Driftnet only captures localhost

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http://www.backtrack-linux.org – I am trying to get driftnet working on my wireless lab. I had it working earlier but now can't get it to work. I am trying to document the process. My lab consists of an open wifi network. I have joined my BT5 R3 machine so that it has network access on the "labwifi". I've created my monitor interface using airmon-ng start wlan0 and verified the interface has been created. Do I run drifnet on the wlan0 or mon0 interface? So far, if I run driftnet -i wlan0 it only captures my localhost traffic. If I run driftnet -i mon0 it gives me an error: driftnet: unknown data link type (HowTos)