The main NTP daemon, xntpd, reads its configuration file, /etc/inet/ntp.conf, when it starts up. The contents of the configuration file determine whether the system is a client or a server and also the address of the time server. This section describes the configuration options, as well as how to configure an NTP server and an NTP client.
NTP can be configured in a number of ways:
The local system can be used as the reference time source.
Another server on the local network can be used as the reference time source. This is preferred if you need to have all systems on the local network synchronized—it might not be to the correct time, but all the systems can be synchronized at the same time.
A server on the Internet can be used ...