From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: Multiple GRE tunnels on the same host, only one routes incoming packets Date: Sat, 11 Feb 2012 13:55:18 +0100 Message-ID: <1328964918.5661.26.camel@edumazet-laptop> References: <201202111040.q1BAeESi014636@hope.more-right-rudder.com> <1328959799.5661.25.camel@edumazet-laptop> <201202111210.q1BCADqU026660@hope.more-right-rudder.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: Rick Koshi Return-path: Received: from mail-wi0-f174.google.com ([209.85.212.174]:42827 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754649Ab2BKMzZ (ORCPT ); Sat, 11 Feb 2012 07:55:25 -0500 Received: by wics10 with SMTP id s10so2588639wic.19 for ; Sat, 11 Feb 2012 04:55:24 -0800 (PST) In-Reply-To: <201202111210.q1BCADqU026660@hope.more-right-rudder.com> Sender: netdev-owner@vger.kernel.org List-ID: Le samedi 11 f=C3=A9vrier 2012 =C3=A0 07:10 -0500, Rick Koshi a =C3=A9c= rit : > Eric Dumazet writes: > >=20 > > check : > >=20 > > grep . `find /proc/sys -name rp_filter` >=20 > Thank you, thank you, thank you! This is exactly right. > CentOS by default sets reverse-path filtering (which I'd > never even heard of before your message) partially on > (value 1 in /proc/sys/net/ipv4/conf/default/rp_filter). >=20 > In my case, I need it completely off for my 2 tunnel > interfaces. A quick change to my setup script, and > everything works now. >=20 > Thank you so very much. You have saved me hours > of frustration and given me a good night's sleep. :-) >=20 You're very welcome :)