I think there's a bug in the circle placement. They don't appear to be correct for me. I'm assuming they're supposed to be centred on the locations listed.
[deleted]
Passive TCP/IP Geo-Location
21–30 of 91 posts
Re: Passive TCP/IP Geo-Location
#22Earlier quoted context omitted.
I assume each circle has a radius proportional to the rtt, thus the area in which the circles overlap is roughly where you should be. The limited amount of servers + wide range of rtt gives a massive margin of errors, but this is probably easily improvable through some extra servers and some kind of knn-ish analysis.
Well in my case somehow javascript places Singapore circles center to middle of Indian ocean close to Antarctica. San Francisco and Bangalore are in South America.
That's not an inclusive circle, it means anything within the circle is _not_ reachable within the RTT reach of ie. Bangalore or Singapore.
Re: Passive TCP/IP Geo-Location
#23I think there's a bug in the circle placement. They don't appear to be correct for me. I'm assuming they're supposed to be centred on the locations listed.
I though that too at first, but they are correct. It looks like this because these are circles on a globe. The outline of a very big circle around a location is the same as the outline of a small circle around the point on the opposite side of the globe. Look at the color-tint to find out what is inside and what is outside a circle.
Ah yes, I see. My ping times to Singapore are so bad that it looks like a circle over Columbia/Ecuador, ie the other side of the globe, but what looks like a circle is actually what's outside the circle.
Re: Passive TCP/IP Geo-Location
#24Seems a bit off for me in Virginia, USA.
Re: Passive TCP/IP Geo-Location
#25Re: Passive TCP/IP Geo-Location
#26Seems a bit off for me in Virginia, USA. http://imgur.com/TblQSSu
Looks about right, the circle around Columbia is not shaded inside - that is, the center of the circle is on the other side of globe. So Virginia lies in the most heavily shaded region.
Re: Passive TCP/IP Geo-Location
#27Only works if JavaScript is allowed by default.
Re: Passive TCP/IP Geo-Location
#28my result: https://snag.gy/4X5ZyN.jpg
Re: Passive TCP/IP Geo-Location
#29Works for me! Correctly identified my location as Germany.
Re: Passive TCP/IP Geo-Location
#30I did this a few years ago, a simple tool that pinged places all over the world and calculated where you should be.
This only ever gets as close as your ISP, or perhaps a local routing center if your ISP has multiple (mine has only one in Amsterdam, I live on the other side of the country). This means it's less accurate than your typical GeoIP database.
Edit: I'm no longer sure this is the same. The title mentions "passive", and from another comment I understand that the author meant that you can find someone's location if you are the man in the middle, observing traffic to various places around the world. This is definitely something I had not considered yet!