netdev - Re: Wired behaviour with IPv6 over PPP

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Message-Id: <20080522014959.0f6191aa.akpm@linux-foundation.org>
Date:	Thu, 22 May 2008 01:49:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthias Cramer <matthias.cramer@...erway.ch>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: Wired behaviour with IPv6 over PPP

On Wed, 21 May 2008 14:56:43 +0200 Matthias Cramer <matthias.cramer@...erway.ch> wrote:

> Hi All
> 
> I have a very wired behaviour when doing IPv6 over PPPoE.
> 
> The situation:
> 
> A linux box connected to a DSL Modem, on the other side is a Cisco LNS which terminates the PPP session (actually L2TP).
> I have control over both ends.
> 
> When I have net.ipv6.conf.all.forwarding set to 0 then the ppp Interface gets a IPv6 address from the Cisco via IP6CP.
> When I have net.ipv6.conf.all.forwarding set to 1 them the ppp Interface does not get an address, it has only a normal link local address.
> 
> When I start the ppp session with forwarding set to 0 I can ping out and there exists a default route to ppp0 , then I switch forwarding to 1
> the default route disappears and therefore routing does not work any longer.
> 
> Is this a known behaviour ?
> 
> Or am I doing something the wrong way ?
> 
> Kernel version is 2.6.25
> 

(cc netdev)
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