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I believe the author's point was you could determine the location by monitoring other applications and their network calls. That being said, I highly doubt the

I believe the author's point was you could determine the location by monitoring other applications and their network calls. That being said, I highly doubt there are many requests being made to Bangalore, India and this appears to require requests to a wide array of locations all over the world.

SomewhatLikely 10y ago
On the contrary, it appears the most accurate servers are ones nearby, which you'd contact a lot if CDNs are doing their job right.
lucb1e 10y ago
Aside from the disproportional amount of traffic going to America (I'm from Europe), there was still a significant portion of traffic that went all over the world when I last checked for my private traffic. Additionally I once made a map of destinations from our school's "security lab" network. This is 30 minutes of traffic: https://snag.gy/aJqrg2.jpg https://snag.gy/aJqrg2.jpg The map is a modified version of the one generated by Wireshark (circles are proportional to the amount of data going from/to that IP address). It seems to use Maxmind's GeoIP database.
Arnt 10y ago
It requires precisely what services such as Cedexis provide. You visit a website that uses one or more CDNs for its big resources, and uses Cedexis to choose CDN node. When you first visit, Cedexis instructs your browser to retrieve small resources from some/all CDN nodes. Based on timings and throughput, it then chooses a CDN node to use for big resources. If Cedexis does its job well and obtains the right data for Cedexis' purposes, then the passive observer also gets optimally usable data.