If using the Fn+F2 fails to restart the wireless adapter, try this:

echo "0 or 1" > /proc/acpi/asus/wlan

Use 0 to turn it off and 1 to turn it on.

Use iwconfig to set the SSID

sudo iwconfig wlan0 essid My-SSID

If you do not get an IPv4 address

sudo dhclient wlan0

– Main.FredPettis - 11 Dec 2008