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

and 1024 seconds (approximately 8 mins. and 17 mins.). Systems with external
clocks, like GPS, must poll every 64 seconds or less.
• The reach (reachability) column indicates how successful attempts to reach the
server are. This is an 8-bit shift register with the most recent probe in the 2^0
position. The value 001 indicates the most recent probe was answered, while 357
indicates one probe was not answered. The value 377 indicates that all the recent
probes have been answered.
• The delay (round trip time) column indicates the time (in milliseconds) taken by
the reply packet to return in response, to a query sent by the server.
• The offset (time difference) column indicates the time difference (in milliseconds)
between the server’s clock and the client’s clock. When this number exceeds 128,
and the message synchronization lost appears in the log file.
• The disp (dispersion) column indicates the difference in the offset measurement
between two samples. This is an error-bound estimate. The dispersion is a primary
measure of the network service quality.
Troubleshooting NTP
This section outlines techniques that can help you diagnose and correct common
problems with the NTP.
Verifying That xntpd is Running
Issue the following command to determine out if xntpd is running:
/usr/bin/ps -ef | /usr/bin/grep xntpd
This command reports the process identification (PID), current time, and the command
invoked (xntpd). Following is an example output:
daemon 4484 1 0 Feb 18 ? 0:00 xntpd
Ensure that syslogd is configured to log daemon information messages to the file
/var/adm/syslog/syslog.log. To check this configuration, ensure that the file
/etc/syslog.conf includes one of the following entries:
*.info /var/adm/syslog/syslog.log
or
daemon.info /var/adm/syslog/syslog.log
If xntpd is not running, check the syslog file for related messages.
72 Configuring NTP