data generator for testing switch

[shin...@gmail.com]

Hello All,

I am trying to develop a simple netdevice that can switch data between multiple nodes.
I am at a point where I need to use a traffic source to test my module. I tried to use to use the Echo Server/client application.
But I get the following error, possibly its trying to route the packet using SPF (but I am intersted to switch the packet)

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff2ff7c33 in ns3::GlobalRoutingLinkRecord::GetLinkData (this=0x0) at ../src/internet/model/global-router-interface.cc:91

So I wanted to know if there is any lower level (layer 2) packet generator availble for testing

[Tommaso Pecorella]

Hi,

yes, there is, but that's not the root of the problem.

I warmly suggest to:

1) learn to use a debugger,

2) check your scripts

The simulation is only ding what you're asking to do. It's not using OSPF or GlobalRouting if you don't ask explicitly to do so.

Have fun,

T.

[shin...@gmail.com]

Thanks Tomasso,

I used gdb and looked at the backtrace files. But they mainly point to the

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff2ff7c33 in ns3::GlobalRoutingLinkRecord::GetLinkData (this=0x0) at ../src/internet/model/global-router-interface.cc:91

91      return m_linkData;
(gdb) bt
#0  0x00007ffff2ff7c33 in ns3::GlobalRoutingLinkRecord::GetLinkData (this=0x0) at ../src/internet/model/global-router-interface.cc:91
#1  0x00007ffff301a94d in ns3::GlobalRouteManagerImpl::SPFNexthopCalculation (this=0x7146b0, v=0x712460, w=0x712400, l=0x714d80, distance=1)
    at ../src/internet/model/global-route-manager-impl.cc:1059
#2  0x00007ffff3019e42 in ns3::GlobalRouteManagerImpl::SPFNext (this=0x7146b0, v=0x712460, candidate=...)
    at ../src/internet/model/global-route-manager-impl.cc:874
#3  0x00007ffff301d57a in ns3::GlobalRouteManagerImpl::SPFCalculate (this=0x7146b0, root=...)
    at ../src/internet/model/global-route-manager-impl.cc:1403
#4  0x00007ffff3018594 in ns3::GlobalRouteManagerImpl::InitializeRoutes (this=0x7146b0) at ../src/internet/model/global-route-manager-impl.cc:727
#5  0x00007ffff3010114 in ns3::GlobalRouteManager::InitializeRoutes () at ../src/internet/model/global-route-manager.cc:58
#6  0x00007ffff3036666 in ns3::Ipv4GlobalRoutingHelper::PopulateRoutingTables () at ../src/internet/helper/ipv4-global-routing-helper.cc:64
#7  0x000000000040eeb6 in main (argc=2, argv=0x7fffffffe318) at ../scratch/my-module/my-module.cc:203

Could you please specify the alternate way to test a module. I think that will be very helpful. In the meantime I will debut it.

Thanks,

[Tommaso Pecorella]

Hi,

yes, the problem is in GlobalRoute, but it may be your device messing with the GlobalRoute assumptions and how it works.

Suggestion: you said that you're doing a switch. Test it without calling Ipv4GlobalRoutingHelper::PopulateRoutingTables () !

T.

[shin...@gmail.com]

Thanks, I tried that and solved the issue.