linux-kernel - Wired behaviour with IPv6 over PPP

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Message-ID: <48341C0B.7010003@interway.ch>
Date:	Wed, 21 May 2008 14:56:43 +0200
From:	Matthias Cramer <matthias.cramer@...erway.ch>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Wired behaviour with IPv6 over PPP

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

Best regards

  Matthias

-- 
Matthias Cramer / mc322-ripe   System & Network Manager
Interway Communication GmbH    Phone +41 43 500 1111
Josefstrasse 225               Fax   +41 44 271 3535
CH-8005 Zürich                 http://www.interway.ch/
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