mailing list archives
Re: Wireless range limiting
From: RB <aoz.syn () gmail com>
Date: Wed, 16 Apr 2008 10:40:19 -0600
where you want the wireless signal to reach and it would reject
clients outside this range based on the signal.
Unless your radio environment were perfectly symmetric (same client
radios, same client construction, held in same orientation), it would
be difficult to do reliably. Even then, all it would take is a
high-gain antenna and an overpowered radio, and who's to say that
client at -79dBm really isn't on-campus?
Signal strength can be used to perform rough triangulation, which I've
seen some products use to do AP exclusion and very rough client
tracking, but definitely not signal strength alone. Even that can be
defeated with a narrow-beam (3-5 degree) antenna. The 802.11
'security' arena is chock-full of snake oil, especially since there
aren't many competent clients with good radio security people.