[OLSR-users] duplicate IP behaviour

Andreas T√łnnesen (spam-protected)
Sun Feb 12 22:17:52 CET 2006

Hey Kosta,

Sounds like a fair plan. DAD must be done on layer3 (or higher) as long
as our mesh routing protocol works on this layer. So olsrd should prabably
take action when a duplicate is detected.
I think having a config option on what action to take in such a case is 
a good
solution. This could be either executing a command or terminating olsrd.
A restart should not be required in your case since olsrd picks up changes
in interface configurations. I think we should add logic for olsrd to stop
emitting messages when a duplicate is detected for as long as the IP does
not change. Hmm... I'll have a look at this the next time I sit down with
olsrd :-)

- Andreas

Kosta Welke wrote:

> Andreas T√łnnesen wrote:
>> 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.
> What about olsrd just invoking a script when it detects an IP duplicate?
> (Or should be "olsrd stops, invokes script, restarts?", I think this 
> is unnecessary, but you're the olsr guru)
> I am using IP zeroconf and olsr (in a small research envrionment) and 
> if  could olsr detect IP address conflicts, that would be great (ARP 
> doesnt really help in an olsr'd net). For me, invoking a script that 
> rolls the dice for just another IP address would seem like a good 
> solution.
> Just my 2 cents,
> Kosta
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