linux-kernel - Re: [ipv6] Odd behaviour...

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Message-ID: <20080529085914.GE11812@pomac.netswarm.net>
Date:	Thu, 29 May 2008 10:59:14 +0200
From:	pomac@...or.com
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux-kernel <Linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [ipv6] Odd behaviour...

On Thu, May 29, 2008 at 01:51:31AM -0700, Andrew Morton wrote:
> On Thu, 29 May 2008 10:41:57 +0200 pomac@...or.com wrote:
> 
> > On Thu, May 29, 2008 at 12:27:29AM -0700, Andrew Morton wrote:
> > > On Tue, 27 May 2008 00:58:30 +0200 Ian Kumlien <pomac@...or.com> wrote:
> > > 
> > > > Hi, 
> > > > 
> > > > I just recently acquired a new ipv6 tunnel since my two previous brokers
> > > > has gone out of business. I now use hurricane electrics tunnel since i
> > > > have really good ping times to it's node in Amsterdam.
> > > > 
> > > > Anyways, i have setup a local network tunnel and enabled forwarding.
> > > > 
> > > > After about 300 seconds, it all stops working. I have to disable and
> > > > re-enable it on the firewall/router to get it working again.
> > > > 
> > > > tcpdump shows the router/firewall doing odd things like:
> > > > (i renamed my host to piv6)
> > > > 
> > > > 00:48:14.294173 IP6 piv6 > igloo.stacken.kth.se: ICMP6, echo request,
> > > > seq 321, length 64
> > > > 
> > > > 00:48:14.341288 IP6 igloo.stacken.kth.se > piv6: ICMP6, echo reply, seq
> > > > 321, length 64
> > > > 
> > > > 00:48:14.341317 IP6 fe80::55e4:1b90 > igloo.stacken.kth.se: ICMP6,
> > > > redirect, piv6 to piv6, length 160
> > > > 
> > > > 00:48:14.341332 IP6 igloo.stacken.kth.se > piv6: ICMP6, echo reply, seq
> > > > 321, length 64
> > > > ---
> > > > 
> > > > fe80::55e4::1b90 is the local ip of the ipv6 tunnel.
> > > > (note: the packet never arrives at it's destination)
> > > > 
> > > > Any ideas of what could be going wrong?			
> > > 
> > > (cc netdev - afaik linux-net is kind of dead)
> > 
> > Thanks, i knew i missed something, -net was the one that was already in
> > my email client so... =)
> 
> Yeah.  linux-net _might_ be a hive of activity, dunno.  I haven't been
> there in years.  Perhaps it should be retired.

Heh, i'll look in the archives... =)

> > > What kernel version are you running?
> > 
> > The router/fw is running 2.6.25.1, the client is running 2.6.25.4
> > 
> > Any additional information i should provide?
> 
> It would be interesting if you know of any earlier kernel version which
> works OK?

Well, for me it was ages since i used ipv6... So i can't really help. I
was more hoping for someone in the same position or someone who'd seen
something simular and solved it.

>From what i gather, i have done nothing wrong and a forward shouldn't
time out. Ie, if it works it should keep working.

It would be really interesting to see what the other end of a ipv6
tunnel sees when it pings, but i don't have the means to test that
currently.

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