--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/csma-ping.cc	Wed Oct 29 11:19:01 2008 -0700
@@ -0,0 +1,140 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * 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
+ */
+
+// Port of ns-2/tcl/ex/simple.tcl to ns-3
+//
+// Network topology
+//
+//       n0    n1   n2   n3
+//       |     |    |    |
+//     =====================
+//
+// - CBR/UDP flows from n0 to n1, and from n3 to n0
+// - UDP packet size of 210 bytes, with per-packet interval 0.00375 sec.
+//   (i.e., DataRate of 448,000 bps)
+// - DropTail queues 
+// - Tracing of queues and packet receptions to file "csma-one-subnet.tr"
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <cassert>
+
+#include "ns3/core-module.h"
+#include "ns3/simulator-module.h"
+#include "ns3/node-module.h"
+#include "ns3/helper-module.h"
+#include "ns3/global-route-manager.h"
+
+using namespace ns3;
+
+NS_LOG_COMPONENT_DEFINE ("CsmaPingExample");
+
+static void SinkRx (Ptr<const Packet> p, const Address &ad)
+{
+  //std::cout << *p << std::endl;
+}
+
+static void PingRtt (std::string context, Time rtt)
+{
+  //std::cout << context << " " << rtt << std::endl;
+}
+
+int
+main (int argc, char *argv[])
+{
+  //
+  // Make the random number generators generate reproducible results.
+  //
+  RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);
+
+  CommandLine cmd;
+  cmd.Parse (argc, argv);
+
+  // Here, we will explicitly create four nodes.
+  NS_LOG_INFO ("Create nodes.");
+  NodeContainer c;
+  c.Create (4);
+
+  // connect all our nodes to a shared channel.
+  NS_LOG_INFO ("Build Topology.");
+  CsmaHelper csma;
+  csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate (5000000)));
+  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
+  csma.SetDeviceAttribute ("EncapsulationMode", StringValue ("Llc"));
+  NetDeviceContainer devs = csma.Install (c);
+
+  // add an ip stack to all nodes.
+  NS_LOG_INFO ("Add ip stack.");
+  InternetStackHelper ipStack;
+  ipStack.Install (c);
+
+  // assign ip addresses
+  NS_LOG_INFO ("Assign ip addresses.");
+  Ipv4AddressHelper ip;
+  ip.SetBase ("192.168.1.0", "255.255.255.0");
+  Ipv4InterfaceContainer addresses = ip.Assign (devs);
+
+  // setup global router
+  GlobalRouteManager::PopulateRoutingTables ();
+  NS_LOG_INFO ("Create Source");
+  Config::SetDefault ("ns3::Ipv4RawSocketImpl::Protocol", StringValue ("2"));
+  InetSocketAddress dst = InetSocketAddress (addresses.GetAddress (3));
+  OnOffHelper onoff = OnOffHelper ("ns3::Ipv4RawSocketFactory", dst);
+  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1.0)));
+  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0.0)));
+  onoff.SetAttribute ("DataRate", DataRateValue (DataRate (15000)));
+  onoff.SetAttribute ("PacketSize", UintegerValue (1200));
+
+
+  ApplicationContainer apps = onoff.Install (c.Get (0));
+  apps.Start (Seconds (1.0));
+  apps.Stop (Seconds (10.0));
+
+  NS_LOG_INFO ("Create Sink.");
+  PacketSinkHelper sink = PacketSinkHelper ("ns3::Ipv4RawSocketFactory", dst);
+  apps = sink.Install (c.Get (3));
+  apps.Start (Seconds (0.0));
+  apps.Stop (Seconds (11.0));
+
+  NS_LOG_INFO ("Create pinger");
+  V4PingHelper ping = V4PingHelper (addresses.GetAddress (2));
+  NodeContainer pingers;
+  pingers.Add (c.Get (0));
+  pingers.Add (c.Get (1));
+  pingers.Add (c.Get (3));
+  apps = ping.Install (pingers);
+  apps.Start (Seconds (2.0));
+  apps.Stop (Seconds (5.0));
+
+  NS_LOG_INFO ("Configure Tracing.");
+  // first, pcap tracing.
+  csma.EnablePcapAll ("csma-ping");
+  // then, print what the packet sink receives.
+  Config::ConnectWithoutContext ("/NodeList/3/ApplicationList/0/$ns3::PacketSink/Rx", 
+                                 MakeCallback (&SinkRx));
+  // finally, print the ping rtts.
+  Config::Connect ("/NodeList/*/ApplicationList/*/$ns3::V4Ping/Rtt",
+                   MakeCallback (&PingRtt));
+
+  Packet::EnablePrinting ();
+  
+
+  NS_LOG_INFO ("Run Simulation.");
+  Simulator::Run ();
+  Simulator::Destroy ();
+  NS_LOG_INFO ("Done.");
+}