lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     802.11b/g .....  ESSID:"DLR-SfR Gastzugang"  
          Mode:Managed  Frequency=2.472 GHz  Access Point: 00:14:1B:B4:ED:30   
          Bit Rate=54 Mb/s   
          Retry:on   RTS thr:off   Fragment thr:off
          Encryption key: <hidden>
          Power Management:off
          Link Quality=0/100  Signal level=0 dBm  Noise level=0 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0