[ntp:questions] Re: What exactly does prefer do?

Richard B. Gilbert rgilbert88 at comcast.net
Thu Apr 6 19:11:12 UTC 2006

Lee Sailer wrote:

> I have occasionally had a GPS NTS server goes slowly insane.  That is,
> it starts to differ from the others (we have 6 world wide) by 1, 2,
> then 3 second, and eventually hundreds of seconds.
> What bothers me about "prefer" is that if the preferred one goes
> insane, how long will clients that prefer it follow it?  How does
> "prefer" actually effect the choice and weighting function.
> Could people with actual internals/algorithm knowledge respond?  Also,
> if it matters, this is NTP 3.5f (HP-UX 11.11).

NTP 3.5f is history so ancient that few now living even remember it.

Start by downloading a copy of the reference implementation 
http://ntp.isc.org/bin/view/Main/SoftwareDownloads  and building it for 
your system(s).   If the current implementation still exhibits this 
behavior, file a bug report. 

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