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Message from discussion 32bit address issue (ns-3.2 stable)
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Tom Henderson  
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 More options Nov 25 2008, 9:49 am
From: Tom Henderson <t...@tomh.org>
Date: Tue, 25 Nov 2008 06:49:06 -0800
Local: Tues, Nov 25 2008 9:49 am
Subject: Re: 32bit address issue (ns-3.2 stable)
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Norman wrote:
>> I believe that this in general is related to the lack of support for
>> stub networks, as has been recently called out in the end of bug 406:http://www.nsnam.org/bugzilla/show_bug.cgi?id=406

>> I believe that, after bug 406 is fixed, you should be able to create a
>> new virtual device (a second loopback) and put an address on it and use
>> that as a router ID; I'll write a test case for that scenario.

>> I am going to prioritize fixing the above this week and will get back to
>> you when I make progress.

> Hi Tom,

> Thanks for your replay. Now  I understand that problem is caused by a
> stub networks.
> I would be great if you could somehow manage to fix it!
> I appreciate prioritizing this issue, that's fantastic!

> One more question, by problem with "stab networks" do you mean a
> general routing issue
> or just a problem with global route manager? Bug seems to be  related
> only to global route manager,
> so my understanding is that if I will use a static route API (I didn't
> try this before) routing should work?

The global route manager is a port of the Dijkstra algorithm from
quagga's OSPFv2 implementation.  OSPF shortest path computation is a
two-stage process; in the first stage, routes to shared and transit
links are computed, and in the second stage, routes to stub networks and
interfaces are computed.  We only implemented the first stage initially,
since it was sufficient to cover initial use cases in which every link
was part of the routing topology.

Yes, you can directly set routes using the static routing API available
in class ns3::Ipv4.

- Tom


 
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