[CUWiN-Dev] Minitor mode with Atheros

[Jeongkeun Lee]

Hi, 

 

As I'm trying to use one mesh node as a packet sniffer, I have been testing
the monitor mode and resulted in some problem. I'm using cuwin-0.6.0 and the
Atheros driver in the corresponding cuwin-0.6.0 netbsd source. 

 

In ifconfig.backhaul.tmpl, the 'adhoc' media opt was changed to 'monitor' as
follows:

media auto mediaopt adhoc mode 11a

 

When I reboot the node, I encounter the continuous error messages:
'ath_start: encapsulation failure' and the ath0 interface does not work.

 

The madwifi wiki site reports that:

(http://madwifi.org/wiki/UserDocs/MonitorModeInterface)

***************************

By default, monitor mode receives packets with prism2 headers prepended on
them. To change this, you must run one of the following: 

 

Only 802.11 headers: echo '801' > /proc/sys/net/ath0/dev_type 

Prism2 headers: echo '802' > /proc/sys/net/ath0/dev_type 

Radiotap headers: echo '803' > /proc/sys/net/ath0/dev_type 

Atheros Descriptors: echo '804' > /proc/sys/net/ath0/dev_type

***************************

 

I wonder this prism2 header causes the 'encapsulation failure' problem. 

If so, how can it be changed..?

I can not find such dev_type file or something similar. 

 

Thank you so mush as always.

 

-- Jeongkeun

 

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