From mboxrd@z Thu Jan  1 00:00:00 1970
From: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
Subject: Re: How would I go about doing this?
Date: Mon, 17 Oct 2005 15:33:20 -0400
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To: "Zane C. B." <zanecb@midwest-connections.com>
Cc: netfilter@lists.netfilter.org

On Mon, 2005-10-17 at 13:37 -0500, Zane C. B. wrote:
> I have two routers. The main router than everything goes through and a
> second router that I want to route some traffic through depending on the
> originating IP#.
> 
> The second router has filtering and the like running on it.
> 
> For traffic coming from a specific IP# and hitting the main router, I
> want it then to be routed out through the second router.
> 
> Currently I got it working for port 80, using iptables, since squid is
> setup transparently on the filtering router. The command I am using is
> this... iptables -t nat -A PREROUTING -s <machine to filter for> -p tcp
> --destination-port 80 -j DNAT --to-destination <filtering router>. This
> works, but only for like web or the like which has a transparent squid
> setup to take care of it.
> 
> That works for right now, but what I want to accomplish is to have the
> main router kick packets, from specified IP#, out to the secondary
> router.
> 
If I understand you correctly, iproute2 is your friend.  You can
probably find the documentation on it in a file in your distribution
named ip-cref.ps.  You can also find a training slide show in the
training section of the ISCS open source network security management web
page (http://iscs.sourceforge.net).  Hope this helps - John
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@opensourcedevel.com

Financially sustainable open source development
http://www.opensourcedevel.com