tap-bridge with p2p

[Zhouyou Gu]

Hi all

I meet a problem similar to 

https://groups.google.com/forum/#!searchin/ns-3-users/tap$20p2p%7Csort:relevance/ns-3-users/-XLYcPlXGTw/_nNzWJoge_kJ

https://groups.google.com/forum/#!searchin/ns-3-users/tap$20p2p%7Csort:relevance/ns-3-users/duQe_lvjqMo/kjRq6Hk5DgAJ

After reading these, I am still not sure how should I use tap-bridge with p2p?

or they are just not compatible?

Thanks in advance

Version ns-3.26

#include <iostream>

#include <fstream>

#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/csma-module.h"

#include "ns3/tap-bridge-module.h"

#include "ns3/point-to-point-helper.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("TapCsmaVirtualMachineExample");

int 

main (int argc, char *argv[])

{

  CommandLine cmd;

  cmd.Parse (argc, argv);

  //

  // We are interacting with the outside, real, world.  This means we have to 

  // interact in real-time and therefore means we have to use the real-time

  // simulator and take the time to calculate checksums.

  //

  GlobalValue::Bind ("SimulatorImplementationType", StringValue ("ns3::RealtimeSimulatorImpl"));

  GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));

  //

  // Create two ghost nodes.  The first will represent the virtual machine host

  // on the left side of the network; and the second will represent the VM on 

  // the right side.

  //

  NodeContainer nodes;

  nodes.Create (2);

  //

  // Use a CsmaHelper to get a CSMA channel created, and the needed net 

  // devices installed on both of the nodes.  The data rate and delay for the

  // channel can be set through the command-line parser.  For example,

  //

  // ./waf --run "tap=csma-virtual-machine --ns3::CsmaChannel::DataRate=10000000"

  //

  PointToPointHelper p2p;

  NetDeviceContainer devices = p2p.Install (nodes);

  //

  // Use the TapBridgeHelper to connect to the pre-configured tap devices for 

  // the left side.  We go with "UseBridge" mode since the CSMA devices support

  // promiscuous mode and can therefore make it appear that the bridge is 

  // extended into ns-3.  The install method essentially bridges the specified

  // tap to the specified CSMA device.

  //

  TapBridgeHelper tapBridge;

  tapBridge.SetAttribute ("Mode", StringValue ("UseBridge"));

  tapBridge.SetAttribute ("DeviceName", StringValue ("tap-left"));

  tapBridge.Install (nodes.Get (0), devices.Get (0));

  //

  // Connect the right side tap to the right side CSMA device on the right-side

  // ghost node.

  //

  tapBridge.SetAttribute ("DeviceName", StringValue ("tap-right"));

  tapBridge.Install (nodes.Get (1), devices.Get (1));

  p2p.EnablePcapAll("taplink");

  //

  // Run the simulation for ten minutes to give the user time to play around

  //

  Simulator::Stop (Seconds (600.));

  Simulator::Run ();

  Simulator::Destroy ();

}

export NS_LOG=PointToPointChannel

0s -1 PointToPointChannel:PointToPointChannel()

0s -1 PointToPointChannel:Attach(0x9037a0, 0x902b80)

0s -1 PointToPointChannel:Attach(0x9037a0, 0x903160)

0.022638s 0 PointToPointChannel:TransmitStart(0x9037a0, 0x902370, 0x902b80)

0.022638s 0 PointToPointChannel:TransmitStart(): [LOGIC] UID is 0)

0.023176s 0 PointToPointChannel:TransmitStart(0x9037a0, 0x8e9610, 0x902b80)

0.023176s 0 PointToPointChannel:TransmitStart(): [LOGIC] UID is 1)

0.023183s 0 PointToPointChannel:TransmitStart(0x9037a0, 0x8c5e80, 0x902b80)

0.023183s 0 PointToPointChannel:TransmitStart(): [LOGIC] UID is 2)

assert failed. cond="false", msg="PPP Protocol number not defined!", file=../src/point-to-point/model/point-to-point-net-device.cc, line=775

terminate called without an active exception

export NS_LOG=PointToPointNetDevice

(the last few line in the log)

0.019022s 0 PointToPointNetDevice:TransmitStart(0x1ba0b80, 0x1ba0370)

0.019022s 0 PointToPointNetDevice:TransmitStart(): [LOGIC] UID is 1)

0.019022s 0 PointToPointNetDevice:TransmitStart(): [LOGIC] Schedule TransmitCompleteEvent in 3e-09sec

0.019022s 0 PointToPointNetDevice:TransmitComplete(0x1ba0b80)

0.019022s 0 PointToPointNetDevice:TransmitComplete(): [LOGIC] No pending packets in device queue after tx complete

0.019022s 0 PointToPointNetDevice:TransmitComplete(): [DEBUG] The device queue is being woken up (0 packets and 0 bytes inside)

0.021022s 1 PointToPointNetDevice:Receive(0x1ba1160, 0x1ba0370)

0.021022s 1 PointToPointNetDevice:ProcessHeader(0x1ba1160, 0x1ba0370, 0)

0.021022s 1 PointToPointNetDevice:PppToEther()

0.021022s 1 PointToPointNetDevice:GetRemote(0x1ba1160)

0.026086s 0 PointToPointNetDevice:Send(0x1ba0b80, 0x1ba0370, 02-06-ff:ff:ff:ff:ff:ff, 2054)

0.026086s 0 PointToPointNetDevice:Send(): [LOGIC] p=0x1ba0370, dest=0x7fffd2e24b30

0.026086s 0 PointToPointNetDevice:Send(): [LOGIC] UID is 2

0.026086s 0 PointToPointNetDevice:IsLinkUp(0x1ba0b80)

0.026086s 0 PointToPointNetDevice:AddHeader(0x1ba0b80, 0x1ba0370, 2054)

0.026086s 0 PointToPointNetDevice:EtherToPpp()

assert failed. cond="false", msg="PPP Protocol number not defined!", file=../src/point-to-point/model/point-to-point-net-device.cc, line=775

terminate called without an active exception

[Tommaso Pecorella]

Hi,

it seems that you're sending something "strange" through the TAP.

Try printing the offending protocol number by changing the ASSERT message.

T.