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80 Chapter 6 NTP Service
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:
1 Make 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.
2 Open Server Admin, and select the server you want to act as a time server.
3 Click Settings.
4 Select the Advanced tab.
5 Select Enable NTP.
6 Click Save.
LL2351.Book Page 80 Monday, September 8, 2003 2:47 PM