root@bt:~# iwconfig
lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any
          Mode:Managed  Access Point: Not-Associated   Tx-Power=off
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:on

eth0      no wireless extensions.


root@bt:~# ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr 11:11:11:11:11:11
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@bt:~# ifconfig wlan0 up
SIOCSIFFLAGS: Unknown error 132
root@bt:~#