netdev - Re: [iproute2] tc action mirred question

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Message-ID: <749852.6581.qm@web111606.mail.gq1.yahoo.com>
Date:	Mon, 7 Sep 2009 05:38:49 -0700 (PDT)
From:	Xiaofei Wu <xiaofei_wu08@...oo.com>
To:	hadi@...erus.ca
Cc:	linux netdev <netdev@...r.kernel.org>
Subject: Re: [iproute2] tc action mirred    question





>> 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? ;-> 

I am sorry.
Maybe it is very easy for you. But I didn't find enough documents(or examples) about 'tc' to help me.
I just want to know:
1) Could I forward the mirroring packets to another node ,and then route it to the destination(if I use 
iproute2 (ip, tc ...)  )?  I described my purpose in my last email.
2)  After I mirrored the packets, I should use 'ip route' , 'ip rule' to modify route tables.  Is this right?

>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

Would this cause loops?


>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.


Regards,
Wu


      
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