I would broaden your experiment to try many different remote servers.
Maybe using different chunks of the global NTP pool
(https://www.ntppool.org/en/use.html)
It could be traffic shaping on your ISP , an ISP in the middle, or one
on the remote end.
It could be traffic prioritization
Steve:
Many thanks for that link to your paper on NTP
http://leapsecond.com/ntp/NTP_Paper_Sommars_PTTI2017.pdf
I read the entire paper, not just figs 7 and 8, and it explains everything.
I was beginning to doubt my own sanity because several authorities that I
had consulted told me quite
See figures 7 & 8 in
http://leapsecond.com/ntp/NTP_Paper_Sommars_PTTI2017.pdf
When a router forwards an NTP packet multiple potential egress links may
have equal cost. In order to distribute the traffic across the egress
links the router can use the IP addresses and UDP source/destination port
Greetings, Time Nuts, from a new member.
I have two old Windows XP laptops on which I can lock the timing to GPS,
which means I can read the time at which things happen to a few
microseconds. I thought I would modify some of my old NTP software, both
client and server, to make use of this
