On Wed, Feb 16, 2011 at 09:22, Masataka Ohta < [email protected]> 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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