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22.16.4. Adding a Server Address

To add the address of a server, that is to say, the address of a server running an NTP service of a higher stratum, make use of the server command in the ntp.conf file.
The server command takes the following form:
server address
where address is an IP unicast address or a DNS resolvable name. The address of a remote reference server or local reference clock from which packets are to be received.