NTP time source settings and behaviour

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stan drews

Hi. Hope someone is able to assist?

Our domain has connectivity to 2 x NTP hardware clocks. I have my DC with PDCe FSMO role configured with the IP addresses of these two hardware clocks with a view to providing redundancy in the event of a single clock failure.

EG; I have the IPs of both hardware clocks specified in the NTP Server field in the 'Configure Windows NTP Client' GPO setting.

Whats confusing me is when running a w32tm /query /status on the DC, both hardware clocks show up as 'Active' where I would expect 1 to show as active and the other maybe inactive or are they queried in a round-robin manner?

My questions are:

  1. Do I need to prefix the IP's of the hardware clocks with '0' and '1' ( I have noticed this config in some articles when using internet time addresses) to stipulate primary/secondary?
  2. How does Windows handle failure of or lack of connectivity to the primary clock? Does it automatically start using the secondary in the event of the primary being unavailable, and would this be on the next query?

Thanks in advance for any help.

Mat

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