RPi Easy SD Card Setup - eLinux.org

# Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
# /usr/share/doc/ifupdown/examples for more information.
auto lo
iface lo inet loopback
iface eth0 inet dhcp
# The wireless interface
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa.conf
or
▪ Plug in adapter
▪ Confirm adapter is present:
root@raspberrypi:~# sudo iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
▪ Scan your network to see what wireless access points can be seen. You may need to
do this to identify your network's SSID (name), but it also confirms that the wifi
dongle is doing something. The first command just lists the SSIDs found, the second
tells you probably more than you ever want to know:
sudo iwlist wlan0 scan | grep ESSID
sudo iwlist wlan0 scan
▪ Create the wpa.conf file - eg: sudo vi /etc/wpa.conf:
Note: The ssid is case sensitive - if your WLAN's SSID is MYLAN, using "mylan"
will not work - you won't connect!
network={
ssid="NETWORK-SSID"
proto=RSN
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP
psk="YOUR-WLAN-PASSWORD"
}