netdev - Re: [iproute2] tc action mirred question

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Date:	Wed, 16 Sep 2009 08:28:19 -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 Mon, 2009-09-14 at 06:44 -0700, Xiaofei Wu wrote:

> On node A I run 'ping 192.168.1.215'(IP addr of node C eth0) on node A, one request 'only' get one reply. It's strange.
> On node B,
> window1:  'tcpdump -i wlan1 -n -e', I can see the mirroring packets.
> window2:  'tcpdump -i wlan2 -n -e', I see noting.
> It seems that node B didn't forward the mirroring packects. So I did anotner experiment to check it. 
> I am sure node B can forward packets. But it didn't forward the mirroring packets, why?  (something wrong 
> with the mirroring packets?)
> 

Please put some effort - these are things you can resolve on your
own. Many possibilities on node B:

- run netstats to see forwarding stats
- run ping from node B to .215 to see if you can reach it.
- check ARP tables
- add explicit route to .215
- check rpfilter

cheers,
jamal

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