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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 [command]#peer# command in the `ntp.conf` file.
 
The [command]#peer# command takes the following form:
 
[command]#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.
 
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 [command]#server# command in the `ntp.conf` file.
 
The [command]#server# command takes the following form:
 
[command]#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.
 
Adding a Broadcast or Multicast Server Address
 
To add a broadcast or multicast address for sending, that is to say, the address to broadcast or multicast `NTP` packets to, make use of the [command]#broadcast# command in the `ntp.conf` file.
 
The broadcast and multicast modes require authentication by default. See xref:Configuring_NTP_Using_ntpd.adoc#s1-Authentication_Options_for_NTP[Authentication Options for NTP].
 
The [command]#broadcast# command takes the following form:
 
[command]#broadcast# _address_
 
where _address_ is an `IP` broadcast or multicast address to which packets are sent.
 
This command configures a system to act as an `NTP` broadcast server. The address used must be a broadcast or a multicast address. Broadcast address implies the `IPv4` address `255.255.255.255`. By default, routers do not pass broadcast messages. The multicast address can be an `IPv4` Class D address, or an `IPv6` address. The IANA has assigned `IPv4` multicast address `224.0.1.1` and `IPv6` address `FF05::101` (site local) to `NTP`. Administratively scoped `IPv4` multicast addresses can also be used, as described in [citetitle]_link:++https://www.rfc-editor.org/info/rfc2365++[RFC 2365 Administratively Scoped IP Multicast]_.
 
Adding a Manycast Client Address
 
To add a manycast client address, that is to say, to configure a multicast address to be used for `NTP` server discovery, make use of the [command]#manycastclient# command in the `ntp.conf` file.
 
The [command]#manycastclient# command takes the following form:
 
[command]#manycastclient# _address_