direct routes and SLAAC addresses

[George Ross]

Many thanks for answering my stubnet question a couple of weeks or so back. 
I have a supplementary direct-protocol question now...

We have a Linux router running BIRD 2.0.8.  It has some interfaces on which 
we configure IPv6 addresses statically.  We turn off auto-configuration, 
but, due to a race condition which it's going to be hard to fix, when we 
reboot the machine we can end up with SLAAC addresses as well as the static 
IPv6 addresses.

We start BIRD, and the direct protocol imports the subnets, so we can then 
export them to BGP.  The problem seems to come when the kernel ages out the 
SLAAC addresses.  It looks as though when a SLAAC address goes, the 
direct protocol notices and stops importing the corresponding subnet.
Unfortunately, it looks as though it doesn't realise that there's still a 
static IPv6 address for the subnet, and that it should therefore continue 
to import it.

Does that sound right, or am I missing some bit of configuration somewhere?

(As a hack workaround we now delete all of those unwanted SLAAC addresses 
before we start BIRD.)

Thanks again for your help, and for BIRD.  It's been very useful!

-- 
George D M Ross MSc PhD CEng MBCS CITP
University of Edinburgh, School of Informatics,
Appleton Tower, 11 Crichton Street, Edinburgh, Scotland, EH8 9LE
Mail: gdmr at inf.ed.ac.uk   Voice: 0131 650 5147 
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