[kismac] problems trying to get a WEP key

Hi,
I am using Kismac R88, I have a airport extreme card on my ibook and a "macwireless 11b USB adapter" plugged in.
I use the "apple airport extreme card, passive mode" and "usb device with prism chipset, passive mode" (although I don't know what chipset is used by my usb device".
after different problems I could make deauthanticate flood and reinject packets but after 5 minutes I had only 90 Data Packets and Unique IVs and 3 inj packets.
Is there anything I forgot to do or did wrong ?
How am I supposed to do to get a WEP key with my config ?
I am a newbie.
thanks.
K


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