From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751054Ab2JFNxl (ORCPT ); Sat, 6 Oct 2012 09:53:41 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:60083 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750712Ab2JFNxk (ORCPT ); Sat, 6 Oct 2012 09:53:40 -0400 Subject: Re: [REGRESSION] Kernel 3.6 drops network packets instead of forwarding From: Eric Dumazet To: "Chini, Georg (HP App Services)" Cc: "linux-kernel@vger.kernel.org" In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Date: Sat, 06 Oct 2012 15:53:36 +0200 Message-ID: <1349531616.21172.1069.camel@edumazet-glaptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2012-10-06 at 11:52 +0000, Chini, Georg (HP App Services) wrote: > Hello, > > I have a network issue with kernel 3.6. My machine is set > up as router and with 3.6 it sometimes silently drops reply > packets instead of forwarding. > Example tcpdump on the router for ping www.heise.de from a > machine in my network (NAT is done elsewhere): > > 12:37:54.746627 IP 192.168.255.150 > 193.99.144.85: ICMP echo request, id 16414, seq 1, length 64 (eth0) > 12:37:54.746681 IP 192.168.255.150 > 193.99.144.85: ICMP echo request, id 16414, seq 1, length 64 (GRE tunnel) > 12:37:54.782195 IP 193.99.144.85 > 192.168.255.150: ICMP echo reply, id 16414, seq 1, length 64 (GRE tunnel) > 12:37:54.782335 IP 193.99.144.85 > 192.168.255.150: ICMP echo reply, id 16414, seq 1, length 64 (eth0) > 12:37:55.785974 IP 192.168.255.150 > 193.99.144.85: ICMP echo request, id 16416, seq 1, length 64 (eth0) > 12:37:55.786023 IP 192.168.255.150 > 193.99.144.85: ICMP echo request, id 16416, seq 1, length 64 (GRE tunnel) > 12:37:55.822529 IP 193.99.144.85 > 192.168.255.150: ICMP echo reply, id 16416, seq 1, length 64 (GRE tunnel) > NO forwarded packet on eth0 > > Then this goes on for an arbitrary period (between a few seconds and > more then half an hour) and suddenly returns to normal. During that > time no communication is possible between a host on my network and > any external host. Connections from the router itself still work. > With kernel 3.4.3 everything works fine. Had the same issue with > -rc6 and -rc7. > > There are no messages in the logs. Any idea what might cause this > or how I can debug it any further? > I will supply more details on my setup if needed. Please CC me in > your reply as I am not subscribed to the list. Looks like the bug fixed by : http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=f4ef85bbda96324785097356336bc79cdd37db0a (David Miller will send it to stable team shortly)