2.6.19.2 IPv6 ND broken because ff02::1 not joined

[Michael H. Warfield]

On Mon, 2007-01-15 at 06:39 +0200, Pekka Savola wrote:
> On Sat, 13 Jan 2007, Pekka Savola wrote:
> > FC6 updates-testing kernel based on 2.6.19.2 (kernel-2.6.19-1.2895.fc6) seems 
> > to have a broken IPv6 stateless address autoconf.  The previous, successfully 
> > tested version was based on 2.6.18.5 (kernel-2.6.18-1.2860.fc6).
> >
> > The problem appears to be that the host is not joining the all-nodes 
> > multicast address (ff02::1) [netstat -g -n], so the IP layer isn't processing 
> > the received router advertisements even though you can see them with tcpdump. 
> > The solicited node mcast address is joined though. Loopback interface doesn't 
> > join ff02::1 either.
> >
> > linux-2.6-xen.patch at least seems to be making some modifications to IPv6 ND 
> > code, but I didn't look closely enough if that's the culprit.
> >
> > If it matters, the network adapter is Realtek 8139.

> Two more bits of information:

>   - one person commented off-list that for him, breakage happened 
> between 2.6.19.1 and 2.6.19.2.

>   - kernel-2.6.20rc4-git4 [latest from devel  kernel-2.6.19-1.2911] is 
> also similarly affected.

	According to comments on lkml, a fix went in post 2.6.20rc5 to fix
joining the all nodes multicast group and that does fix the breakage.  I
think that pretty much implies that 2.6.19 is toast for IPv6.

	Waiting for 2.6.20...

> -- 
> Pekka Savola                 "You each name yourselves king, yet the
> Netcore Oy                    kingdom bleeds."
> Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

	Mike
-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
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