From: Hans Schillstrom <hans.schillstrom@ericsson.com>
To: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: Patrick McHardy <kaber@trash.net>,
Pablo Neira Ayuso <pablo@netfilter.org>,
"jengelh@medozas.de" <jengelh@medozas.de>,
"netfilter-devel@vger.kernel.org"
<netfilter-devel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"hans@schillstrom.com" <hans@schillstrom.com>
Subject: Re: [PATCH 1/1] netfilter: Add possibility to turn off netfilters defrag per netns
Date: Wed, 4 Jan 2012 09:49:53 +0100 [thread overview]
Message-ID: <201201040949.54985.hans.schillstrom@ericsson.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1201040922020.925@blackhole.kfki.hu>
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 <hans.schillstrom@ericsson.com>
next prev parent reply other threads:[~2012-01-04 8:49 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-04 8:07 [PATCH 1/1] netfilter: Add possibility to turn off netfilters defrag per netns Hans Schillstrom
2012-01-04 8:28 ` Jozsef Kadlecsik
2012-01-04 8:49 ` Hans Schillstrom [this message]
2012-01-04 9:03 ` Jozsef Kadlecsik
2012-01-04 9:32 ` Jan Engelhardt
2012-01-04 9:47 ` Hans Schillstrom
2012-01-04 17:23 ` Pablo Neira Ayuso
2012-01-04 9:49 ` Jozsef Kadlecsik
2012-01-04 10:18 ` Hans Schillstrom
2012-01-04 11:17 ` Jan Engelhardt
2012-01-04 11:48 ` Hans Schillstrom
2012-01-04 17:40 ` Pablo Neira Ayuso
2012-01-04 18:05 ` Jozsef Kadlecsik
2012-01-04 20:56 ` Hans Schillstrom
2012-01-04 21:40 ` Jozsef Kadlecsik
2012-01-05 7:19 ` Hans Schillstrom
2012-01-05 9:11 ` Jozsef Kadlecsik
2012-01-05 14:18 ` Pablo Neira Ayuso
2012-01-09 8:58 ` Hans Schillstrom
2012-01-10 3:17 ` Pablo Neira Ayuso
2012-01-04 20:45 ` Hans Schillstrom
2012-01-04 21:15 ` Hans Schillstrom
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