RE: Wireless LAN question

From: Beverstock, David (dbeverst@nsf.gov)
Date: 07/01/02 

From: "Beverstock, David" <dbeverst@nsf.gov>
To: 'David Laganière' <spanska@securinet.qc.ca>, security-basics@securityfocus.com
Date: Mon, 1 Jul 2002 09:59:49 -0400

David,

GPS is a passive device, it only listens for timing signals from satellites,
it doesn't transmit. You are left with the wireless NIC, which does
transmit.

I know work has been done to roughly triangulate a cell phone users position
based on signal strength received at 3-4 cell towers (I believe to fulfill
upcoming 911 legislation). It seems to me you would need 3-4 access points,
but could do the same thing with 802.11. But somehow I don't think this
model translates well to the real world.

I know with the Lucent/Agere Orinoco windows drivers there is a very nice
signal strength indicator in the client manager (along with MAC addresses).
You could get a directional 2.4 GHz antenna
(http://www.andrew.com/catalog38/Results.aspx?SearchType=1&KeyWord=&KeyWordS
earchMethod=BEGINWITH&CatalogSectionID=17), and just turn it slowly and
watch the signal increase and decrease (similar to what wildlife biologists
do to track large mammals), and roughly locate the user that way.

http://nocat.net/ might also be a solution for you to look at.

Cheers,

Dave

-----Original Message-----
From: David Laganière [mailto:spanska@securinet.qc.ca]
Sent: Friday, June 28, 2002 10:05 AM
To: security-basics@securityfocus.com
Subject: Wireless LAN question

Hi!

Say an intruder connect himself to my wireless LAN, is there a way with
a GPS and it's signal to know where he is physically? Where can I get
more documentation on that?

Thanks. 

--
David Laganière
Network/System Administrator
www: http://www.securinet.qc.ca/
email: spanska@securinet.qc.ca

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