[ntp:questions] NTP 128ms

MORRIS, Joe J Joe.MORRIS at nats.co.uk
Thu Oct 6 12:49:42 UTC 2016

Probably a simple answer, but I don't seem to be able to find it. I understand that any difference between the time source and expected time on the client below 128ms will result in the local time being changed to reflect the new time. What safeguards are there in place to stop the time source (either through fault or malicious attack) changing the time by say 100ms every time its polled? Assuming a poll every minute, over 10 minutes, the time could be changed by a second.

Many thanks

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