From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Schillstrom Subject: Re: [PATCH 1/1] netfilter: Add possibility to turn off netfilters defrag per netns Date: Wed, 4 Jan 2012 09:49:53 +0100 Message-ID: <201201040949.54985.hans.schillstrom@ericsson.com> References: <1325664443-10320-1-git-send-email-hans.schillstrom@ericsson.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: Patrick McHardy , Pablo Neira Ayuso , "jengelh@medozas.de" , "netfilter-devel@vger.kernel.org" , "netdev@vger.kernel.org" , "hans@schillstrom.com" To: Jozsef Kadlecsik Return-path: Received: from mailgw10.se.ericsson.net ([193.180.251.61]:55802 "EHLO mailgw10.se.ericsson.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751275Ab2ADIt5 (ORCPT ); Wed, 4 Jan 2012 03:49:57 -0500 In-Reply-To: Content-Disposition: inline Sender: netfilter-devel-owner@vger.kernel.org List-ID: Hello Jozsef On Wednesday 04 January 2012 09:28:05 Jozsef Kadlecsik wrote: > Hi Hans, > > On Wed, 4 Jan 2012, Hans Schillstrom wrote: > > > In some cases it not desirable to have auto defrag. > > Ex. in a cluster where packets can arrive on different blades. > > In that case it is possible to use containers (LXC) and send > > all fragments to one place where defrag is enabled. > > > > This patch makes it possible to turn off the defrag per network name space, > > by setting net.netfilter.nf_conntrack_nodefrag to 1. > > Both IPv4 and IPv6 is effected by this sysctl. > > Default is 0 which is defrag. > > Conntrack assumes that the packets are defragmented and will drop any > unfragmented one. So your patch results packet drops. Hmmm, more work... > > Also, if you want to disable defragmentation then why don't you simply > "mark" the packets with the NOTRACK target? I don't think that will work since NF_IP_PRI_CONNTRACK_DEFRAG is -400 > > Best regards, > Jozsef > -- Regards Hans Schillstrom