HP-UX Internet Services Administrator's Guide (August 2003)
Configuring NTP
Advanced NTP Topics
Chapter 4 79
• “Configuring Authentication” on page 83
Configuring Relationships with Other Time Servers
The role of a time server depends on its relationship with other servers
in the synchronization subnet. In the configuration file, you can define a
role using one of the following statements for peer, server, broadcast
and broadcastclient:
• peer host|IP_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” on page 81
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:
• key
number
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” on page 83 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.