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This happens for every request that is between 515 and 517 bytes long (on the wire), no matter what protocol. Wireshark shows lots of "TCP retransmission" for HTTP requests of this size.
I search my gateway with route, and after I ping it with no problem ping 192.168.1.1 -s 473. I repeat with 472,476,515,517.. all ok. I repeat with a fixed IP on internet. No problem again. Which is your system, which the version of ping?
Write it as an answer, add the model of the USB stick the version of your system and of your ping command. It should help somebody else, and welcome on superuser.
route
, and after I ping it with no problemping 192.168.1.1 -s 473
. I repeat with 472,476,515,517.. all ok. I repeat with a fixedIP
on internet. No problem again. Which is your system, which the version of ping?