[ntp:questions] ntpd questions - FreeBSD 5.5

Danny Mayer mayer at ntp.org
Mon Jul 20 19:13:42 UTC 2009

Todd Glassey wrote:
> Danny Mayer wrote:
>> Run ntpd continuously and see if that solves your problem.
> Which opens a huge security problem - you should ONLY run NTPd on
> systems which are serving time to other systems. Otherwise a simple CRON
> process to every minute test the existing setting of the time from a
> reliable set of reference systems totally answers this problem.

That's nonsense. You will have potentially big swings and even backwards
steps with that poorly thought-out strategy. ntpd used continuously on
tne client disciplines the clock and smooths out the clock and keeps the
frequency such that it will keep good time. Testing existing time
provides you with nothing except more logs which will be ignored at
best. Disciplining the clock is what you need to be doing.


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