[OLSR-users] duplicate IP behaviour

Andreas T√łnnesen (spam-protected)
Sun Feb 12 16:29:09 CET 2006

As long as two nodes share the same _main_ address, then the nodes should
just discard the packets originating from eachother. You should see a
message like "Not processing message originating from us!"
As for messages beeing forwarded via other nodes I'll look that up later
(when I get back home).
I agree that the best solution might be that olsrd exits when encountering
a IP duplicate.. but I'm not 100% sure(perhaps this should be yet another
configurable option). But multiple nodes using the same main address will
have a very bad impact on the network. So I guess what I'm saying is that
we should enforce some sort of DAD which tries to make the network kind of
"self healing" bu terminating the conflicting clients.
But I can't remember having implemented a termination if this occurs...
Well - I'll have a look at it later on.

- Andreas

> Hi,
> When testing what would happen if two OLSR nodes have the same IP, we
> found out that both just keep on running, but they loose their peer
> connections. This was tested on version 0.4.9 on OpenWRT (Linksys
> WRT54G, IPv4).
> I tested this a long time ago and i'm quite sure the result back then
> was that the first node detecting a simular IP would just crash with a
> clear OLSR error message about what went wrong.
> Has this behaviour been changed recently, or is this a bug that got into
> the software during recent routing-algorithm changes?
> For our un-administered network setup, an OLSR crash that we can detect
> would be ideal, so we can just choose another IP and restart OLSR. If
> someone knows about another trick to detect duplicate IP numbers, i'm
> also very interested.
> Thank you for your help,
> Jaap
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