From mboxrd@z Thu Jan  1 00:00:00 1970
From: Antony Stone <Antony@Soft-Solutions.co.uk>
Subject: Re: 3 outside networks
Date: Mon, 17 Jun 2002 19:22:45 +0100
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On Monday 17 June 2002 7:13 pm, Antony Stone wrote:

> On Monday 17 June 2002 3:34 pm, Srinath Mantripragada wrote:
> > I have one inside net 172.16.0.0/24  and 3 outside nets  10.28.0.0/16 ,
> >    172.18.0.0/24 and Internet.
> > The 3 nets are routed by one router that i do not have control.
> >
> > I have valid internet Addresses and i want to use NAT with one of them
> > but not for 10.28 and 172.18 networks.
> >
> > I guess that i need something like :   "-d  ! 10.28.0.0/16  OR !
> > 172.18.0.0./24"
> > but i dont  know how  to do that.
>
> Try this:
>
> iptables -A POSTROUTING -t nat -d 10.28.0.0/16 -j ACCEPT
> iptables -A POSTROUTING -t nat -d 172.18.0.0/24 -j ACCEPT
> iptables -A POSTROUTING -t nat -j SNAT --to a.b.c.d

Ooops !   That last one should inlcude the interface name too:

iptables -A POSTROUTING -t nat -o eth1 -j SNAT --to a.b.c.d

 

Antony.