[CUWiN-Dev] Monitor mode with Atheros

[David Young]

On Wed, Feb 07, 2007 at 02:21:56PM +0900, Jeongkeun Lee wrote:
> Hi Dave,
> 
> I'd like to have a mesh node to operate as a packet sniffer. The sniffer
> will be placed right next to a sender and sniff out every packet transmitted
> by the sender. We have written codes which read 64-bit hardware timestamp of
> received packets in ath device driver, which is reported to the application
> program (sniffer daemon). 
> 
> The sniffer does not have to transmit packets. But it has to hear every
> packet (from the sender) regardless of the destination address in the
> packet. Thus, the sniffer needs to operate in monitor mode, as I guessed.
> But it seems the device driver needs to be modified to support monitor mode.
> Or there is another way to make a sniffer without using monitor mode?

Promiscuous mode should be sufficient.  tcpdump puts an interface in
promiscuous mode by default.  In adhoc mode, have you tried 'tcpdump
-ne -y ieee802_11_radio -i ath0 -s 256 -w /tmp/capture-file.cap'?
That works for me.

Dave

> Thanks,
> -- Jeongkeun
> 
> > You cannot transmit packets in monitor mode.  It is a receive-only mode.
> > What are you trying to achieve?  I can probably suggest a different way.
> > 
> > Dave
> > 
> > --
> > David Young             OJC Technologies
> > dyoung at ojctech.com      Urbana, IL * (217) 278-3933
> > _______________________________________________
> > CU-Wireless-Dev mailing list
> > CU-Wireless-Dev at lists.cuwireless.net
> > http://lists.chambana.net/cgi-bin/listinfo/cu-wireless-dev

-- 
David Young             OJC Technologies
dyoung at ojctech.com      Urbana, IL * (217) 278-3933