From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sorin Panca <sorin.panca@gmail.com>
Subject: Re: iptables: No chain/target/match by that name (detailed)
Date: Fri, 13 Jan 2006 01:31:59 +0200
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References: <s3c4d304.069@gwia201.syr.edu>
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Hi Amresh Kumar!
The PREROUTING and POSTROUTING chains exist only in nat or mangle
tables. So add iptables -t nat or iptables -t mangle

> iptables rule :  iptables  -A PREROUTING -i eth0 -p tcp --dport 80 -m state 
> --state NEW -m nth --counter 0 --every 4 --packet 0  -j DNAT 
> --to-destination 192.168.0.5:80
> 
> iptables -A PREROUTING -i eth0 -p tcp --dport 80 -m state --state NEW -m 
> random --average 25 -j DNAT --to-destination 192.168.0.5:80
> 
> 

The above rules would be for the nat table.
HTH
Sorin