http://www.wirelessdefence.org/Contents/LinuxWirelessCommands.htm

Note: To connect your Linux machine to a WLAN using WPA, WPA2 or 802.1X you will need to use WPA Supplicant

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Note: replace [interface] with your interface name as required (e.g. eth1, wlan0, ath0 etc.)

iwconfig [interface] mode managed key [WEP key] (128 bit WEP use 26 hex characters, 64 bit WEP uses 10)

iwconfig essid “[ESSID]” (Specify ESSID for the WLAN)

dhclient [interface] (to receive an IP address, netmask, DNS server and default gateway from the Access Point)

ping http://www.bbc.co.uk (if you receive a reply you have access)