On Wed, Feb 16, 2011 at 09:22, Masataka Ohta <
mohta(_at_)necom830(_dot_)hpcl(_dot_)titech(_dot_)ac(_dot_)jp> wrote:
Richard L. Barnes wrote:
As an example, consider a system we built for the IETF meeting
network a few years ago. The server queried a series of
tables inside of NetDisco to map an IP address to the WiFi AP
that it was connected to:
IP address --> MAC address --> Connected AP
As the MAC addresses are NOT reliable, it is a lot more straight
forward to directly map between IP addresses and APs.
In the (excellent!) experiment, you associated yourself with one or more MAC
addresses. Your IP address is more likely to change than your MAC.
Since the locations of the APs are known, this gives you the
location of the endpoint to within a few tens of meters
(empirically, within the IETF network).
Directional antenna makes it imprecise.
In the (truly excellent) experiment, the goal was to find out which room
someone was in so you could find them.
swb
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