HP-UX Internet Services Administrator's Guide (May 2010)
• peer hostIP_address specifies that host must provide time to the local host with
which the local host can synchronize its time, and the local host must also provide
time to the host.
• server host IP_address specifies that host must provide time that the local
host can synchronize to, and the local host does not provide time to which the host
can synchronize to. (The local host is a client for the host.) Additionally, you can
define server statements to configure external clocks (radio clocks or local system
clocks) for stratum-1 servers. See “Configuring an External Clock” (page 62) for
more information.
• broadcast host broadcast_address specifies that the xntpd daemon in
the local host transmits broadcast NTP messages to the broadcast_address, usually
the broadcast address on the local network (The local host is a broadcaster.)
You can specify one or more of the following options using the peer, server, or
broadcast statements:
• keynumber
This option specifies that the NTP packets sent to the host are encrypted using the
key that is associated with number. You must enable the authentication feature
of xntpd for this option. See “Configuring Authentication” (page 64) 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 yesno 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.
Advanced NTP Topics 61