IPv6 policy based source routing

[Hajimu UMEMOTO]

Hi,

>>>>> On Tue, 22 Mar 2011 09:19:55 +0000
>>>>> Matt Smith <matt.xtaz at gmail.com> said:

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

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

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

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

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

Unfortunately, RFC 3484 doesn't work well for your situation because
of the existence of Rule 5 which prefers outgoing interface.  This
rule is annoying for some situation such as BGP peering which requires
a global address to an interface.
I'm using the attached patches to ignore this rule, intentionally.  It
breaks RFC 3484, though.

Sincerely,
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--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume at mahoroba.org  ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/