IPv6 policy routing not working on Ubuntu 8.04.3

IPv6 policy routing not working on Ubuntu 8.04.3

[Ben Swartzlander]

I'm trying to setup some routing policy rules for IPv6 on Ubuntu 8.04.3, 
and it appears to be broken.

root@asura /root
% uname -a
Linux asura 2.6.24-23-generic #1 SMP Wed Apr 1 21:47:28 UTC 2009 i686 
GNU/Linux

root@asura /root
% ip -6 rule list

root@asura /root
% ip -6 rule add from fd2e:51e9:65d3::/48 table 17 prio 700
RTNETLINK answers: Unknown error 4294967199


Notice how there are no rules listed when I run "ip -6 rule list", not 
even the normal local/main rules. I have no idea what the unknown error 
is from RTNETLINK. Anyways I have no problem with ip6tables, ipv6 
routing, or ipv4 policy routing on this machine, and ipv6 policy routing 
does work on some of my other machines (with newer kernels). I'm 
wondering if I'm missing some module or if I have bad configuration, or 
is upgrading the kernel my only hope?


thanks,
Ben Swartzlander

Re: IPv6 policy routing not working on Ubuntu 8.04.3

[Thomas Jacob]

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On Mon, 2009-09-21 at 09:46 -0400, Ben Swartzlander wrote:
> I'm trying to setup some routing policy rules for IPv6 on Ubuntu 8.04.3, 
> and it appears to be broken.
> 
> root@asura /root
> % uname -a
> Linux asura 2.6.24-23-generic #1 SMP Wed Apr 1 21:47:28 UTC 2009 i686 
> GNU/Linux
> 
> root@asura /root
> % ip -6 rule list
> 
> root@asura /root
> % ip -6 rule add from fd2e:51e9:65d3::/48 table 17 prio 700
> RTNETLINK answers: Unknown error 4294967199
> 
> 
> Notice how there are no rules listed when I run "ip -6 rule list", not 
> even the normal local/main rules. I have no idea what the unknown error 
> is from RTNETLINK. Anyways I have no problem with ip6tables, ipv6 
> routing, or ipv4 policy routing on this machine, and ipv6 policy routing 
> does work on some of my other machines (with newer kernels). I'm 
> wondering if I'm missing some module or if I have bad configuration, or 
> is upgrading the kernel my only hope?

The ipv6 routing stack inside the kernel is a separate
being that doesn't share much with the ipv4 stack (in those
kernel versions at least), and still lacks  some of the nicer features
that the iproute interface pretends exists also for ipv6 (especially in
old kernel versions). So in general, expect problems if you try to
use the more exotic features of ip -6/ip6tables.

But in your case the problem is simply that the -generic Ubuntu 8.04
kernels are compiled without CONFIG_IPV6_MULTIPLE_TABLES. You could
try the -server kernels instead, they might work for this particular
feature.



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