General NTP questions

Carl Johnson carlj at
Sun Aug 14 15:46:17 UTC 2016

Quartz <quartz at> writes:

> In general, do FreeBSD and related OSs (Dragonfly, OSX, etc) have ways
> of restricting the ntp drift to always be within certain known-sane
> parameters, and/or ways of manually adjusting the drift on the fly
> without having to stop and restart ntpd?

I think the -f option to ntptime(8) will adjust it as you want, but I
don't know how to limit it.  I think the only limits are that it has to
be within ±500ppm.
Carl Johnson		carlj at

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