Can you guide me to the best Wi-Fi sniffer software?
Thanks in advance
"Best" might depend on your budget.
AirMagnet is some pretty slick software, but is ~US$5000.00.
AiroPeek is also very nice, and is a little less.
WireShark with the wireless WinPCAP software is generally sufficient for most needs, and it's free (within the GPL limits, I believe).
Personally, since I had to buy my own, I use CommView for wireless. It's good software, can decrypt WEP and WPA (you provide the key), and has a few handy bells & whistles. Cost is ~US$600.00
I think there's a personal version of Air Magnet as well (free / cheap for personal use). I haven't tried it.