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     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


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