These are my experiences in attempting to crack WEP over 802.11b. Keep in mind it is unethical and most likely illegal to do this to any network that you do not own or have express written permission to attack.
I started out using ubuntu and installing some security tools from the repositories. I imediately learned that I needed to patch the orinoco drivers to enable the monitoring mode for my wireless card. You can find instructions on how to do that at the kismet website: http://www.kismetwireless.net/HOWTO-orinoco-drivers.txt.
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