From mboxrd@z Thu Jan  1 00:00:00 1970
From: Guido Lorenzutti <guido@lorenzutti.com.ar>
Subject: travelling the tables and chains...
Date: Sun, 03 Apr 2005 23:25:42 -0300
Message-ID: <4250A5A6.6040509@lorenzutti.com.ar>
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Hi people, i would like to clean up my firewall script by creating new 
chains in the filter table. Like this:

iptables -N FORWARD_WAN_TO_LAN

Then, call the traffic in the FORWARD chain:

iptables -A FORWARD -i $WAN -o $LAN -j FORWARD_WAN_TO_LAN

Now how can i discriminate the DNATed packets from that rule? It's OK if 
i MARK them in the PREROUTING chain and create a rule BEFORE in the 
FORWARD chain to check if the packet im MARKed then -j DNATED_WAN_TO_LAN?

Any better ideas?