[ntp:questions] synchronization distance

David L. Mills mills at udel.edu
Sat Dec 4 00:42:37 UTC 2010


I had no idea somebody would try to configure current NTPv4 with a poll 
interval of a week. The current maximum allowed is 36 h. Windows ex box 
at one time did use symmetric active mode in error, but I understand it 
now uses client mode as specified. In any case, Windows NTP (not NTPv4 
running in Windows) is cheerfully ignorant of most NTP parameters, 
including synchronization distance, and that is peachy keen as long as 
the users are satisfied.


David Woolley wrote:

> David L. Mills wrote:
>> I'm confused about your explanation, especially the "default 
>> configuration". The definitive explanation of synchronization distance, 
> "default configuration" was talking about w32time.  w32time can end up 
> polling about once a week, and therefore reporting a root dispersion 
> that is well over a second.  I think, if it has ever been 
> synchronised, it will continue to report an increasing root dispersion 
> and stratum 2, even if it never gets any more updates.
> Other aspects of the default configuration include the symmetric 
> active feature and a stratum that is 2, regardless of the source stratum.
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