Using the WNA3100M netgear adapter

nano /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="your_ssid"
    scan_ssid=1
    psk="your_password"
    proto=RSN
    key_mgmt=WPA-PSK
    pairwise=CCMP
    auth_alg=OPEN
}

knowing that :

• ssid: your wifi name
• scan_ssid: value of 1 means broadcast and value of 2 means hidden (suggest you enter value of 1)
• psk: your wifi password
• proto: your choice of RSN or WPA. RSN is WP2 and WPA is WPA1. (most config is RSN)
• key_mgmt: your choice of WPA-PSK or WPA-EAP (pre-shared or enterprise respectively)
• pairwise: your choice of CCMP or TKIP ( WPA2 or WPA1 respectively)
• auth_alg: OPEN option is required for WPA and WPA2 (other option, SHARED & LEAP)

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=30348 http://databoyz.wordpress.com/tag/how-to-setup-network-and-wpa_supplicant-conf-file-on-raspberry-pi/