[ntp:questions] ntpq and local clock driver

Unruh unruh-spam at physics.ubc.ca
Mon Mar 23 00:11:49 UTC 2009

emiddell at gmx.net (Eike Middell) writes:

>I've got a question regarding a ntp daemon that has only the
>"undisciplined clock driver" as a reference clock. To what 
>extent does this daemon influence the local clock?

Not at all. The local clock means that ntp does nothing. 

>The context of the question is the following.
>I've got a small network time synchronized to one host with a GPS clock.
>The status of the individual ntp daemons (especially the offset to their
>respective reference clock) are periodically monitored with ntpq.

>I would like to compare this setup to an independent time reference in
>order to see if there are collectively performed jumps. These I wouldn't
>see in the monitoring that I have so far. Since I want to detect
>suddenly occuring offsets, the independent reference would not have to
>be frequency stable. It only has to provide a continous time line.

Why are you suspecting jumps? 

>A cheap solution would be to add another host to the network which
>distributes its local time by ntp. So it would be possible to monitor
>this independent source with the already available tools. Of course
>nothing would be gained if the ntp daemon running on this host would
>create jumps in the provided time.

>Thanks in advance,
>Eike Middell

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