Re:Passive TCP/IP Geo-Location
by contingencies on Monday June 27, 2016 @08:25AM
(#11985693)
If ping times are over 250ms the user's likely location is China (but could also be online via satellite, or in space). Of course, if the user is in China, Google Maps won't display.
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Eh? RTT between London and Sydney for example is around 300ms and testing that page, I see a 316ms RTT from Singapore (in London).
Theoretical minimum RTT's based on the speed of light for systems on the opposite side of the world is nice and all but doesn't take into account the realities of packet processing on the internet.
Re:Passive TCP/IP Geo-Location
by contingencies on Monday June 27, 2016 @09:09AM
(#11985896)
Yes but speaking statistically, since virtually nobody lives in Australia or London versus China, the user's likely location is China.
..and those of actual cable routing (esp. on land), and the speed of light in fiber vs. vacuum, that alone adding 66ms for a great circle.
Re:Passive TCP/IP Geo-Location
by jschwartzi on Monday June 27, 2016 @10:32AM
(#11986351)
Or they're on Comcast with wifi in a large apartment building. I have a 250mS ping, and I'm definitely not in China.