From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick McHardy Subject: Re: BUG: warning at net/core/dev.c:1171/skb_checksum_help() 2.6.18-rc3 Date: Mon, 31 Jul 2006 06:24:31 +0200 Message-ID: <44CD85FF.9010607@trash.net> References: <44CD8415.2020403@davidcoulson.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from stinky.trash.net ([213.144.137.162]:18571 "EHLO stinky.trash.net") by vger.kernel.org with ESMTP id S1751462AbWGaEYd (ORCPT ); Mon, 31 Jul 2006 00:24:33 -0400 To: David Coulson In-Reply-To: <44CD8415.2020403@davidcoulson.net> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org David Coulson wrote: > This machine has four NICs running the e1000 kernel module. Other than > the BUG() messages, it seems to be running fine. I was running 2.6.15.4 > without any issues on the same hardware, although I noticed the e1000 > has been updated (and I went for rc3 since I was hitting the panic in -rc2) > > Now, I'm not sure if it also has anything to do with this message: > > NAT: no longer support implicit source local NAT > NAT: packet src 10.1.1.1 -> dst 207.166.203.131 No, this in unrelated. This message tries to tell you that the old behaviour of changing the source address implicitly to the source address routing would use for a DNATed connection is no longer done. This behaviour changed in 2.6.11, so if everything worked in 2.6.15, you should be fine. > Any suggestions as to how to go about debugging this? > > BUG: warning at net/core/dev.c:1171/skb_checksum_help() > [] skb_checksum_help+0x4d/0xf0 > [] ip_nat_fn+0x4e/0x19e This is a known problem with NAT and HW checksum and will probably get fixed in 2.6.19. The message is just a warning, everything should work fine.