lo        no wireless extensions.

eth0      no wireless extensions.

ppp0      no wireless extensions.

wlan0     802.11b/g  link  ESSID:"ChinaNet-Qn3X"  
          Mode:Managed  Frequency=2.417 GHz  Access Point: 00:25:12:19:EA:1F   
          Bit Rate=54 Mb/s   
          Retry:on   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=66/100  Signal level=-49 dBm  Noise level=-97 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0