Raspberry Pi WiFi configuration

Here’s a short tutorial on how to quickly setup WiFi on your RasPi.
I’m using Atheros based TP-LINK TL-WN721N USB adapter – good and cheap.

You can skip firmware-related steps if your card doesn’t need it (like Realtek-based TL-WN725N).

1. Download firmware from: http://linuxwireless.org/download/htc_fw/1.3/htc_9271.fw
2. Copy firmware file to /lib/firmware
3. Install wireless-tools and wpasupplicant
4. Create /etc/wpa_supplicant.conf file:

   ctrl_interface=/var/run/wpa_supplicant
   ctrl_interface_group=0
   
   # WPA2-PSK network
   network={
     ssid="network_name"
     scan_ssid=1
     proto=WPA2
     key_mgmt=WPA-PSK
     pairwise=CCMP TKIP
     group=CCMP TKIP
     psk=encrypted_key # generate using wpa_passphrase
   }
   
   # Simple WEP protected network
   network={
     ssid="network_name"
     key_mgmt=NONE
     wep_key0=your_wep_key
     wep_tx_keyidx=0
     priority=5
   }
   

5. Edit /etc/network/interfaces and add:

   auto wlan0
   iface wlan0 inet dhcp
   pre-up wpa_supplicant -Dwext -i wlan0 -c /etc/wpa_supplicant.conf -B
   

6. Restart networking or reboot:

   # service networking restart