--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/tap/lxc-left.conf	Wed Feb 17 21:49:22 2010 -0800
@@ -0,0 +1,7 @@
+# Container with network virtualized using a pre-configured bridge named br0 and
+# veth pair virtual network devices
+lxc.utsname = left
+lxc.network.type = veth
+lxc.network.flags = up
+lxc.network.link = br-left
+lxc.network.ipv4 = 10.0.2.100/24

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/tap/lxc-right.conf	Wed Feb 17 21:49:22 2010 -0800
@@ -0,0 +1,7 @@
+# Container with network virtualized using a pre-configured bridge named br0 and
+# veth pair virtual network devices
+lxc.utsname = right
+lxc.network.type = veth
+lxc.network.flags = up
+lxc.network.link = br-right
+lxc.network.ipv4 = 10.0.2.101/24

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/tap/tap-csma-virtual-machine.cc	Wed Feb 17 21:49:22 2010 -0800
@@ -0,0 +1,115 @@
+/* -*- 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
+ */
+
+//
+// This is an illustration of how one could use virtualization techniques to
+// allow running applications on virtual machines talking over simulated
+// networks.
+//
+// The actual steps required to configure the virtual machines can be rather
+// involved, so we don't go into that here.  Please have a look at one of
+// our HOWTOs on the nsnam wiki for more details about how to get the 
+// system confgured.  For an example, have a look at "HOWTO Use Linux 
+// Containers to set up virtual networks" which uses this code as an 
+// example.
+//
+// The configuration you are after is explained in great detail in the 
+// HOWTO, but looks like the following:
+//
+//  +----------+                           +----------+
+//  | virtual  |                           | virtual  |
+//  |  Linux   |                           |  Linux   |
+//  |   Host   |                           |   Host   |
+//  |          |                           |          |
+//  |   eth0   |                           |   eth0   |
+//  +----------+                           +----------+
+//       |                                      |
+//  +----------+                           +----------+
+//  |  Linux   |                           |  Linux   |
+//  |  Bridge  |                           |  Bridge  |
+//  +----------+                           +----------+
+//       |                                      |
+//  +------------+                       +-------------+
+//  | "tap-left" |                       | "tap-right" |
+//  +------------+                       +-------------+
+//       |           n0            n1           |
+//       |       +--------+    +--------+       |
+//       +-------|  tap   |    |  tap   |-------+
+//               | bridge |    | bridge |
+//               +--------+    +--------+
+//               |  CSMA  |    |  CSMA  |
+//               +--------+    +--------+
+//                   |             |     
+//                   |             |     
+//                   |             |     
+//                   ===============
+//                   CSMA LAN 10.0.0
+//
+// The CSMA device on node zero is:  10.0.0.1
+// The CSMA device on node one is:   10.0.0.2
+//
+#include <iostream>
+#include <fstream>
+
+#include "ns3/simulator-module.h"
+#include "ns3/node-module.h"
+#include "ns3/core-module.h"
+#include "ns3/wifi-module.h"
+#include "ns3/helper-module.h"
+
+using namespace ns3;
+
+NS_LOG_COMPONENT_DEFINE ("TapCsmaVirtualMachineExample");
+
+int 
+main (int argc, char *argv[])
+{
+  CommandLine cmd;
+  cmd.Parse (argc, argv);
+
+  GlobalValue::Bind ("SimulatorImplementationType", StringValue ("ns3::RealtimeSimulatorImpl"));
+  GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));
+
+  NodeContainer nodes;
+  nodes.Create (2);
+
+  CsmaHelper csma;
+  csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
+  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
+
+  NetDeviceContainer devices = csma.Install (nodes);
+
+  InternetStackHelper stack;
+  stack.Install (nodes);
+
+  Ipv4AddressHelper addresses;
+  addresses.SetBase ("10.0.2.0", "255.255.255.0", "0.0.0.100");
+  Ipv4InterfaceContainer interfaces = addresses.Assign (devices);
+
+  TapBridgeHelper tapBridge;
+  tapBridge.SetAttribute ("Mode", StringValue ("UseBridge"));
+  tapBridge.SetAttribute ("DeviceName", StringValue ("tap-left"));
+  tapBridge.Install (nodes.Get (0), devices.Get (0));
+
+  tapBridge.SetAttribute ("DeviceName", StringValue ("tap-right"));
+  tapBridge.Install (nodes.Get (1), devices.Get (1));
+
+  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
+
+  Simulator::Stop (Seconds (600.));
+  Simulator::Run ();
+  Simulator::Destroy ();
+}

--- a/examples/tap/wscript	Mon Feb 08 22:45:39 2010 -0800
+++ b/examples/tap/wscript	Wed Feb 17 21:49:22 2010 -0800
@@ -5,5 +5,7 @@
     if env['ENABLE_TAP']:
         obj = bld.create_ns3_program('tap-csma', ['csma', 'tap-bridge', 'internet-stack'])
         obj.source = 'tap-csma.cc'
+        obj = bld.create_ns3_program('tap-csma-virtual-machine', ['csma', 'tap-bridge', 'internet-stack'])
+        obj.source = 'tap-csma-virtual-machine.cc'
         obj = bld.create_ns3_program('tap-wifi-dumbbell', ['wifi', 'csma', 'point-to-point', 'tap-bridge', 'internet-stack'])
         obj.source = 'tap-wifi-dumbbell.cc'