
+             Ptr<const CcnxInterestHeader>, Ccnx::DropReason, Ptr<const CcnxFace>) = 0;
+
+  
+  virtual void
+  OutData  (std::string context,
+            Ptr<const CcnxContentObjectHeader>, bool fromCache, Ptr<const CcnxFace>) = 0;
+
+  virtual void
+  InData   (std::string context,
+            Ptr<const CcnxContentObjectHeader>, Ptr<const CcnxFace>) = 0;
+
+  virtual void
+  DropData (std::string context,
+            Ptr<const CcnxContentObjectHeader>, Ccnx::DropReason, Ptr<const CcnxFace>) = 0;
+
+protected:
+  std::string m_node;
+};
+
+std::ostream&
+operator << (std::ostream &os, const CcnxL3Tracer &tracer)
+{
+  os << "# ";
+  tracer.PrintHeader (os);
+  os << "\n";
+  tracer.Print (os);
+  return os;
+}
+
+////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////
+
+class CcnxAggregateAppTracer : public CcnxAppTracer
+{
+public:
+  CcnxAggregateAppTracer (const std::string &app, const std::string &node = "*", const std::string &appId = "*");
+  virtual ~CcnxAggregateAppTracer () { };
+
+  virtual void
+  PrintHeader (std::ostream &os) const;
+
+  virtual void
+  Print (std::ostream &os) const;
+
+  virtual void
+  OutInterests (std::string context,
+                Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+  virtual void
+  InInterests  (std::string context,
+                Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+  virtual void
+  InNacks (std::string context,
+           Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+  virtual void
+  OutData (std::string context,
+           Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+  
+  virtual void
+  InData  (std::string context,
+           Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+private:
+  uint64_t m_inInterests;
+  uint64_t m_outInterests;
+  uint64_t m_inNacks;
+  uint64_t m_inData; 
+  uint64_t m_outData;
+};
+
+class CcnxAggregateL3Tracer : public CcnxL3Tracer
+{
+public:
+  CcnxAggregateL3Tracer (const std::string &node = "*");
+  virtual ~CcnxAggregateL3Tracer () { };
+  
+  virtual void
+  PrintHeader (std::ostream &os) const;
+
+  virtual void
+  Print (std::ostream &os) const;
+
+  virtual void
+  OutInterests  (std::string context,
+                 Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>);
+
+  virtual void
+  InInterests   (std::string context,
+                 Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>);
+
+  virtual void
+  DropInterests (std::string context,
+                 Ptr<const CcnxInterestHeader>, Ccnx::DropReason, Ptr<const CcnxFace>);
+  
+  virtual void
+  OutNacks  (std::string context,
+             Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>);
+
+  virtual void
+  InNacks   (std::string context,
+             Ptr<const CcnxInterestHeader>, Ptr<const CcnxFace>);
+
+  virtual void
+  DropNacks (std::string context,
+             Ptr<const CcnxInterestHeader>, Ccnx::DropReason, Ptr<const CcnxFace>);
+  
+  virtual void
+  OutData  (std::string context,
+            Ptr<const CcnxContentObjectHeader>, bool fromCache, Ptr<const CcnxFace>);
+
+  virtual void
+  InData   (std::string context,
+            Ptr<const CcnxContentObjectHeader>, Ptr<const CcnxFace>);
+
+  virtual void
+  DropData (std::string context,
+            Ptr<const CcnxContentObjectHeader>, Ccnx::DropReason, Ptr<const CcnxFace>);
+
+private:
+  uint64_t m_inInterests;
+  uint64_t m_outInterests;
+  uint64_t m_dropInterests;
+  uint64_t m_inNacks;
+  uint64_t m_outNacks;
+  uint64_t m_dropNacks;
+  uint64_t m_inData;
+  uint64_t m_outData;
+  uint64_t m_dropData;
+};
+
+class CcnxTraceHelper
+{
+public:
+  /**
+   * @brief Destructor that invokes trace output procedures
+   */
+  ~CcnxTraceHelper ();
+
+  /**
+   * @brief Set filename to output app trace.
+   *
+   * By default, trace is output to NS_LOG_INFO stream
+   *
+   * @param file File where trace will be written to
+   */
+  void
+  SetAppTraceFile (const std::string &appTrace = "apps.log");
+
+  /**
+   * @brief Set filename to output app trace.
+   *
+   * By default, trace is output to NS_LOG_INFO stream
+   *
+   * @param file File where trace will be written to
+   */
+  void
+  SetL3TraceFile (const std::string &l3Trace = "l3.log");
+  
+  /**
+   * @brief Enable aggregate app-level CCNx tracing on all CCNx applications (individual file per application)
+   *
+   * @param app  Class name of the application of interest
+   */
+  void
+  EnableAggregateAppAll (const std::string &app);
+
+  /**
+   * @brief Enable aggregate network-level CCNx tracing on all CCNx nodes (individual file per node)
+   */
+  void
+  EnableAggregateL3All ();
+
+private:
+  std::string m_appTrace;
+  std::list<Ptr<CcnxAggregateAppTracer> > m_apps;
+
+  std::string m_l3Trace;
+  std::list<Ptr<CcnxAggregateL3Tracer> > m_l3s;
+};
+
+
+} // namespace ns3
+
+#endif /* CCNX_TRACE_HELPER_H */