Miroslav Lichvar 59d1b41716 ntp: restrict use of sub-second polling intervals ...

When the local polling interval is adjusted between minpoll and maxpoll
to a sub-second value, check if the source is reachable and the minimum
measured delay is 10 milliseconds or less. If it's not, ignore the
maxpoll value and set the interval to 1 second.

This should prevent clients (mis)configured with an extremely short
minpoll/maxpoll from flooding servers on the Internet.

2018-06-22 12:11:36 +02:00

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