Re: Two gateways on same network
On Thu, Dec 07, 2006 at 04:57:03PM +0200, Hans du Plooy wrote:
> Hi guys,
>
> I'm setting up a Debian antispam mail relay. I have two gateways on the
> network (two separate internet connections):
>
> 4mbit ADSL = 192.168.1.6
> 128k line = 192.168.1.1
>
> Both have NAT firewalls, both forward port 25 to the Debian box. I'm
> trying to do the following:
>
> Always use 192.168.1.6 as the default gateway, except when:
>
> 1. Connections are received via 192.168.1.1. Because if it doesn't
> reply via the same gateway, the connection just times out.
>
> 2. 192.168.1.6's connection goes down, for whatever reason.
>
> So basically the leased line would be a backup MX.
>
> I have put two network cards in, both with IPs on the same network, but
> with different gateways specified in /etc/network/interfaces. But for
> some reason both try to use 192.168.1.1 as the gateway, regardless.
>
> If the second network card is not necessary, that would be OK too.
>
Use shorewall and read the Multi-ISP howto available on
http://shorewall.net.
Regards,
-Roberto
--
Roberto C. Sanchez
http://people.connexer.com/~roberto
http://www.connexer.com
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