Far away clients from AWS

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It is normal to receive NTP requests from Amazon servers located in different countries around the world.
I also get requests from Europe, Asia and Australia, even though my NTP server is located in the US. I mentioned this fact here:

Lots of requests from *.bc.googleusercontent.com to my pool server

I checked a recent packet capture and located only 93 requests from the ASN “Google”. A derisory value compared to asn requests “AMAZON-02”, which in the same 20-second period counted 15442 packets (6.4% of all ntp traffic received). A curious fact, is that although my server is present in pool USA, it receives a huge amount of requests from Amazon servers in other countries like UK, Ireland, France… This indicates that many Amazon servers are configured to use the US pool instead of your own …