From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: Re: [PATCHv7 4/4] netfilter: bridge: forward IPv6 fragmented packets Date: Fri, 12 Jun 2015 14:26:22 +0200 Message-ID: <20150612122622.GG13530@salvia> References: <1432992616-4195-1-git-send-email-bernhard.thaler@wvnet.at> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kadlec@blackhole.kfki.hu, netfilter-devel@vger.kernel.org, fw@strlen.de To: Bernhard Thaler Return-path: Received: from mail.us.es ([193.147.175.20]:55803 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755218AbbFLMVJ (ORCPT ); Fri, 12 Jun 2015 08:21:09 -0400 Content-Disposition: inline In-Reply-To: <1432992616-4195-1-git-send-email-bernhard.thaler@wvnet.at> Sender: netfilter-devel-owner@vger.kernel.org List-ID: On Sat, May 30, 2015 at 03:30:16PM +0200, Bernhard Thaler wrote: > IPv6 fragmented packets are not forwarded on an ethernet bridge > with netfilter ip6_tables loaded. e.g. steps to reproduce > > 1) create a simple bridge like this > > modprobe br_netfilter > brctl addbr br0 > brctl addif br0 eth0 > brctl addif br0 eth2 > ifconfig eth0 up > ifconfig eth2 up > ifconfig br0 up > > 2) place a host with an IPv6 address on each side of the bridge > > set IPv6 address on host A: > ip -6 addr add fd01:2345:6789:1::1/64 dev eth0 > > set IPv6 address on host B: > ip -6 addr add fd01:2345:6789:1::2/64 dev eth0 > > 3) run a simple ping command on host A with packets > MTU > > ping6 -s 4000 fd01:2345:6789:1::2 > > 4) wait some time and run e.g. "ip6tables -t nat -nvL" on the bridge > > IPv6 fragmented packets traverse the bridge cleanly until somebody runs. > "ip6tables -t nat -nvL". As soon as it is run (and netfilter modules are > loaded) IPv6 fragmented packets do not traverse the bridge any more (you > see no more responses in ping's output). > > After applying this patch IPv6 fragmented packets traverse the bridge > cleanly in above scenario. Applied, thanks Bernhard.