ntptrace(ADMN)
ntptrace --
trace a chain of NTP servers back to the primary source
Syntax
ntptrace [-vdn] [-o version] [-r retries] [-t timeout] [server]
Description
ntptrace determines where a given Network Time Protocol (NTP) server gets
its time from, and follows the chain of NTP servers back to their master
time source. If given no arguments, it starts with localhost. Here is an
example of the output from ntptrace:
% ntptrace
localhost: stratum 4, offset 0.0019529, synch distance 0.144135
server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993,
refid 'WWVB'
On each line, the fields are from left to right:
-
the host name
-
the host stratum
-
the time offset between that host and the local host (as measured
by ntptrace; this is why it is not always zero for localhost)
-
the host synchronization distance
-
(only for stratum-1 servers) the reference
clock ID
All times are given in seconds. Note that the stratum is the
server hop count to the primary source, while the synchronization distance
is the estimated error relative to the primary source. These terms are
precisely defined in RFC 1305.
Options
-d-
Turn on some debugging output.
-n-
Turn off the printing of host names; instead, host IP
addresses are
given. This may be useful if a name server is down.
-o version-
Specify the NTP vesion for outgoing query packets as the
integer version, which can be 1, 2, or 3. The default
is 1 to allow ntptrace to communicate with older
implementations of NTP.
-r retries-
Set the number of retransmission attempts for each host (default = 5).
-t timeout-
Set the retransmission timeout in seconds (default = 2).
-v-
Print verbose information about the NTP servers.
Limitations
This program makes no attempt to improve accuracy by doing multiple samples.
See also
ntpd(ADMN),
ntpdc(ADMN)
RFC 1305
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003