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They're using wardriving. See www.wigle.net or skyhook.
On Jan 7, 2010, at 10:26 AM, "McGhee, Eddie" <Eddie.McGhee@ncr.com> wrote:
> I am sure most of you would have seen this yesterday at some point.
> I only have one question how does Google get the information of MAC
> address's and locations.
> I change my MAC quite a lot on my router when needing a new IP
> address if mitigating any attacks etc so does the ISP share this
> info with Google?
> Isn't that a breach of privacy laws if this is the case?
> If it is not the case then how does it pinpoint locations via MAC
> address? Bearing in mind ARP is a non routable protocol..
> p.s this worked for me and my friend around 1 mile away and the
> accuracy was perfect!! I would got to say it got my house and
> friends by 10 metres max! My other friend same ISP maybe 2-3 miles
> away shows nothing from his MAC.
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