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= 無線網路設定 =
 * WPA 密碼設定：
   * 設定檔：/etc/network/interfaces
{{{
# allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet static
    address 10.1.2.20
    netmask 255.255.255.0
    network 10.1.2.0
    gateway 10.1.2.1
}}}
   * 使用 DHCP 設定 IP：
{{{
# allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp
}}}
   * 手動設定 IP 設定檔：/etc/wpa_supplicant/wpa_supplicant.conf
{{{
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"
}
}}}
   * 重新啟動無線網路。
{{{
# sudo ifdown wlan0
# sudo ifup wlan0
ioctl[SIOCSIWAP]: Operation not permitted
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
}}}
   * 觀看無線網路狀態：
{{{
# iwconfig
lo        no wireless extensions.

eth1      no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:"Your SSID Here"  Nickname:"<WIFI@REALTEK>"
          Mode:Managed  Frequency:2.442 GHz  Access Point: NN:NN:NN:NN:NN:NN   
          Bit Rate:54 Mb/s   Sensitivity:0/0  
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=100/100  Signal level=95/100  Noise level=0/100
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

eth0      no wireless extensions.
}}}
   * 

= Reference =
 * http://kerneldriver.wordpress.com/2012/10/21/configuring-wpa2-using-wpa_supplicant-on-the-raspberry-pi/