Static routing in wifi adhoc???

[Wei Wang]

Dear all:

I am recently simulating a algorithm, it requires the fixed roouting in wifi ad-hoc. However, OLSR, AODV routing protocols will select a new route if I change the txpower during simulation. So I want the routes to be fixed. If I use the chain topology, the packet should send on by one.

I am tring to use static routing in wifi, but it has a run-time error, after I dubug it, it showed:

Program received signal SIGSEGV, Segmentation fault.

0x00000000004249c7 in ns3::PeekPointer<ns3::NetDevice> (p=...) at ./ns3/ptr.h:281

281  return p.m_ptr;

I previously used the OLSR, it run correctly.  I am looking for help!

It is my topology: n0------n1------n2------n3------n4------n5

I want to creat the routes of two flows:, tcp n0->n3, n2->n5, following is the key part of routing:

......

......

NetDeviceContainer staDevices;

staDevices = wifi.Install (phy, mac, c);

..........

.........

  Ipv4StaticRoutingHelper staticRoutingHelper;

  Ipv4ListRoutingHelper listRouting;

  listRouting.Add (staticRoutingHelper, 0);

  

  InternetStackHelper stack;

  stack.SetRoutingHelper (listRouting);

  stack.Install (c);

  

  NS_LOG_INFO ("Assign IP Addresses.");

  Ipv4AddressHelper address;

  address.SetBase ("10.1.1.0", "255.255.255.0");

  Ipv4InterfaceContainer interfaces = address.Assign (staDevices);

  Ptr<Ipv4> ipv4A = c.Get(0)->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4B = c.Get(1)->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4C = c.Get(2)->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4D = c.Get(3)->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4E = c.Get(4)->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4F = c.Get(5)->GetObject<Ipv4> ();

  //A<--1-->B<--2-->C<--1-->D<--2-->E<--1-->F

  //n0------n1------n2------n3------n4------n5

Ptr<Ipv4StaticRouting> staticRoutingA = staticRoutingHelper.GetStaticRouting (ipv4A);

  Ptr<Ipv4StaticRouting> staticRoutingB = staticRoutingHelper.GetStaticRouting (ipv4B);

  Ptr<Ipv4StaticRouting> staticRoutingC = staticRoutingHelper.GetStaticRouting (ipv4C);

  Ptr<Ipv4StaticRouting> staticRoutingD = staticRoutingHelper.GetStaticRouting (ipv4D);

  Ptr<Ipv4StaticRouting> staticRoutingE = staticRoutingHelper.GetStaticRouting (ipv4E);

  Ptr<Ipv4StaticRouting> staticRoutingF = staticRoutingHelper.GetStaticRouting (ipv4F);

  //N0->N3

  staticRoutingA->AddHostRouteTo (Ipv4Address ("10.1.1.4"), Ipv4Address ("10.1.1.2"), 1);//The ifIndex for this outbound route is 1;loopback is 0

  staticRoutingB->AddHostRouteTo (Ipv4Address ("10.1.1.4"), Ipv4Address ("10.1.1.3"), 2);

  staticRoutingC->AddHostRouteTo (Ipv4Address ("10.1.1.4"), Ipv4Address ("10.1.1.4"), 1);

  staticRoutingD->AddHostRouteTo (Ipv4Address ("10.1.1.4"), Ipv4Address ("10.1.1.4"), 0);

  //N3->N0

  staticRoutingD->AddHostRouteTo (Ipv4Address ("10.1.1.1"), Ipv4Address ("10.1.1.3"), 1);

  staticRoutingC->AddHostRouteTo (Ipv4Address ("10.1.1.1"), Ipv4Address ("10.1.1.2"), 2);

  staticRoutingB->AddHostRouteTo (Ipv4Address ("10.1.1.1"), Ipv4Address ("10.1.1.1"), 1);

  staticRoutingA->AddHostRouteTo (Ipv4Address ("10.1.1.1"), Ipv4Address ("10.1.1.1"), 0);

  //N2->N5

  staticRoutingC->AddHostRouteTo (Ipv4Address ("10.1.1.6"), Ipv4Address ("10.1.1.4"), 1);

  staticRoutingD->AddHostRouteTo (Ipv4Address ("10.1.1.6"), Ipv4Address ("10.1.1.5"), 2);

  staticRoutingE->AddHostRouteTo (Ipv4Address ("10.1.1.6"), Ipv4Address ("10.1.1.6"), 1);

  staticRoutingD->AddHostRouteTo (Ipv4Address ("10.1.1.6"), Ipv4Address ("10.1.1.6"), 0);

   //N5->N2

  staticRoutingF->AddHostRouteTo (Ipv4Address ("10.1.1.3"), Ipv4Address ("10.1.1.5"), 1);

  staticRoutingE->AddHostRouteTo (Ipv4Address ("10.1.1.3"), Ipv4Address ("10.1.1.4"), 2);

  staticRoutingD->AddHostRouteTo (Ipv4Address ("10.1.1.3"), Ipv4Address ("10.1.1.3"), 1);

  staticRoutingC->AddHostRouteTo (Ipv4Address ("10.1.1.3"), Ipv4Address ("10.1.1.3"), 0);

......

[Tommaso Pecorella]

Hi,

  staticRoutingB->AddHostRouteTo (Ipv4Address ("10.1.1.4"), Ipv4Address ("10.1.1.3"), 2);

I don't see two interfaces in that node... I just see one. Am I missing something ?

T.

[yuechengww]

Hi:
Thank you very much~It should be 1, not 2. 

However, since there are two tcp flows, when I run the codec, there is only one flow can tramsmit at a time.In other words, each flow transmit individually well, but two flows can not send together. By the way, I let their app start time to be different. Who knows why? Is it due to static routing?  

[Wei Wang]

Hi:

You are right, there is only one interface, so it should be 1, not 2, thank you very much!

However, when I run my code, there is always a tcp flow 1 (n0->n5) has throughput, another does not transmit, or vice versa. Most impoertant thing is that I traced the tcp congestion window and rtt, found that the tcp seems did not work!

Is due to the static routing? It is very strange~ 

Does anyone know why?

Many thanks~

ww