{{tag>[linux raspbian wifi]}}
=====Raspbian - wifi configuration=====
  * Wifi<->USB: {{::awus036nha.pdf|Alpha AWUS036NHA}}
  * SBC: RaspberryPi B+
  * OS: Raspbian / kernel 3.12.22+
  * Country: The Netherlands

  * Output before, using wrong regulatory domain, channel 12 and 13 are missing: <code># iwlist wlan0 channel
wlan0     11 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Current Frequency:2.462 GHz (Channel 11)
</code>
====Install prerequisites====
  * Install packages: <code>apt-get install crda</code>

====Modify regulatory domain====
  * Edit **/etc/default/crda** <code>REGDOMAIN=NL</code>
  * Reboot
  * Channels after reboot: **iwlist wlan0 channel**<code># iwlist wlan0 channel
wlan0     13 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Current Frequency:2.462 GHz (Channel 11)</code>
====Configure wireless====
  * **/etc/wpa_supplicant/wpa_supplicant.conf **<code>ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="<ssid>"
        bssid=<bssid MAC if needed>
        psk="<psk key>"
        proto=RSN
        key_mgmt=WPA-PSK
        pairwise=CCMP
        auth_alg=OPEN
}</code>
  * **/etc/network/interfaces**<code>auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp</code>

  * Fixing WiFi dropout issues: **/etc/modprobe.d/8192cu.conf** <code># Disable power saving
options 8192cu rtw_power_mgnt=0 rtw_enusbss=1 rtw_ips_mode=1</code>
  * reboot