Driver for device rausb0 has been compiled with version 22

在使用iwconfig命令的时候提示的一个警告：

# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

Warning: Driver for device rausb0 has been compiled with version 22
of Wireless Extension, while this program supports up to version 20.
Some things may be broken...

rausb0    RT73 WLAN  ESSID:"A12_411"  Nickname:""
          Mode:Managed  Frequency=2.412 GHz  Access Point: 5C:63:BF:8F:EF:70   
          Bit Rate=54 Mb/s   
          RTS thr:off   Fragment thr:off
          Encryption key:off
          Link Quality=89/100  Signal level:-32 dBm  Noise level:-79 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

        这是由于iwconfig的版本不够高引起的，于是我到网上下载了最新的版本（http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html），再重新编译下载到板子上之后就可以了。

安装了新的之后：

# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

rausb0    RT73 WLAN  ESSID:"A12_411"  Nickname:""
          Mode:Managed  Frequency=2.412 GHz  Access Point: 5C:63:BF:8F:EF:70   
          Bit Rate=54 Mb/s   
          RTS thr:off   Fragment thr:off
          Encryption key:off
          Link Quality=87/100  Signal level:-34 dBm  Noise level:-79 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0