实验室有wifi，上次以为是wep加密，结果弄了半天都invalid arguments，这次仔细看了下原来是WPA，参照ArchWiki搞定。
1. Check wpa_supplicant

# wpa_supplicant
...
drivers:
  wext = Linux wireless extensions (generic)
  nl80211 = Linux nl80211/cfg80211
  wired = wpa_supplicant wired Ethernet driver

2. Configure WPA with ssid(here mywireless) and key(here secretpassphrase)

# mv /etc/wpa_supplicant.conf /etc/wpa_supplicant.conf.original
# wpa_passphrase mywireless "secretpassphrase" > /etc/wpa_supplicant.conf
# vim /etc/wpa_supplicant.conf
network={
        ssid="mywireless"
        #psk="secretpassphrase"
        psk=****************************
}

Add this line to the conf file

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=wheel

3. Start WLAN

# ifconfig wlan0 up
# iwconfig wlan0 essid mywireless
# wpa_supplicant -B -Dwext -i wlan0 -c /etc/wpa_supplicant.conf
# dhcpcd wlan0

4. Check wlan0

# ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr 00:22:FA:5F:7F:66
          inet addr:192.168.1.122  Bcast:255.255.255.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:576  Metric:1
          RX packets:73529 errors:0 dropped:0 overruns:0 frame:0
          TX packets:59186 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:39228330 (37.4 Mb)  TX bytes:6663024 (6.3 Mb)

然后ping外面ping不通，发现是从eth0 ping出去的，执行/etc/rc.d/network stop把eth0上的网络关掉就可以了.

@————————————————我是泪的分割线—————————————@

在SteamedFish童鞋的教导下，我学习了netcfg的用法，深深地认识到了自己的错误。。。。

1. 创建netcfg profile

# cp /etc/network.d/examples/wireless-wpa /etc/network.d/
# vim /etc/network.d
CONNECTION='wireless'
DESCRIPTION='A simple WPA encrypted wireless connection'
INTERFACE='wlan0'
SECURITY='wpa'
ESSID='mywireless'
KEY='secretpassphrase'
IP='dhcp'
# move /etc/network.d/wireless-wpa /etc/network.d/[profilename]

2. Start network

# netcfg [profilename]