Re: Request: how do packet routing based on input gateway

From: Dunc
Date: Sat Oct 24 2009 - 10:59:30 EST


If both of your last hops are on the same subnet you can't use incoming
interface, so the only thing I can think of is to match the MAC address
of the ethernet frame. If the last hop wasn't the source of the packet I
don't think there's anything else to uniquely identify it.

Cheers,

Dunc


Luca Dionisi wrote:
> Hi all
>
> I must instruct my server to route packets based on destination prefix
> and on the gateway from which the packet arrived.
> E.g.
> I am 192.168.0.1
> a packet for 192.168.1.0/24 which arrived from gateway 192.168.0.2
> must go through 192.168.1.1 dev eth0
> a packet for 192.168.1.0/24 which arrived from gateway 192.168.0.3
> must go through 192.168.1.2 dev eth1
> a packet for 192.168.1.0/24 which arrived from any other gateway must
> go through 192.168.1.3 dev eth2
>
> The gateway I mean is just the last hop traversed, before me. It's not
> necessarily the source of the packet.
>
> How am I supposed to do that?
>
> Regards.
> Luca Dionisi
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