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Follow him on Telegram , Twitter , and YouTube. View all posts by Sergey Tkachenko. Thanks for these clear instructions. The part about editing the Windows 10 registry to add a server to the built-in list was especially useful to me. Just want to add that the registry key change worked not only on Windows 10 but also on Windows 7 and even Windows XP.
Your email address will not be published. Only the PDC needs to be configured to synchronize to an external time reference. When modifying registry settings, it is always a good idea to backup the current settings beforehand.
You can revert back to previous settings if any problems occur with registry changes. Change the server type to NTP. Set announce flags.
Specify the time sources. Alternatively, a list of IP addresses can be specified. Select poll interval. Microsoft recommends a value of , which equates to a polling frequency of once every 15 minutes. Almost every continent has a large number of clustered NTP time servers available. Including as of , Europe at , North America at , Asia at , Oceania at , making up a grand total of servers.
Again, for each of these zones, you can specify a 0, 1 or 2 prefix if multiple server names are required. For instance:. The domain names point to a random set of time servers in a particular zone that change every hour. Regular changes are required so that clients can be distributed evenly between the available NTP servers, to prevent overloading.
Google have recently revealed that they have implemented public NTP with load balancers and atomic clocks in their world-wide data centres. However, Google have adopted a slightly different non-standard approach to leap second insertion.
They have adopted leap-smearing technology to smoothly insert leap seconds over a period of time. Most Unix and Linux operating systems insert leap seconds by repeating the last second of the day.
This can cause problems with some software. Leap smearing involves slowing clocks for a period of time before and after the actual leap second.
This prevents leap seconds from being potentially disruptive events. However, leap smearing servers will provide a slightly different time to other servers during the insertion period. For this reason, Google recommends that its public NTP servers are not used in conjunction with other non leap-smearing servers. Open the Control Panel. If so, it will synchronize to the domain controller. In this instance, you will need to configure the domain controller to synchronize with an NTP server.
The ntpd daemon is configured from a configuration file ntp. Note: Remember that it is not recommended to configure smeared and non-smeared NTP servers. You should avoid excessive use of public NTP servers.
Only query servers at reasonable intervals. This may vary from once a day to a few times an hour, depending on your system requirements. NTP clients should never be configured to request time from a NTP server more frequently than once every four seconds. Clients that exceed this rate may be flagged as attempting a denial of service DoS attack and may be refused service.
It is generally accepted good practice to choose a relatively local time reference. Using local time references will reduce network latency and round-trip delays and provide a more robust time service.
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