HP-UX Internet Services Administrator's Guide (May 2010)

first reception writes a value of 16000 seconds to the disp value for the broadcastclient
entry. Because the client or peer polls the timeserver in case of a server entry, the original
disp value is set to disp.
For HP-UX NFS Diskless Clusters, the /sbin/init.d/xntpd script on the diskless
clients executes xntpdate to synchronize time with the diskless cluster server before
starting xntpd.
You can also specify a trusted time server explicitly in the file
/etc/rc.config.d/netdaemons, and /sbin/init.d/xntpd will execute
xntpdate, querying the specified time server.
Startup Delay
When xntpd is started, it takes five poll cycles (320 seconds using the default polling
interval) to form an association with a higher-level server or peer. During this time
window, xntpd does not respond to time requests from other NTP systems, because
it does not have a suitable time source. This window exists even though xntpd is using
an external clock, which can be either an attached radio clock (Netclock/2 WWVB
Synchronized Clock) or the local system clock (server 127.127.n.n).
For external clocks, xntpd does not form a complete association until it has sent five
successful polls to itself using the local loopback address.
Problem 2: Version 1 and 2 NTP Servers Do Not Respond
NTP version 3 packets are ignored by NTP version 1 and version 2 systems. The solution
is to indicate the version 1 and 2 system in the configuration entry on the version 3
system. This informs the version 3 system to use the older message formats when
communicating with these systems.
The following configuration file entries inform xntpd to use NTP version 2 message
formats when communicating with some_ver2.sys and NTP version 1 when
communicating with some_ver1.sys.
server some_ver2.sys version 2
server some_ver1.sys version 1
Reporting Problems
Provide the following information while reporting NTP problems:
• The configuration file /etc/ntp.conf (or an alternate configuration file)
• The /etc/rc.config.d file
• NTP driftfile (if configured)
• NTP statistics file (if configured)
• The /var/adm/syslog/syslog.log file (xntpd/NTP entries)
• The /usr/sbin/ntpq -p output
• The ntpdate -d server output (stop the local xntpd first).
74 Configuring NTP