iwconfig
wlan0     IEEE 802.11b  ESSID:"linksys"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:13:10:87:B6:E1   
          Bit Rate=11 Mb/s   Tx-Power:20 dBm   Sensitivity=0/3  
          RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:100/100  Signal level:-61 dBm  Noise level:-256 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0


ifconfig

wlan0     Link encap:Ethernet  HWaddr 00:09:5B:64:6C:E0  
          inet6 addr: fe80::209:5bff:fe64:6ce0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:444 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:130040 (126.9 Kb)  TX bytes:468 (468.0 b)
          Interrupt:11 Memory:32000000-32000025 



 ifup wlan0
    wlan0     device: Realtek Semiconductor Co., Ltd. RTL8180L 802.11b MAC (rev 20)
              No configuration found for wlan0