/etc/network/interfaces
allow-auto wlan0
iface wlan0 inet dhcp
allow-auto lo
iface lo inet loopback
wpa-conf /etc/wpa_supplicant/config



/etc/wpa_supplicant/config
network={
ssid="ssid"
psk="password"
}




# ifup wlan0
...
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
No DHCPOFFERS received.
No working leases in persistent database - sleeping.