From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philip Craig <philipc@snapgear.com>
Subject: Re: states and UDP
Date: Mon, 06 Mar 2006 11:43:21 +1000
Message-ID: <440B93B9.6060204@snapgear.com>
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To: "T. Horsnell" <tsh@mrc-lmb.cam.ac.uk>
Cc: netfilter@lists.netfilter.org

On 03/04/2006 12:34 AM, T. Horsnell wrote:
> Am I right in thinking that the stateful capabilities
> of iptables (NEW/ESTABLISHED/RELATED etc) only apply to
> tcp connections? If not, how are these states defined for
> udp?
> 
> iptables doesnt complain if I add a rule containing
> '-p udp -m state --state NEW'

Conntrack states are valid for all protocols.
They are different from TCP states.
The man page and tutorial describe what they mean:
http://iptables-tutorial.frozentux.net/iptables-tutorial.html#USERLANDSTATES