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I've tested this on Ubuntu 7.10 Gutsy Gibbon - x86 architecture - 32 Bit, but I don't see why it shouldn't work on other OS's.
You need a Internet Connection with your LAN Cabel.
Open a Terminal and type…
sudo apt-get install build-essential sudo apt-get install libssl-dev
wget http://dl.aircrack-ng.org/drivers/ipwraw-ng-2.3.4-04022008.tar.bz2 tar -xjf ipwraw-ng* cd ipwraw-ng make sudo make install sudo make install_ucode echo "blacklist ipwraw" | sudo tee /etc/modprobe.d/ipwraw sudo depmod -ae
The device created will automatically be in monitor mode.
sudo modprobe -r ipw3945 sudo modprobe ipwraw
Configure your Wireless Card
The device name must not “eth1” it can be “wifi0” or what ever. You can see this with “iwconfig”.
ubuntu@ubuntu:~$ iwconfig lo no wireless extensions. eth0 no wireless extensions. eth1 unassociated ESSID:off/any Mode:Monitor Channel=11 Bit Rate=1 Mb/s
You can use iwconfig to set the channel and rate and transfer power.
iwconfig eth1 channel 11 (on which you want to sniff) iwconfig eth1 rate 1M (min=1M and max=54M) iwconfig eth1 txpower 16 (min=-12 and max=16)
And when you're done,
sudo modprobe -r ipwraw sudo modprobe ipw3945
At this point in time, this page is far from complete. In the interim, useful information will be included here. Also do a Forum Search for additional information.
Also consider using the Wifi-Way live CD instead.