Installing and Administering Internet Services

Chapter 7 233

Conﬁguring NTP

Troubleshooting ntp

For external clocks, xntpd will 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 (HP-UX 10.0 NTP is version 3) are ignored by

NTP version 1 and version 2 systems. The solution is to indicate the

version 1 and 2 systems in the conﬁguration entries on the version 3

systems. This will tell the version 3 system to use the older message

formats when communicating with these systems.

The following conﬁguration ﬁle entries tell 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 when reporting NTP problems:

• /etc/ntp.conf (or an alternate conﬁguration ﬁle, if used)

• /etc/rc.config.d

• NTP driftﬁle (if conﬁgured)

• NTP statistics ﬁle (if conﬁgured)

• /var/adm/syslog/syslog.log (xntpd/NTP entries)

• output from /usr/sbin/ntpq -p

• output from ntpdate -d server (stop the local xntpd ﬁrst)