из ФАКа к wireshark ( 
http://www.wireshark.org ):
   Q 8.9: I'm trying to capture 802.11 traffic on Windows; why am I not seeing
   any packets?
   A: At least some 802.11 card drivers on Windows appear not to see any
   packets if they're running in promiscuous mode. Try turning promiscuous mode
   off; you'll only be able to see packets sent by and received by your
   machine, not third-party traffic, and it'll look like Ethernet traffic and
   won't include any management or control frames, but that's a limitation of
   the card drivers.
   See MicroLogix's list of cards supported with WinPcap for information on
   support of various adapters and drivers with WinPcap.
   Q 8.10: I'm trying to capture 802.11 traffic on Windows; why am I seeing
   packets received by the machine on which I'm capturing traffic, but not
   packets sent by that machine?
   A: This appears to be another problem with promiscuous mode; try turning it
   off.