From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Simon Garner" <sgarner@expio.co.nz>
Subject: Re: NAT with two Internet links
Date: Thu, 16 Oct 2003 20:45:37 +1300
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On Thursday, October 16, 2003 7:37 PM [GMT+1200=NZT],
Simon Garner <sgarner@expio.co.nz> wrote:

> Hi,
>
> I have a small network with several Windows client PCs, a Linux
> firewall/server, and two links to the Internet. What I want to do is
> have certain traffic (based on source and/or destination ports) routed
> through one link while everything else goes through the other.
>

Nevermind, after a bit more googling I found the answer myself. The
solution is to mark the wanted packets with iptables and then route them
with iproute2, as per:
http://www.lartc.org/howto/lartc.netfilter.html

-Simon