[ns] Simulation halting after ARP request in Wifi, ns3

[Amit Soni]

Hello ns users,

I am simulating a small Adhoc-wifi network of 4 nodes in ns3. Two nodes
are OnOff sources and other two of them are OnOff sinks. I am starting two
source nodes at the same time. The problem I am facing is that, after ARP
request the simulation just halts, not even a single data packet is sent.
Following is my script:

#include <iostream>
#include <fstream>
#include "ns3/core-module.h"
#include "ns3/common-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/mobility-module.h"
#include "ns3/contrib-module.h"
#include "ns3/wifi-module.h"

using namespace ns3;
int main (int argc, char *argv[])
{
  Packet::EnableMetadata ();
  Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold",
StringValue ("0"));   // enable rts cts all the time.

  WifiHelper wifi;
  MobilityHelper mobility;
  NodeContainer stas;
  NetDeviceContainer staDevs;
  InternetStackHelper stack;

  stas.Create (4);

  Ptr<WifiChannel> channel = CreateObject<WifiChannel> ();
  channel->SetPropagationDelayModel
(CreateObject<ConstantSpeedPropagationDelayModel> ());
  Ptr<LogDistancePropagationLossModel> log =
CreateObject<LogDistancePropagationLossModel> ();
  log->SetReferenceModel (CreateObject<FriisPropagationLossModel> ());
  channel->SetPropagationLossModel (log);

  wifi.SetPhy ("ns3::WifiPhy");
  wifi.SetRemoteStationManager ("ns3::ArfWifiManager");
  wifi.SetMac ("ns3::AdhocWifiMac");

  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",

    "MinX", DoubleValue (0.0),

    "MinY", DoubleValue (0.0),

    "DeltaX", DoubleValue (5.0),

    "DeltaY", DoubleValue (10.0),

    "GridWidth", UintegerValue (3),

    "LayoutType", StringValue ("RowFirst"));

  mobility.SetMobilityModel ("ns3::StaticMobilityModel");
  mobility.Install (stas);

  staDevs = wifi.Install (stas, channel);
  stack.Install (stas);
  Ipv4AddressHelper ipv;
  ipv.SetBase ("10.1.1.0", "255.255.255.0");
  Ipv4InterfaceContainer ipvcontain = ipv.Assign (staDevs);

          OnOffHelper onoff1 ("ns3::UdpSocketFactory", InetSocketAddress
(ipvcontain.GetAddress (1), 9));
          onoff1.SetAttribute ("OnTime", RandomVariableValue
(ConstantVariable
(10)));
          onoff1.SetAttribute ("OffTime", RandomVariableValue
(ConstantVariable
(0)));
          ApplicationContainer apps1 = onoff1.Install (stas.Get (0));
          apps1.Start (Seconds (0.5));
          apps1.Stop (Seconds (10.0));
      PacketSinkHelper sink ("ns3::UdpSocketFactory", Address
(InetSocketAddress (Ipv4Address::GetAny (), 9)));
      sink.Install (stas.Get (1));
      onoff1.SetAttribute ("Remote", AddressValue (InetSocketAddress
(ipvcontain.GetAddress (3), 9)));
      ApplicationContainer apps2 = onoff1.Install (stas.Get (2));
      sink.Install (stas.Get (3));
      apps2.Start(Seconds (0.5));
      apps2.Stop (Seconds (10.0));

  std::ofstream ascii("out.tr");
  WifiHelper::EnableAsciiAll(ascii);

  Simulator::Stop (Seconds (10.0));
  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}


Following is content of out.tr after simulation:

+ 508192000ns /NodeList/0/DeviceList/0/$ns3::WifiNetDevice/Phy/Tx
ns3::WifiMacHeader (DATA ToDS=0, FromDS=0, MoreFrag=0, Retry=0, MoreData=0
Duration/ID=0usDA=ff:ff:ff:ff:ff:ff, SA=00:00:00:00:00:01,
BSSID=ff:ff:ff:ff:ff:ff, FragNumber=0, SeqNumber=0) ns3::LlcSnapHeader
(type 0x806) ns3::ArpHeader (request source mac: 00-06-00:00:00:00:00:01
source ipv4: 10.1.1.1 dest ipv4: 10.1.1.2) ns3::WifiMacTrailer ()
+ 508192000ns /NodeList/2/DeviceList/0/$ns3::WifiNetDevice/Phy/Tx
ns3::WifiMacHeader (DATA ToDS=0, FromDS=0, MoreFrag=0, Retry=0, MoreData=0
Duration/ID=0usDA=ff:ff:ff:ff:ff:ff, SA=00:00:00:00:00:03,
BSSID=ff:ff:ff:ff:ff:ff, FragNumber=0, SeqNumber=0) ns3::LlcSnapHeader
(type 0x806) ns3::ArpHeader (request source mac: 00-06-00:00:00:00:00:03
source ipv4: 10.1.1.3 dest ipv4: 10.1.1.4) ns3::WifiMacTrailer ()
r 508304033ns /NodeList/3/DeviceList/0/$ns3::WifiNetDevice/Phy/RxOk
ns3::WifiMacHeader (DATA ToDS=0, FromDS=0, MoreFrag=0, Retry=0, MoreData=0
Duration/ID=0usDA=ff:ff:ff:ff:ff:ff, SA=00:00:00:00:00:01,
BSSID=ff:ff:ff:ff:ff:ff, FragNumber=0, SeqNumber=0) ns3::LlcSnapHeader
(type 0x806) ns3::ArpHeader (request source mac: 00-06-00:00:00:00:00:01
source ipv4: 10.1.1.1 dest ipv4: 10.1.1.2) ns3::WifiMacTrailer ()


It appears that the ARP request does collide (I dont' know why?) since the
node 3 is receiveing the ARP request sent by node 0 for node 2. But
simulation doesn't carry on. This is the whole trace file that I have
shown.
Please help me in simulating more than 1 application in wifi ns3 because
any example does not show us how to do so.
Any help would be greatly appreciated.

Thank you,
BR, Amit Soni