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ntpd periodically opens a dial-out connection. Can I avoid that?

April 26, 2017avoid connection dial-out ntpd opens periodically

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ntpd periodically opens a dial-out connection. Can I avoid that?

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Originally NTP has not been designed with dial-up connections in mind. Therefore it does not care very much about when to send out packets. If you have defined an external server or peer, ntpd will periodically poll it. The polling interval is limited by the settings minpoll and maxpoll (See Q: 5.1.2.4. and Q: 5.1.5.1.). The virtual stability of the system clock determines whether the polling interval is reduced or increased. However, increasing the polling interval may be a sub-optimal solution: ntpd will take longer for the initial synchronization, and it may become unable to catch up with the clock’s drift. For some operating systems you may be able to select what types of packets are allowed to open a dial-up connection.