From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Jones Subject: broken nat on linus' latest tree. Date: Wed, 25 Jul 2012 13:44:33 -0400 Message-ID: <20120725174433.GA4462@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:52228 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751219Ab2GYRoh (ORCPT ); Wed, 25 Jul 2012 13:44:37 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q6PHiavf004534 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 25 Jul 2012 13:44:37 -0400 Received: from gelk.kernelslacker.org (ovpn-112-42.phx2.redhat.com [10.3.112.42]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q6PHiYUK026363 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 25 Jul 2012 13:44:36 -0400 Received: from gelk.kernelslacker.org (localhost [127.0.0.1]) by gelk.kernelslacker.org (8.14.5/8.14.5) with ESMTP id q6PHiXKG005670 for ; Wed, 25 Jul 2012 13:44:33 -0400 Received: (from davej@localhost) by gelk.kernelslacker.org (8.14.5/8.14.5/Submit) id q6PHiXfB005668 for netdev@vger.kernel.org; Wed, 25 Jul 2012 13:44:33 -0400 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: I put Linus' latest tree on my firewall, and found that none of the machines in my house can talk to the net any more. The setup is pretty basic. eth0 talks to the cable modem, eth1 talks to lan. ip masq between them. Running tcpdump, when I run a ping from another machine to the internet, I see icmp requests arriving on eth1. I see those requests and their replies going in/out of eth0, but I don't see the replies being forwarded back to eth1. (It happens with all traffic, not just icmp). 3.5 works, this is a post-merge regression. Any ideas ? Dave