From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: pppoe with NAT not working
Date: Sun, 30 Oct 2005 16:30:58 +0100
Message-ID: <4364E732.30809@trash.net>
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To: =?ISO-8859-1?Q?S=E9bastien_Bernard?= <sbernard@nerim.net>
Cc: netfilter-devel@lists.netfilter.org, netfilter@lists.netfilter.org

S=E9bastien Bernard wrote:

> I figured out the problem.
>=20
> NAT is not working with the rp-pppoe.so plugin.
> I moved back to the
>=20
> pty "/usr/sbin/pppoe -I eth0 -T 80 -m 1452"
>=20
> Which worked now (go figure...).
> And NAT is working again.
>=20
> Any reason for this ?

We had a report about NAT failing to work in a similar situation
with HW checksums, but I couldn't find the reason. You could try:

- check if you have HW checksums enabled on the eth-device using
   ethtool
- enable conntrack logging by loading ipt_LOG and executing
   "echo 255 >/proc/sys/net/ipv4/netfilter/ip_conntrack_log_invalid".
- if this shows something about invalid checksums, disable HW
   checksumming on the eth-device and try again