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22.16.5. 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 broadcast
command in the ntp.conf
file.
The broadcast and multicast modes require authentication by default. See Section 22.6, “Authentication Options for NTP”.
The
broadcast
command takes the following form:
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 RFC 2365 Administratively Scoped IP Multicast.