--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/socket/socket-options-ipv4.cc	Tue Nov 20 17:52:39 2012 -0500
@@ -0,0 +1,158 @@
+/* -*- 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
+ */
+
+// Network topology
+//
+//       n0              n1
+//       |               |
+//       =================
+//              LAN
+//
+// - UDP flows from n0 to n1
+
+#include <fstream>
+#include "ns3/core-module.h"
+#include "ns3/csma-module.h"
+#include "ns3/applications-module.h"
+#include "ns3/internet-module.h"
+#include "ns3/network-module.h"
+
+using namespace ns3;
+
+NS_LOG_COMPONENT_DEFINE ("SocketOptionsIpv4");
+
+void ReceivePacket (Ptr<Socket> socket)
+{
+  NS_LOG_INFO ("Received one packet!");
+  Ptr<Packet> packet = socket->Recv ();
+  SocketIpTosTag tosTag;
+  if (packet->RemovePacketTag (tosTag))
+    {
+      NS_LOG_INFO (" TOS = " << (uint32_t)tosTag.GetTos ());
+    }
+  SocketIpTtlTag ttlTag;
+  if (packet->RemovePacketTag (ttlTag))
+    {
+      NS_LOG_INFO (" TTL = " << (uint32_t)ttlTag.GetTtl ());
+    }
+}
+
+static void SendPacket (Ptr<Socket> socket, uint32_t pktSize, 
+                        uint32_t pktCount, Time pktInterval )
+{
+  if (pktCount > 0)
+    {
+      socket->Send (Create<Packet> (pktSize));
+      Simulator::Schedule (pktInterval, &SendPacket, 
+                           socket, pktSize,pktCount - 1, pktInterval);
+    }
+  else
+    {
+      socket->Close ();
+    }
+}
+
+int 
+main (int argc, char *argv[])
+{
+//
+// Allow the user to override any of the defaults and the above Bind() at
+// run-time, via command-line arguments
+//
+  uint32_t packetSize = 1024;
+  uint32_t packetCount = 10;
+  double packetInterval = 1.0;
+
+  //Socket options for IPv4, currently TOS, TTL, RECVTOS, and RECVTTL
+  uint32_t ipTos = 0;
+  bool ipRecvTos = true;
+  uint32_t ipTtl = 0;
+  bool ipRecvTtl = true;
+
+  CommandLine cmd;
+  cmd.AddValue ("PacketSize", "Packet size in bytes", packetSize);
+  cmd.AddValue ("PacketCount", "Number of packets to send", packetCount);
+  cmd.AddValue ("Interval", "Interval between packets", packetInterval);
+  cmd.AddValue ("IP_TOS", "IP_TOS", ipTos);
+  cmd.AddValue ("IP_RECVTOS", "IP_RECVTOS", ipRecvTos);
+  cmd.AddValue ("IP_TTL", "IP_TTL", ipTtl);
+  cmd.AddValue ("IP_RECVTTL", "IP_RECVTTL", ipRecvTtl);
+  cmd.Parse (argc, argv);
+
+  NS_LOG_INFO ("Create nodes.");
+  NodeContainer n;
+  n.Create (2);
+
+  InternetStackHelper internet;
+  internet.Install (n);
+
+  Address serverAddress;
+
+  NS_LOG_INFO ("Create channels.");
+  CsmaHelper csma;
+  csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate (5000000)));
+  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
+  csma.SetDeviceAttribute ("Mtu", UintegerValue (1400));
+  NetDeviceContainer d = csma.Install (n);
+
+
+  NS_LOG_INFO ("Assign IP Addresses.");
+  Ipv4AddressHelper ipv4;
+  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
+  Ipv4InterfaceContainer i = ipv4.Assign (d);
+  serverAddress = Address(i.GetAddress (1));
+   
+  NS_LOG_INFO ("Create sockets.");
+  //Receiver socket on n1
+  TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");
+  Ptr<Socket> recvSink = Socket::CreateSocket (n.Get (1), tid);
+  InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 4477);
+  recvSink->SetIpRecvTos (ipRecvTos);
+  recvSink->SetIpRecvTtl (ipRecvTtl);
+  recvSink->Bind (local);
+  recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));
+
+  //Sender socket on n0
+  Ptr<Socket> source = Socket::CreateSocket (n.Get (0), tid);
+  InetSocketAddress remote = InetSocketAddress (i.GetAddress (1), 4477);
+
+  //Set socket options, it is also possible to set the options after the socket has been created/connected.
+  if (ipTos > 0)
+    {
+      source->SetIpTos (ipTos);
+    }
+
+  if (ipTtl > 0)
+    {
+      source->SetIpTtl (ipTtl);
+    }
+  source->Connect (remote);
+
+  AsciiTraceHelper ascii;
+  csma.EnableAsciiAll (ascii.CreateFileStream ("socket-options-ipv4.tr"));
+  csma.EnablePcapAll ("socket-options-ipv4", false);
+
+  //Schedule SendPacket
+  Time interPacketInterval = Seconds (packetInterval);
+  Simulator::ScheduleWithContext (source->GetNode ()->GetId (),
+                                  Seconds (1.0), &SendPacket, 
+                                  source, packetSize, packetCount, interPacketInterval);
+
+  NS_LOG_INFO ("Run Simulation.");
+  Simulator::Run ();
+  Simulator::Destroy ();
+  NS_LOG_INFO ("Done.");
+}