netdev - Re: [iproute2] tc action mirred question

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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


      
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html