Configuring default gateway in a ns3 node

[Dani Camps]

Dear all,

I would like to know how to specify a default gateway in a certain node in an ns3 simulation. Currently I use "Ipv4GlobalRoutingHelper::PopulateRoutingTables ();" to populate routing tables, but I do not find the way to establish a default gateway.

Best Regards

Daniel

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[Antti Mäkelä]

On May 20, 1:20 pm, Dani Camps <danicamp...@gmail.com> wrote:
> Dear all,
>
> I would like to know how to specify a default gateway in a certain node in
> an ns3 simulation. Currently I use
> "Ipv4GlobalRoutingHelper::PopulateRoutingTables ();" to populate routing
> tables, but I do not find the way to establish a default gateway.

That's because global routing only cares about existing subnets. You
can either:

Use static routing for that:

Ptr<Node> Node = your node;
Ipv4StaticRoutingHelper helper;
Ptr<Ipv4> ipv4 = Node->GetObject<Ipv4>();
Ptr<Ipv4StaticRouting> Ipv4stat = helper.GetStaticRouting(ipv4);
Ipv4stat->SetDefaultRoute(....)

OR, you can use global routing's external routes, or injection:

PopulateRoutingTables();
Ptr<GlobalRouter> gr = Node->GetObject<GlobalRouter>();
gr->InjectRoute(.....)
Ipv4GlobalRoutingHelper::RecomputeRoutingTables();

See doxygen for parameters.

[Pavel Boyko]

Hi, Antti,

I think this answer deserves to be here:
http://www.nsnam.org/wiki/index.php/Category:Samples . Could you do
this?

Pavel

[Dani Camps]

Hi Antti,

Thanks for the response, it worked. Only a small addition in case someone else needs to solve a similar problem. I needed to include "ns3/global-router-interface.h" in order to use GlobalRouter.

Best Regards

Daniel

[Tom Henderson]

On 5/21/10 1:53 AM, Dani Camps wrote:
>
> Hi Antti,
>
> Thanks for the response, it worked. Only a small addition in case
> someone else needs to solve a similar problem. I needed to include
> "ns3/global-router-interface.h" in order to use GlobalRouter.
>
> Best Regards
>
> Daniel
>

Daniel, I am curious about why you want to install a default route if
global routing already provides a route to every subnet in the scenario?
(I'm just trying to learn more about how people are using global
routing, in practice)

- Tom

[Dani Camps]

Hi Tom,

I am using ns3 for emulation. I have two "real" networks connected through an ns3 simulation which has some other subnetworks inside. Therefore, to make the two "real" networks connect to each other I have to tell the ns3 nodes about the them.

Best Regards

Daniel

[Siku]

 Sir how to set default gateway.....And also how to configure links between nodes and gateway with different configuration,,

[Jatin Singh]

thanks for this information .but i am facing still a problem

http://imgur.com/PNtv8jk

this my real topology.i want that a real traffic should come from router 1 and traffic comes into ns3 emulation and goes from ns3 to real router R2. am iam not able solve this problem.can anybody help me on this problem.