[ntp:questions] NTPv3 Select Dispersion

David L. Mills mills at udel.edu
Thu Jan 1 18:34:28 UTC 2009


Russel,

he detailed calculations are in the refeence implementation document on 
the NTP project page and in the NTPv4 Internet Draft. However, if the 
select dispersion is excessive, it isn't because the algorithm is in 
error; it's because you really do have large differences in the server 
population.

Dave

Russell, David wrote:

>I am trying to validate an NTP implementation that is exhibiting a lot
>of churn in the cluster algorithm.  Unfortunately I don't think that I
>been able to properly calculate the select dispersion based on RFC1305.
>
>
>Can anyone refer me to a more detailed description of the calculations
>or even better some example calculations with test data?
>
> 
>
>Regards,
>
> 
>
>David
>
> 
>
> 
>
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