Symmetricom Time Server - Manual (Page 110)

A-96 TimeVault™ User’s Manual 6000-100AppA.fm Rev. C
Appendix A: NTP Version 3, NTPQ, and NTPDC Cross Check Functionality with NTPQ and NTPDC
A.3 Cross Check Functionality with NTPQ and NTPDC
Note: A number of NTP-related programs, such as NTPDC and NTPQ, are not
supported, in the conventional sense, by Dr. Mills’ NTP, and therefore cannot be
supported by Symmetricom, Inc. (TrueTime, Inc. is now Symmetricom, Inc.) The user of
these programs does so at his or her own risk.
NTPQ and NTPDC are query programs used to obtain TimeVault’s offset, relative to any
server for which the unit is configured (page 3-36 or page 4-69 show where this list is
located in the "ntp.conf" file), as well as information about any of the unit’s
synchronization sources, such as ACTS. A separate SNMP alarm (trapMsg7, see )
notifies you when the TimeVault offset is greater than 1 second relative to the first NTP
server in the ntp.conf file list, and the server is not otherwise in an alarm condition.
A.3.1 NTPQ
NTPQ is a query program that uses the standard protocol defined in RFC-1305 to
diagnose and repair problems that affect the operation of NTP. NTPQ uses NTP mode 6
(control mode) packets to query NTP servers (and any compatible servers on the network
that permit it) about current state, as well as to request changes in that state. NTPQ can
also obtain and print a list of peers in a common format by sending multiple queries to the
server.
A.3.2 NTPDC
NTPDC is a special query program that uses NTP mode 7 (private mode) packets to
provide extensive state and statistics information and can be used to set configuration
options at run time.
The NTP daemon sends information about the current calculated offset between its time
and the time of each of its NTP peers. The NTPDC command formats the information on
the standard output.
A.3.3 For more information
NTPQ and NTPDC are fully documented at the following Internet sites:
• NTPQ: http://www.eecis.udel.edu/~ntp/ntp_spool/html/ntpq.htm
and
• http://www.doc.ic.ac.uk/~mac/manuals/hpux-manual-pages/hpux/usr/local/man/man8/ntpq.8.html
If you enable TimeVault’s Remote Lock feature, you disable all settable features of NTPQ and
NTPDC.
TimeVault uses NTP v. 4.0. Do not mix NTP v. 3.0 and NTP v. 4.0 utilities and daemons. For
example, the NTPDC program cannot be used to monitor the XNTP daemon. To monitor the
XNTP daemon, use either NTPQ or XNTPDC. However, do not use XNTPDC to monitor NTP
use NTPDC instead.