[ipv6hackers] IPv6 source address selection on Linux

Tim Chown tjc at ecs.soton.ac.uk
Mon Jul 23 15:17:10 CEST 2012

There's an example of a config for something similar in 10.5 of http://tools.ietf.org/id/draft-ietf-6man-rfc3484bis-06.txt.

We're hoping this update to 3484 will finally be pushed out soon.


On 23 Jul 2012, at 12:14, Sander Smeenk wrote:

> Quoting Jim Small (jim.small at cdw.com):
>> Sorry this isn't exactly what you wanted but hope it helps,
> Thanks for your elaborate post. Karl Auer <kauer at biplane.com.au> also
> sent me in the right direction (offlist). Aparently if you add the two
> matching source and destination addresses with the same 'label' (ip
> addrlabel) the system selects the matching pair.
> It appears to work, as i see traffic leaving the system from the
> ULA-address, but somehow the routing borks later on in the path.
> I haven't had the time to look into that yet.
> Quoting Karl Auer:
> | I got it working!
> | When I manually added the two new rules using the ip program, it
> | worked fine.
> |
> |  sudo ip addrlabel add prefix $SRCADDR/128 label 99
> |  sudo ip addrlabel add prefix $DSTADDR/128 label 99
> This can also be achieved by adding the labels to /etc/gai.conf and
> restarting your network (ifdown/ifup) or just plain rebooting.
> Thanks Karl, Jim and all other who put effort in this mistery!!
> More to follow on this if i have the time.
> With regards,
> -Sander.
> -- 
> | The world is so full of these wonderful things,
> | i'm sure we should all be as happy as kings.
> | 4096R/20CC6CD2 - 6D40 1A20 B9AA 87D4 84C7  FBD6 F3A9 9442 20CC 6CD2
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