From mboxrd@z Thu Jan  1 00:00:00 1970
From: "David S. Miller" <davem@davemloft.net>
Subject: Re: determine outgoing interface (eth0,eth1) for a packet
 according to the dest IP
Date: Tue, 25 Apr 2006 00:58:31 -0700 (PDT)
Message-ID: <20060425.005831.64868698.davem@davemloft.net>
References: <ada605fb0604250031r2e4a74e7id0b5079fabde9517@mail.gmail.com>
	<200604250943.49422.ak@suse.de>
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From: Andi Kleen <ak@suse.de>
Date: Tue, 25 Apr 2006 09:43:49 +0200

> On Tuesday 25 April 2006 09:31, John Que wrote:
> > Hello,
> > What is the right way to determine on which interface card
> > (eth0 or eth1) will a packet be sent (according to the dest IP)?
> 
> You can send a rtnetlink RTM_GETROUTE message to ask the kernel.
> Result is the interface index in RTA_OIF, which can be converted
> into a name.

That scheme does not handle netfilter nor packet scheduler
classifier mangling and redirection of the packet.