From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: Possible networking regression in 3.6.0 Date: Mon, 01 Oct 2012 22:04:44 +0200 Message-ID: <1349121884.12401.721.camel@edumazet-glaptop> References: <506955F3.8050304@googlemail.com> <1349082950.12401.669.camel@edumazet-glaptop> <20121001193434.GA14236@redhat.com> <20121001.160115.1816241312626722150.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: davej@redhat.com, chris2553@googlemail.com, netdev@vger.kernel.org, gpiez@web.de To: David Miller Return-path: Received: from mail-bk0-f46.google.com ([209.85.214.46]:47983 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751776Ab2JAUEt (ORCPT ); Mon, 1 Oct 2012 16:04:49 -0400 Received: by bkcjk13 with SMTP id jk13so5178095bkc.19 for ; Mon, 01 Oct 2012 13:04:48 -0700 (PDT) In-Reply-To: <20121001.160115.1816241312626722150.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 2012-10-01 at 16:01 -0400, David Miller wrote: > From: Dave Jones > Date: Mon, 1 Oct 2012 15:34:34 -0400 > > > On Mon, Oct 01, 2012 at 11:15:50AM +0200, Eric Dumazet wrote: > > > > > > > > $ netstat -s > > > > Icmp: > > > > 4 ICMP messages received > > > > 4 input ICMP message failed. > > > > ICMP input histogram: > > > > echo replies: 4 > > > > > > So icmp replies come back and are delivered to host instead of being > > > forwarded. > > > > > > I wonder if MASQUERADE broke... > > > > I hit something that sounds just like this a few months back.. > > http://lists.openwall.net/netdev/2012/07/25/53 > > > > It "went away" a few builds later, but I've seen it happen > > again from time to time. > > Yep I remembe that report. > > If you can find a way to more reliably trigger the case, that would > help us immensely. I am building a KMEMCHECK kernel, as a last try before my night ;)