diff --git a/helper/tracers/ipv4-app-tracer.h b/helper/tracers/ipv4-app-tracer.h
new file mode 100644
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+++ b/helper/tracers/ipv4-app-tracer.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012 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 IPV4_APP_TRACER_H
+#define IPV4_APP_TRACER_H
+
+#include "ns3/ptr.h"
+#include "ns3/simple-ref-count.h"
+#include "ns3/ipv4.h"
+
+namespace ns3 {
+
+class Ipv4Header;
+
+class Ipv4AppTracer : public SimpleRefCount<Ipv4AppTracer>
+{
+public:
+  Ipv4AppTracer (Ptr<Node> node, const std::string &appId = "*");
+  virtual ~Ipv4AppTracer ()  { };
+
+  void
+  Connect ();
+
+  virtual void
+  PrintHeader (std::ostream &os) const = 0;
+  
+  virtual void
+  Print (std::ostream &os) const = 0;
+
+  virtual void
+  Rx (std::string context,
+      const Ipv4Header &, Ptr<const Packet>, uint32_t) = 0;
+  
+  virtual void
+  Tx (std::string context,
+      const Ipv4Header &, Ptr<const Packet>, uint32_t) = 0;
+  
+protected:
+  std::string m_app;
+  std::string m_appId;
+  std::string m_node;
+  Ptr<Node> m_nodePtr;
+};
+
+inline std::ostream&
+operator << (std::ostream &os, const Ipv4AppTracer &tracer)
+{
+  os << "# ";
+  tracer.PrintHeader (os);
+  os << "\n";
+  tracer.Print (os);
+  return os;
+}
+
+} // namespace ns3
+
+#endif // IPV4_APP_TRACER_H