--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tutorial/tutorial-csma-echo-ascii-trace.cc	Tue Oct 02 15:34:00 2007 -0700
@@ -0,0 +1,86 @@
+/* -*- 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
+ */
+
+#include "ns3/log.h"
+#include "ns3/ptr.h"
+#include "ns3/internet-node.h"
+#include "ns3/csma-channel.h"
+#include "ns3/mac48-address.h"
+#include "ns3/csma-net-device.h"
+#include "ns3/csma-topology.h"
+#include "ns3/csma-ipv4-topology.h"
+#include "ns3/udp-echo-client.h"
+#include "ns3/udp-echo-server.h"
+#include "ns3/simulator.h"
+#include "ns3/nstime.h"
+#include "ns3/ascii-trace.h"
+
+NS_LOG_COMPONENT_DEFINE ("UdpEchoSimulation");
+
+using namespace ns3;
+
+int 
+main (int argc, char *argv[])
+{
+  LogComponentEnable ("UdpEchoSimulation", LOG_LEVEL_INFO);
+
+  NS_LOG_INFO ("UDP Echo Simulation");
+
+  Ptr<Node> n0 = Create<InternetNode> ();
+  Ptr<Node> n1 = Create<InternetNode> ();
+  Ptr<Node> n2 = Create<InternetNode> ();
+  Ptr<Node> n3 = Create<InternetNode> ();
+
+  Ptr<CsmaChannel> lan = 
+    CsmaTopology::CreateCsmaChannel (DataRate (5000000), MilliSeconds (2));
+
+  uint32_t nd0 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n0, lan, 
+    "08:00:2e:00:00:00");
+
+  uint32_t nd1 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n1, lan, 
+    "08:00:2e:00:00:01");
+
+  uint32_t nd2 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n2, lan, 
+    "08:00:2e:00:00:02");
+
+  uint32_t nd3 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n3, lan, 
+    "08:00:2e:00:00:03");
+
+  CsmaIpv4Topology::AddIpv4Address (n0, nd0, "10.1.1.1", "255.255.255.0");
+  CsmaIpv4Topology::AddIpv4Address (n1, nd1, "10.1.1.2", "255.255.255.0");
+  CsmaIpv4Topology::AddIpv4Address (n2, nd2, "10.1.1.3", "255.255.255.0");
+  CsmaIpv4Topology::AddIpv4Address (n3, nd3, "10.1.1.4", "255.255.255.0");
+
+  uint16_t port = 7;
+
+  Ptr<UdpEchoClient> client = Create<UdpEchoClient> (n0, "10.1.1.2", port, 
+    1, Seconds(1.), 1024);
+
+  Ptr<UdpEchoServer> server = Create<UdpEchoServer> (n1, port);
+
+  server->Start(Seconds(1.));
+  client->Start(Seconds(2.));
+
+  server->Stop (Seconds(10.));
+  client->Stop (Seconds(10.));
+
+  AsciiTrace asciitrace ("tutorial.tr");
+  asciitrace.TraceAllQueues ();
+  asciitrace.TraceAllNetDeviceRx ();
+
+  Simulator::Run ();
+  Simulator::Destroy ();
+}