IPv6 policy based source routing

[Matt Smith]

On 22 March 2011 03:00, J. Hellenthal <jhell at dataix.net> wrote:
>
> Hi Matt,
>
> Unofficially not sure if you have already checked into this so I am not sure if it is really a solution to your problem but may be a step forward. Check out the man page for ip6addrctl(8) that allows you to set a precedence for each prefix/route. The default output of ip6addrctl(8) can be dumped into /etc/ip6addrctl.conf where it will also be parsed and restored upon reboot.
>

This does indeed look like exactly what I was after however I can't
seem to get it to do anything unless I'm using it wrong.

root at tao[~]# ip6addrctl show
Prefix                          Prec Label      Use
::1/128                           50     0        0
::/0                              40     1   155126
2002::/16                         30     2        0
::/96                             20     3        0
::ffff:0.0.0.0/96                 10     4        0

The IP on vr0 is 2a01:348:294::1/64 and the IP on gif0 is
2a01:348:6:45c::2/128. Right now if I ping6 ipv6.google.com I get this
PING6(56=40+8+8 bytes) 2a01:348:6:45c::2 --> 2a00:1450:8002::67 so
it's sourcing traffic from the gif0 IP. I assume in that list the
higher the precedence the higher the priority so I ran "ip6addrctl add
2a01:348:294::/64 45 5". This makes no difference. Traffic still comes
from the gif0 IP.

I also tried adding the gif0 prefix with "ip6addrctl add
2a01:348:6:45c::2/128 44 6" to make it lower but same effect. In case
I got the precedence the wrong way round I tried reversing it. Same
effect.

So I guess I'm not using it correctly. Can you enlighten me as to what
I'm doing wrong with it?

Matt.