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15.17.3. Adding a Peer Address

To add the address of a peer, that is to say, the address of a server running an NTP service of the same stratum, make use of the peer command in the ntp.conf file.
The peer command takes the following form:
peer address
where address is an IP unicast address or a DNS resolvable name. The address must only be that of a system known to be a member of the same stratum. Peers should have at least one time source that is different to each other. Peers are normally systems under the same administrative control.