[ntp:questions] Number of servers needed to detect one falseticker?

David Woolley david at ex.djwhome.demon.invalid
Tue Jan 4 23:16:20 UTC 2011


Miroslav Lichvar wrote:
> On Tue, Jan 04, 2011 at 02:35:13PM -0500, Richard B. Gilbert wrote:
>> The problem with using only two servers is that NTPD has no means of
>> determining which is more nearly correct when the two differ, as
>> they inevitably will!
> 
> ntpd will pick the one with smaller distance if their intervals
> overlap. Otherwise they both will be falsetickers.
> 
In this case, ntpd will use an average of both of them, when the 
confidence intervals overlap; it will not pick just one except for the 
purposes of providing downstream error statistics.




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