netdev - Re: [iproute2] tc action mirred question

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Message-Id: <1252260806.4580.6.camel@dogo.mojatatu.com>
Date:	Sun, 06 Sep 2009 14:13:26 -0400
From:	jamal <hadi@...erus.ca>
To:	Xiaofei Wu <xiaofei_wu08@...oo.com>
Cc:	linux netdev <netdev@...r.kernel.org>
Subject: Re: [iproute2] tc action mirred    question

On Sun, 2009-09-06 at 10:13 -0700, Xiaofei Wu wrote:


> On node A,
> wlan0, IP address 192.168.1.1/24 ; wlan1, IP address 192.168.2.1/24
> I use command 'tc filter add dev wlan0 ... match ip src 192.168.1.0/24 ...
> action mirred egress mirror dev wlan1' to mirror packets.
> When I use 'tcpdump -i wlan1', I can 'see' the packets  'A(wlan0)->B' (node B will forward them to C). 
> How to forward the mirroring packets 'A(wlan1)' to D (then, node D forwards them to C) ?
> 
> 


Is there a trick to this question or is it too basic? ;-> 
You should repeat the same on wlan1 to mirror to wlan0 i.e on wlan1:
match ip src 192.168.2.0/24 ...
action mirred egress mirror dev wlan0

Note the  node C will receive "wrong" src mac addresses on those
interfaces; you may want to correct/edit them first before you send them
out. Look at using the pedit action.

cheers,
jamal

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