diff --git a/helper/ccnx-trace-helper.cc b/helper/ccnx-trace-helper.cc
index 0e958fa..bb53be9 100644
--- a/helper/ccnx-trace-helper.cc
+++ b/helper/ccnx-trace-helper.cc
@@ -41,6 +41,7 @@
 #include "tracers/ccnx-aggregate-l3-tracer.h"
 #include "tracers/ccnx-rate-l3-tracer.h"
 #include "tracers/ccnx-seqs-app-tracer.h"
+#include "tracers/ipv4-rate-l3-tracer.h"
 #include "tracers/ipv4-seqs-app-tracer.h"
 #include "tracers/ccnx-consumer-window-tracer.h"
 #include "tracers/ccnx-path-weight-tracer.h"
@@ -76,6 +77,7 @@
   if (m_windowsTrace != 0) delete m_windowsTrace;
   if (m_windowsTcpTrace != 0) delete m_windowsTcpTrace;
   if (m_pathWeightsTrace != 0) delete m_pathWeightsTrace;
+  if (m_ipv4RateTrace != 0) delete m_ipv4RateTrace;
   
   if (m_apps.size () > 0)
     {
@@ -203,7 +205,7 @@
       NS_LOG_DEBUG ("Node: " << lexical_cast<string> ((*node)->GetId ()));
 
       Ptr<CcnxRateL3Tracer> trace = Create<CcnxRateL3Tracer> (boost::ref(*m_l3RateTrace), *node);
-      trace->SetAveragingPeriod (Seconds (0.5));
+      trace->SetAveragingPeriod (Seconds (0.2));
       m_l3Rates.push_back (trace);
     }
 
@@ -216,6 +218,32 @@
 }
 
 void
+CcnxTraceHelper::EnableIpv4RateL3All (const std::string &file)
+{
+  NS_LOG_FUNCTION (this);
+  m_ipv4RateTrace = new ofstream (file.c_str (), ios::trunc);
+
+  for (NodeList::Iterator node = NodeList::Begin ();
+       node != NodeList::End ();
+       node++)
+    {
+      NS_LOG_DEBUG ("Node: " << lexical_cast<string> ((*node)->GetId ()));
+
+      Ptr<Ipv4RateL3Tracer> trace = Create<Ipv4RateL3Tracer> (boost::ref(*m_ipv4RateTrace), *node);
+      trace->SetAveragingPeriod (Seconds (0.2));
+      m_ipv4Rates.push_back (trace);
+    }
+
+  if (m_ipv4Rates.size () > 0)
+    {
+      // *m_ipv4RateTrace << "# "; // not necessary for R's read.table
+      m_ipv4Rates.front ()->PrintHeader (*m_ipv4RateTrace);
+      *m_ipv4RateTrace << "\n";
+    }
+}
+
+
+void
 CcnxTraceHelper::EnableSeqsAppAll (const std::string &appName, const std::string &trace)
 {
   NS_LOG_FUNCTION (this);
diff --git a/helper/ccnx-trace-helper.h b/helper/ccnx-trace-helper.h
index 59f0a53..aa9cd30 100644
--- a/helper/ccnx-trace-helper.h
+++ b/helper/ccnx-trace-helper.h
@@ -31,6 +31,7 @@
 class Node;
 class CcnxAppTracer;
 class CcnxL3Tracer;
+class Ipv4L3Tracer;
 class Ipv4AppTracer;
 class WindowTracer;
 class CcnxPathWeightTracer;
@@ -99,6 +100,12 @@
   EnableIpv4SeqsAppAll (const std::string &appSeqsTrace = "app-seqs.log");
 
   /**
+   * @brief Enable network-level IPv4 rate tracing on all IPv4-enabled nodes
+   */
+  void
+  EnableIpv4RateL3All (const std::string &ipv4RateTrace = "ipv4-rate.log");
+
+  /**
    * @brief Enable tracing of window changes in CcnxConsumerWindow
    */
   void
@@ -136,6 +143,9 @@
   std::list<Ptr<CcnxAppTracer> > m_appSeqs;
   std::ostream *m_appSeqsTrace;
 
+  std::list<Ptr<Ipv4L3Tracer> > m_ipv4Rates;
+  std::ostream *m_ipv4RateTrace;
+
   std::list<Ptr<Ipv4AppTracer> > m_ipv4AppSeqs;
   std::ostream *m_ipv4AppSeqsTrace;
 
diff --git a/helper/tracers/ipv4-l3-tracer.cc b/helper/tracers/ipv4-l3-tracer.cc
new file mode 100644
index 0000000..ed2cb9c
--- /dev/null
+++ b/helper/tracers/ipv4-l3-tracer.cc
@@ -0,0 +1,61 @@
+/* -*- 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>
+ */
+
+#include "ipv4-l3-tracer.h"
+#include "ns3/node.h"
+#include "ns3/packet.h"
+#include "ns3/config.h"
+#include "ns3/names.h"
+#include "ns3/callback.h"
+#include "ns3/ccnx-app.h"
+#include "ns3/ccnx-face.h"
+
+#include <boost/lexical_cast.hpp>
+
+using namespace std;
+
+namespace ns3 {
+    
+Ipv4L3Tracer::Ipv4L3Tracer (Ptr<Node> node)
+: m_nodePtr (node)
+{
+  m_node = boost::lexical_cast<string> (m_nodePtr->GetId ());
+
+  Connect ();
+
+  string name = Names::FindName (node);
+  if (!name.empty ())
+    {
+      m_node = name;
+    }
+}
+
+void
+Ipv4L3Tracer::Connect ()
+{
+  Config::Connect ("/NodeList/"+m_node+"/$ns3::Ipv4L3Protocol/Tx",
+                   MakeCallback (&Ipv4L3Tracer::Tx, this));
+  Config::Connect ("/NodeList/"+m_node+"/$ns3::Ipv4L3Protocol/Rx",
+                   MakeCallback (&Ipv4L3Tracer::Rx, this));
+  Config::Connect ("/NodeList/"+m_node+"/$ns3::Ipv4L3Protocol/Drop",
+                   MakeCallback (&Ipv4L3Tracer::Drop, this));
+}
+
+} // namespace ns3
diff --git a/helper/tracers/ipv4-l3-tracer.h b/helper/tracers/ipv4-l3-tracer.h
new file mode 100644
index 0000000..e5f3c74
--- /dev/null
+++ b/helper/tracers/ipv4-l3-tracer.h
@@ -0,0 +1,90 @@
+/* -*- 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 IPV4_L3_TRACER_H
+#define IPV4_L3_TRACER_H
+
+#include "ns3/ptr.h"
+#include "ns3/simple-ref-count.h"
+#include "ns3/ipv4-l3-protocol.h"
+
+namespace ns3 {
+
+class Node;
+
+class Ipv4L3Tracer : public SimpleRefCount<Ipv4L3Tracer>
+{
+public:
+  Ipv4L3Tracer (Ptr<Node> node);
+  virtual ~Ipv4L3Tracer () { };
+
+  void
+  Connect ();
+  
+  virtual void
+  PrintHeader (std::ostream &os) const = 0;
+
+  virtual void
+  Print (std::ostream &os) const = 0;
+  
+  virtual void
+  Rx  (std::string context,
+       Ptr<const Packet>, Ptr<Ipv4>,  uint32_t) = 0;
+
+  virtual void
+  Tx   (std::string context,
+        Ptr<const Packet>, Ptr<Ipv4>,  uint32_t) = 0;
+
+  virtual void
+  Drop (std::string context,
+        const Ipv4Header &, Ptr<const Packet>, Ipv4L3Protocol::DropReason, Ptr<Ipv4>, uint32_t) = 0;
+
+protected:
+  std::string m_node;
+  Ptr<Node> m_nodePtr;
+
+  struct Stats
+  {
+    void Reset ()
+    {
+      m_in = 0;
+      m_out = 0;
+      m_drop = 0;
+    }
+    
+    uint64_t m_in;
+    uint64_t m_out;
+    uint64_t m_drop;
+  };
+};
+
+inline std::ostream&
+operator << (std::ostream &os, const Ipv4L3Tracer &tracer)
+{
+  os << "# ";
+  tracer.PrintHeader (os);
+  os << "\n";
+  tracer.Print (os);
+  return os;
+}
+
+} // namespace ns3
+
+#endif // IPV4_L3_TRACER_H
diff --git a/helper/tracers/ipv4-rate-l3-tracer.cc b/helper/tracers/ipv4-rate-l3-tracer.cc
new file mode 100644
index 0000000..e97ba18
--- /dev/null
+++ b/helper/tracers/ipv4-rate-l3-tracer.cc
@@ -0,0 +1,142 @@
+/* -*- 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>
+ */
+
+#include "ipv4-rate-l3-tracer.h"
+#include "ns3/node.h"
+#include "ns3/packet.h"
+#include "ns3/config.h"
+#include "ns3/callback.h"
+#include "ns3/simulator.h"
+
+#include "ns3/ipv4-header.h"
+
+namespace ns3 {
+    
+Ipv4RateL3Tracer::Ipv4RateL3Tracer (std::ostream &os, Ptr<Node> node)
+  : Ipv4L3Tracer (node)
+  , m_os (os)
+{
+  SetAveragingPeriod (Seconds (1.0));
+}
+
+Ipv4RateL3Tracer::~Ipv4RateL3Tracer ()
+{
+  m_printEvent.Cancel ();
+}
+
+void
+Ipv4RateL3Tracer::SetAveragingPeriod (const Time &period)
+{
+  m_period = period;
+  m_printEvent.Cancel ();
+  m_printEvent = Simulator::Schedule (m_period, &Ipv4RateL3Tracer::PeriodicPrinter, this);
+}
+
+void
+Ipv4RateL3Tracer::PeriodicPrinter ()
+{
+  Print (m_os);
+  Reset ();
+  
+  m_printEvent = Simulator::Schedule (m_period, &Ipv4RateL3Tracer::PeriodicPrinter, this);
+}
+
+void
+Ipv4RateL3Tracer::PrintHeader (std::ostream &os) const
+{
+  os << "Time" << "\t"
+
+     << "Node" << "\t"
+     << "Interface" << "\t"
+
+     << "Type" << "\t"
+     << "Packets" << "\t"
+     << "Kilobytes";
+}
+
+void
+Ipv4RateL3Tracer::Reset ()
+{
+  for (std::map<uint32_t, boost::tuple<Stats, Stats, Stats, Stats> >::iterator stats = m_stats.begin ();
+       stats != m_stats.end ();
+       stats++)
+    {
+      stats->second.get<0> ().Reset ();
+      stats->second.get<1> ().Reset ();
+    }
+}
+
+const double alpha = 0.8;
+
+#define STATS(INDEX) stats->second.get<INDEX> ()
+#define RATE(INDEX, fieldName) STATS(INDEX).fieldName / m_period.ToDouble (Time::S)
+
+#define PRINTER(printName, fieldName) \
+STATS(2).fieldName = /*new value*/alpha * RATE(0, fieldName) + /*old value*/(1-alpha) * STATS(2).fieldName; \
+STATS(3).fieldName = /*new value*/alpha * RATE(1, fieldName) / 1024.0 + /*old value*/(1-alpha) * STATS(3).fieldName; \
+                                                                        \
+os << time.ToDouble (Time::S) << "\t"                                   \
+ << m_node << "\t"                                                      \
+ << stats->first << "\t"                                      \
+ << printName << "\t"                                                   \
+ << STATS(2).fieldName  << "\t"                                        \
+ << STATS(3).fieldName << "\n";
+
+void
+Ipv4RateL3Tracer::Print (std::ostream &os) const
+{
+  for (std::map<uint32_t, boost::tuple<Stats, Stats, Stats, Stats> >::iterator stats = m_stats.begin ();
+       stats != m_stats.end ();
+       stats++)
+    {
+      Time time = Simulator::Now ();
+
+      PRINTER ("In",   m_in);
+      PRINTER ("Out",  m_out);
+      PRINTER ("Drop", m_drop);
+    }
+}
+
+void
+Ipv4RateL3Tracer::Rx  (std::string context,
+                       Ptr<const Packet> packet, Ptr<Ipv4> ipv4,  uint32_t iface)
+{
+  m_stats[iface].get<0> ().m_in ++;
+  m_stats[iface].get<1> ().m_in += packet->GetSize ();
+}
+
+void
+Ipv4RateL3Tracer::Tx   (std::string context,
+                        Ptr<const Packet> packet, Ptr<Ipv4> ipv4,  uint32_t iface)
+{
+  m_stats[iface].get<0> ().m_out ++;
+  m_stats[iface].get<1> ().m_out += packet->GetSize ();
+}
+
+void
+Ipv4RateL3Tracer::Drop (std::string context,
+                        const Ipv4Header &header, Ptr<const Packet> packet, Ipv4L3Protocol::DropReason, Ptr<Ipv4> ipv4, uint32_t iface)
+{
+  m_stats[iface].get<0> ().m_drop ++;
+  m_stats[iface].get<1> ().m_drop += packet->GetSize ();
+}
+
+
+} // namespace ns3
diff --git a/helper/tracers/ipv4-rate-l3-tracer.h b/helper/tracers/ipv4-rate-l3-tracer.h
new file mode 100644
index 0000000..454ac14
--- /dev/null
+++ b/helper/tracers/ipv4-rate-l3-tracer.h
@@ -0,0 +1,85 @@
+/* -*- 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 IPV4_RATE_L3_TRACER_H
+#define IPV4_RATE_L3_TRACER_H
+
+#include "ipv4-l3-tracer.h"
+
+#include "ns3/nstime.h"
+#include "ns3/event-id.h"
+
+#include <boost/tuple/tuple.hpp>
+#include <map>
+
+namespace ns3 {
+
+/**
+ * @ingroup ccnx
+ * @brief CCNx network-layer rate tracer
+ */
+class Ipv4RateL3Tracer : public Ipv4L3Tracer
+{
+public:
+  /**
+   * @brief Network layer tracer constructor
+   */
+  Ipv4RateL3Tracer (std::ostream &os, Ptr<Node> node);
+  virtual ~Ipv4RateL3Tracer ();
+
+  void
+  SetAveragingPeriod (const Time &period);
+  
+  virtual void
+  PrintHeader (std::ostream &os) const;
+
+  virtual void
+  Print (std::ostream &os) const;
+
+  virtual void
+  Rx  (std::string context,
+       Ptr<const Packet>, Ptr<Ipv4>,  uint32_t);
+
+  virtual void
+  Tx   (std::string context,
+        Ptr<const Packet>, Ptr<Ipv4>,  uint32_t);
+
+  virtual void
+  Drop (std::string context,
+        const Ipv4Header &, Ptr<const Packet>, Ipv4L3Protocol::DropReason, Ptr<Ipv4>, uint32_t);
+
+private:
+  void
+  PeriodicPrinter ();
+  
+  void
+  Reset ();
+
+private:
+  std::ostream& m_os;
+  Time m_period;
+  EventId m_printEvent;
+
+  mutable std::map<uint32_t, boost::tuple<Stats, Stats, Stats, Stats> > m_stats;
+};
+
+} // namespace ns3
+
+#endif // IPV4_RATE_L3_TRACER_H