lo        no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:"R\xC3\xA9seau de Arnaud GUITARD"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 90:84:0D:DC:BB:AB   
          Bit Rate=1 Mb/s   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=15/100  Signal level=15/100  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0