Show Table of Contents
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
NTPpackets to, make use of the
broadcastcommand in the
The broadcast and multicast modes require authentication by default. See Section 22.6, “Authentication Options for NTP”.
broadcastcommand takes the following form:
where address is an
IPbroadcast or multicast address to which packets are sent.
This command configures a system to act as an
NTPbroadcast server. The address used must be a broadcast or a multicast address. Broadcast address implies the
255.255.255.255. By default, routers do not pass broadcast messages. The multicast address can be an
IPv4Class D address, or an
IPv6address. The IANA has assigned
FF05::101(site local) to
NTP. Administratively scoped
IPv4multicast addresses can also be used, as described in RFC 2365 Administratively Scoped IP Multicast.