netdev - Re: two gateways with one NIC

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Date:	Mon, 09 Apr 2007 18:13:50 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	W Agtail <wagtail@....ie>, netdev@...r.kernel.org
Subject: Re: two gateways with one NIC

Lennart Sorensen wrote:
> On Mon, Apr 09, 2007 at 04:56:20PM +0100, W Agtail wrote:
> 
>>Hi there, and thanks v. much for getting back to me on this one.
>>I now have changed iptables on the web servers to the following:
>>
>>iptables -t mangle -A POSTROUTING -p tcp --sport 8088 -o eth0 -j MARK
>>--set-mark 1
>>iptables -t mangle -A POSTROUTING -p tcp --sport 8089 -o eth0 -j MARK
>>--set-mark 2
>>
>>But I'm still seeing traffic being returned via gw2 for port 8088 :(
>>Any ideas? Thanks.
> 
> 
> Hmm, I know I have done something like this before (I made all port 80
> traffic return through another host rather than the default gateway, but
> it was about 3 years ago and I don't remember the exact syntax).


As the name suggests, POSTROUTING comes after routing, so marking
packets there doesn't affect routing. Use PREROUTING for forwarded
traffic and OUTPUT for locally generated traffic.

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