From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@linux-foundation.org>
Subject: Re: tracking packets through bridge
Date: Wed, 14 Mar 2007 10:58:28 -0700
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To: "Jie Chen" <cj70286@hotmail.com>
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On Wed, 14 Mar 2007 17:50:50 +0000
"Jie Chen" <cj70286@hotmail.com> wrote:

> Hi,
> 
> 
> 
> I got a question about tracking the packets on bridge. I have a few linux 
> boxes set up with bridge and STP running, which has two interfaces enslaved 
> to the bridge, if I want to send packets from one to another, how do I track 
> which interface I'm using to send packets?
> 
> Thanks,
> 
> Jie

Look at the forwarding table:
	brctl showmacs br0