Using NTP on Your Network

Mac OS X Server can act not only as an NTP client, receiving authoritative time from an Internet time server, but also as an authoritative time server for a network. Your local clients can query your server to set their clocks. It’s advised that if you set your server to answer time queries, you should also set it to query an authoritative server on the Internet.

Setting Up NTP Service

If you choose to run NTP service on your network, make sure your designated server can access a higher-authority time server. Apple provides a Stratum 2 time server for customer use at time.apple.com.

Additionally, you’ll need to make sure your firewall allows NTP queries out to an authoritative time server on UDP port 123, and incoming queries from local clients on the same port. See Chapter 3, “IP Firewall Service,” on page 43 for more information on configuring your firewall.

To set up NTP service:

1Make sure your server is configured to “Set Date & Time automatically.”

This setting is in the Date & Time pane of System Preferences, or the Server Admin Settings pane for the server.

2Open Server Admin, and select the server you want to act as a time server.

3Click Settings.

4Select the Advanced tab.

5Select Enable NTP.

6Click Save.

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Chapter 6 NTP Service

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Apple 034-2351_Cvr manual Using NTP on Your Network, Setting Up NTP Service, To set up NTP service

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