HP-UX Internet Services Administrator's Guide (February 2007)

of xntpd for this option. See “Configuring Authentication” (page 66) for more
information.
• version 1
You must specify this option if xntpd requests time from a host running ntpd, a
daemon that is based on version 1 of the NTP protocol. You must specify version
2 if xntpd requests time from a host running an xntpd implementation that is
based on version 2 of the NTP protocol. If you do not specify either of these options,
xntpd daemon sends version 3 NTP packets when polling the host. If the host
contains a version 1 or version 2 NTP protocol, the packets are discarded.
• prefer
This option specifies that the host must be the primary source for synchronization
when it is one of several valid sources. This option is useful for a time server on a
high-speed LAN that is equipped with an external time source, such as a radio
clock. You can use external sources for time synchronization. However, the local
time server must be the preferred synchronization source.
Apart from these options, you can define the broadcast client in the configuration file
using the broadcastclient yes | no statement. The statement broadcastclient
yes indicates that the local host must listen for and attempt to synchronize with the
broadcasted NTP packets. The optional statement broadcastdelay seconds specifies
the default round trip delay for a broadcaster.
NOTE: Every node in an NTP hierarchy must have either a server statement or a
broadcastclient yes statement in its configuration file. Every node must have an
upper-level server. A stratum-1 server must also have a server statement in its
configuration file, which specifies a radio clock or internal system clock as a time source.
If the local host assumes the role of a server in providing time to the clients, you need
not configure the local host as a time server on the local system. Instead, you must
specify the local host name or IP address in the server statement in the client system’s
configuration file.
If authentication is enabled on the local host, the roles you configure are subject to the
authentication process. For example, if you configure the local host as a peer or a client
of a stratum-1 server, and the remote server does not satisfy the standards for an
authenticated synchronization source, the local host does not use the remote server as
a time source. See “Configuring Authentication” (page 66) for more information.
Advanced NTP Topics 63