edit network interface
sudo nano /etc/network/interfaces
as:
auto lo
iface lo inet loopback
iface eth0 inet dhcp
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp
edit wpa supplicant
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
as:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="Your SSID Here"
proto=RSN
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP
psk="YourPresharedKeyHere"
}
start:
sudo ifup wlan0
stop:
sudo ifdown wlan0
http://kerneldriver.wordpress.com/2012/10/21/configuring-wpa2-using-wpa_supplicant-on-the-raspberry-pi/