From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anthony Liu <anthony@nexus-online.com>
Subject: Re: Purely NAT
Date: Tue, 29 Oct 2002 02:37:55 +0800
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To: Antony Stone <Antony@Soft-Solutions.co.uk>
Cc: Netfilter Mailing List <netfilter@lists.samba.org>

On Mon, 28 Oct 2002 14:44:43 +0000 Antony Stone <Antony@Soft-Solutions.co.uk> wrote:

> On Monday 28 October 2002 5:32 am, yenjet.chan@eglobal.com.my wrote:
> 
> > Hi all,
> >
> > This is my first post to the list, so please bare with me.
> > I have a requirement here. Is there possible to create a purely NAT
> > iptables rules for certain IP addresses?
> 
> No.   You can turn off stateful inspection by not loading or compiling the 
> connection tracking support, but you cannot use it for some addresses but not 
> others.

Are you sure? By not using "-m state" it might actually work, how about:
iptables -A FORWARD -o ppp0 -s aaa.bbb.ccc.eee -j ACCEPT
iptables -A FORWARD -o ppp0 -s aaa.bbb.ccc.ddd -m state --state ! INVALID -j ACCEPT