[Ns-developers] PCAP or OnOffApplication changes?

[Glenn Evans]

Hello,

I've been using the ns-3-dev branch since the 3.7 release and have developed
a number of simulations for my thesis. I use a python script and tcpdump to
get the throughput values from the ns-3 generated .pcap files. Until today,
those .pcap files were as expected and included data transmissions for all
clients in the network.

However, today after I pulled the most recent version from the ns-3-dev
server the exact same scripts and files now generate no useful data. The
only packets seen in wireshark from the .pcap files are ARP, RTS/CTS, and
AODV packets, with an occasional TCP packet from sender 102.102.102.102 (not
an assigned address).

Here is the code for setting up my OnOffApplication:

// Takes a client, server, and start/stop times and creates an On/Off
connection between them
void
AccessPoint::ApplicationSetup (Ptr<Node> client, Ptr<Node> server, double
start, double stop, int port, int packetSize)
{
  Ptr<Ipv4> ipv4Server = server->GetObject<Ipv4>();
  Ptr<Ipv4> ipv4Client = client->GetObject<Ipv4>();

  Ipv4InterfaceAddress iaddrServer = ipv4Server->GetAddress(1,0);
  Ipv4InterfaceAddress iaddrClient = ipv4Client->GetAddress(1,0);

  Ipv4Address ipv4AddrServer = iaddrServer.GetLocal ();
  Ipv4Address ipv4AddrClient = iaddrClient.GetLocal ();

  if (m_verbose)
  {
    std::cout << "Set up Server with ip " << ipv4AddrServer
                << " and connecting to Client with ip " << ipv4AddrClient <<
"\n";
  }

  // The OnOff application generates packets from the CLIENT NODE
  //    - NOTE: At a 20Mbps rate, this is intentionally going to flood the
queue
  OnOffHelper onoff ("ns3::TcpSocketFactory",
Address(InetSocketAddress(ipv4AddrServer,port)));
  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable
(.9)));
  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable
(.1)));
  onoff.SetAttribute ("DataRate", DataRateValue (DataRate ("20Mbps")));
  onoff.SetAttribute ("PacketSize", UintegerValue (packetSize));

  // The client generates On/Off traffic to send to the server
  ApplicationContainer apps = onoff.Install (client);
  apps.Start (Seconds (start));
  apps.Stop (Seconds (stop));

  // The sink "catches" the packets from the client
  PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory",
Address(InetSocketAddress(ipv4AddrServer,port)));
  ApplicationContainer sinkApp = sinkHelper.Install (server);
  sinkApp.Start (Seconds (start));
  sinkApp.Stop (Seconds (stop));
}


My question is what could've changed with either the .pcap handler or
OnOffApplication that would render my simulation files useless?

I've attached a .pcap file from both the old and new ns-3 simulator. Let me
know if there is anything else you may need.

Thanks for your help,

Glenn
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