WLAN capture in Mac OSX - no IP packets

[Alexandre Takacs <admin () mobile-mail ch>]

Folks

Relatively new to wireshark - please bear with me if I am missing something obvious.

I'd like to do packet capture on my WiFi network (which I have joined). I am only interested in data packets 
(specifically traffic form my iPhone).

I've installed WireShark and managed to have capture running in promiscuous mode. However I only see UDP packets from 
other devices, no IP...

Wha'ts up ?! 

Any help / pointer most welcome

Regards

alex
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