[OLSR-users] duplicate IP behaviour

Sven-Ola Tuecke (spam-protected)
Mon Feb 13 10:36:46 CET 2006


Andeas,

please do *not* exit olsrd without further necessity. It's too easy to bring 
a complete mesh down simply by configuring an ip twice. The zeroconf people 
may consider ipv6 with an address based on the MAC instead.

My two cents: zeroconf/dhcp/rendevezous and others are unsuitable for a 
bigger mesh, because you give away the (small) opportunity for some 
management here. People need to talk to each other - which is hard a total 
anon environment. OK - that's layer 8, not covered by ISO/OSI nor olsrd ;-)

LG
Sven-Ola

"Andreas "T√łnnesen"" <(spam-protected)> schrieb im Newsbeitrag 
news:(spam-protected)
>
> 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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>
>
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