Hey Poet,

What make/model is your USB Wifi Adapter?

Also cracking WEP is dependent on the number of weak IV's if using Aircrack-NG, You should not need more than 200k, although I've done it will around a 100k. Use Aireplay or Dsniff's macof to generate traffic so that you can accelerate the capture of the weak IV's.

Aircrack-ptw is a more efficient implementation of the FMS-style attack. It should only take you about a minute with this.

Your card should not affect the speed of cracking WEP though.

My setup is Gentoo on an IBM X41 and I use the ubiquti 300mw card with external antenna.

http://ubnt.com/super_range_cardbus.php4

Cheers,
Dean

I have had very good success with my Ubiquiti card.  As mentioned, the real key is how much traffic and how many IVs are being transmitted. Some networks are so alive you can just sit there with an old program like Airsnort and collect enough in a reasonable amount of time.  Thats on the rare side. Most smaller networks require injecting packets and thats crucial for your card to have that ability.