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NTP: When do Clients request sync?

Posted on 2013-06-12
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Last Modified: 2013-06-13
In a Linux or Unix environment how often does a client configured to use NTP request synchronization information from the NTP server? Is there some file I can look at that shows the frequency of how often NTP synchronization occurs? How does this work?
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Question by:TGarey123
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mccarl earned 500 total points
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Check the man page for ntpd for details on its operation, including the poll interval. But basically, it varies between a minimum and a maximum value, depending on how well the internal clock has previously stayed in synch, ie. if the clock is in synch the poll interval gradually increases, but then if it ever starts getting more and more out of synch on each poll, the interval will be shortened again.

As for log files, the ntpd writed log information to either a logfile or the system log service, depending on how it has been configured on your system. It has been a while so I can remember too well what exactly it writes in there, but it would probably be the first place I would look to see if you can find out when it has polled any time servers.
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