[Babel-users] cornercase issue (link sensing)

Henning Rogge hrogge at googlemail.com
Wed Apr 29 18:57:33 UTC 2009

On Mittwoch 29 April 2009 20:51:38 Juliusz Chroboczek wrote:
> > Theoretically two nodes in "two-hop" range might get the same linklocal
> > IP, because they don't share a link, but the node between them would be
> > in trouble.
> Yep.  A possible workaround would be to assign random IPv6 interface-ids
> to the interfaces.  (There's 62 bits of randomness in a locally-assigned
> interface-id, which should be unique enough unless /dev/random is very
> badly broken.)
Think about routers without internal clock... after a large scale power 
outage. Not much randomness until you switch on the network cards. ;)

> The downside is that you'll end up with interface-ids that don't stick
> across a reboot, but that's the price you pay for dodgy hardware.
Yep... there is no free lunch.

> Have you actually run into that issue (truly curious)?  In case you
> have, running this on the guilty interfaces just after they've been
> ifupped should fix it (untested):
There are not many IPv6 OLSR networks because many firmware images don't even 
contain IPv6 support :(

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