[ntp:questions] "good enough" ntp configuration

Richard B. Gilbert rgilbert88 at comcast.net
Sat Jun 9 18:49:03 UTC 2007

Steve Kostecke wrote:
> On 2007-06-08, Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>Mark Boolootian wrote:
>>>I'm a simple-minded dweeb looking to provide campus systems with
>>>reasonably accurate clocks.  If campus system clocks are within, say,
>>>two seconds of one another, they'll probably let me keep my job.
>>>I've rummaged through the docs and mailing list, but I haven't really
>>>found an answer to this "good enough" kind of question.  At the moment,
>>>I have a pair of NTP stratum 1 appliances, one GPS, the other CDMA.  
> <snip>
>>>What I'd like to know is, given my desire for sub-two seconds of     
>>>accuracy (am i using the correct term for what i want?) am I good    
>>>enough to just point clients at the stratum 1 pair?                  
>>You're probably okay just pointing the whole campus to your two
> In which case you must ensure that these two servers stay in relatively
> close synchronization.
> With only two servers of equal strata the clients will not have a
> clear best choice. If the servers drift too far apart you could have
> cases of inter-client offsets exceeding your stated accuracy.

I'd say that given the devices he is using, the probability of them 
"drifting apart" is vanishingly small.

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