Wireless Ad hoc with TCP over OLSR

[John Scott]

Hi Folks,

I wrote a script to simulate a wireless ad hoc network that uses OLSR as routing protocol and TCP BulkSend application. I am testing my scenario with 10 nodes, including one sink and one source nodes in a 500 x 500 m area (i place the nodes very close to make sure that their are in line of sight).

The thing is there is no TCP packets being transmitted at all. I looked at other examples in the mailing list but they look similar to mine. Here's a snippet of my code (full script attached).

  // Enable OLSR
  OlsrHelper olsr;
  Ipv4StaticRoutingHelper staticRouting;

  Ipv4ListRoutingHelper list;
  list.Add (staticRouting, 0);
  list.Add (olsr, 10);

  InternetStackHelper internet;
  internet.SetRoutingHelper (list); // has effect on the next Install ()
  internet.Install (c);

  Ipv4AddressHelper ipv4;
  NS_LOG_INFO ("Assign IP Addresses.");
  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
  Ipv4InterfaceContainer i = ipv4.Assign (devices);
 
  uint16_t port = 9;  // well-known echo port number

  // Configuring Bulk Send Application and installing in the Source Node
  BulkSendHelper source ("ns3::TcpSocketFactory",
                         InetSocketAddress (Ipv4Address::GetAny (), port));
  // Set the amount of data to send in bytes.  Zero is unlimited.
  source.SetAttribute ("SendSize", UintegerValue (1024));
  source.SetAttribute ("MaxBytes", UintegerValue (5120000)); // 5 MB
   
  ApplicationContainer sourceApps = source.Install (c.Get (sourceNode));
  sourceApps.Start (Seconds (30.0)); // to give time to OLSR to converge
  sourceApps.Stop (Seconds (4000.0));
 
  // Create a packet sink Application and install it on the Sink node
  PacketSinkHelper sink ("ns3::TcpSocketFactory",
                         InetSocketAddress (Ipv4Address::GetAny (), port));
                         
  ApplicationContainer sinkApps = sink.Install (c.Get (sinkNode));
  sinkApps.Start (Seconds (0.0));
  sinkApps.Stop (Seconds (4000.0));
 
  Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (1460));

What am I missing?

Thank you

[John Scott]

Got it!

The source node should be:

BulkSendHelper source ("ns3::TcpSocketFactory",

                         InetSocketAddress (i.GetAddress (sinkNode), port));

Thanks anyway :)