root@bt:~# iwlist wlan0 scan
wlan0 No scan results
root@bt:~# iwlist wlan0 scan
wlan0 No scan results
root@bt:~# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:26:24:7E:76:A0
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=22/100 Signal level=22/100
Encryption key:on
ESSID:"UPC0040789"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=00000200109ad19b
Extra: Last beacon: 128ms ago
IE: Unknown: 000A55504330303430373839
IE: Unknown: 010882848B962430486C
IE: Unknown: 03010B
IE: Unknown: 050400010000
IE: Unknown: 2A0104
IE: Unknown: 2F0104
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 32040C121860
IE: Unknown: 2D1A7C181BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D160B001700000000000000000000000000000000000000
IE: Unknown: DD090010180205F0040000
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00