From: Steven Kath <steven.kath@vyatta.com>
To: Pandu Poluan <pandu@poluan.info>
Cc: netfilter@vger.kernel.org
Subject: Re: Question on raw table and match state
Date: Fri, 11 Feb 2011 10:01:41 -0800 (PST) [thread overview]
Message-ID: <1426981515.473.1297447301826.JavaMail.root@tahiti.vyatta.com> (raw)
In-Reply-To: <1233805814.468.1297447131465.JavaMail.root@tahiti.vyatta.com>
----- "Pandu Poluan" <pandu@poluan.info> wrote: -----
> I am wondering if the following rule will work:
>
> iptables -t raw -A PREROUTING -p icmp -m state --state
> RELATED,ESTABLISHED -j ACCEPT
>
If you look at Jan's Netfilter packet flow diagram, you'll see that the raw PREROUTING chain is traversed before the conntrack functions are called. State can not be determined until after the packet is compared to the conntrack table. The rule you described can't work and I think the iptables binaries won't allow it to be created.
http://jengelh.medozas.de/images/nf-packet-flow.png
next parent reply other threads:[~2011-02-11 18:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1233805814.468.1297447131465.JavaMail.root@tahiti.vyatta.com>
2011-02-11 18:01 ` Steven Kath [this message]
2011-02-12 2:14 ` Question on raw table and match state Pandu Poluan
2011-02-12 3:27 ` [patch] warn on use of ctstate checking in raw Jan Engelhardt
2011-02-14 16:29 ` Patrick McHardy
2011-02-11 7:46 Question on raw table and match state Pandu Poluan
2011-02-11 8:06 ` Pandu Poluan
2011-02-11 8:15 ` Jozsef Kadlecsik
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