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

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Message-ID: <4AE30D01.7030700@lemonia.org>
Date:	Sat, 24 Oct 2009 15:19:45 +0100
From:	Dunc <dunc@...onia.org>
To:	Luca Dionisi <luca.dionisi@...il.com>
CC:	netdev@...r.kernel.org, linux-net@...r.kernel.org
Subject: Re: Request: how do packet routing based on input gateway

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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