There are a large number of public NTP time servers available across the Internet. Here we aim to provide an insight into available network time servers, configuring your client and synchronization best practices.
The NTP pool project has been around for some time. The project provides Internet access to very large virtual clusters of NTP servers. The time servers that make up the pools are volunteered and made public by individuals or enterprises that have servers on the internet. Pools of servers are located in most countries around the world.
This allows clients to utilize a server that is relatively close, reducing round-trip delays and improving integrity. The project is a subscription free service that is used world-wide by thousands of clients. Many computer systems and network devices are configured by default to synchronize to their time servers.
Thank you very much Friday, December 23, AM. You can also use the prefix 0, 1 or 2 to specify different pools of servers, if multiple server names are required:. 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. NTP will check the various servers against each other. It doesn't simply switch when there is an outage. The computers in your domain should sync only with the DCs, the DC should sync to several external servers. Add a comment. Active Oldest Votes. Improve this answer. Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Though it may appear as Windows will only let you configure one internet time-server, it does support synchronizing with multiple time-servers for increased accuracy and reliability.
Here is how you set it up. By default, Windows will only connect to a single time-server operated by Microsoft. Although, your network router may auto-configure other network servers on your behalf.
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