ntptrace(1Mtcp)
ntptrace --
trace a chain of NTP hosts back to their master time source
Synopsis
ntptrace [ -vdn ] [ -r retries ]
[ -t timeout ] [ server ]
Description
ntptrace determines where a given Network Time
Protocol (NTP) server gets its time from by
following 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
server2.bozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
usnh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
On each line, the fields are (left to right):
-
the host name
-
the host's 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's ``synchronization distance''
(synchronization distance is a measure of the
accuracy of the clock's time).
-
the reference clock ID (only for stratum-1 servers)
All times are given in seconds. Synchronization distance is a
measure of the accuracy of the clock's time.
Options
- -d
-
turns on debugging output
- -n
-
turns off the printing of host names and gives Host IP addresses
instead. This may be necessary if a nameserver is down.
- -r retries
-
sets the number of retransmission attempts for each host; default = 5
- -t timeout
-
sets the retransmission timeout (in seconds); default = 2
- -v
-
prints information about the NTP servers
Exit codes
None.
References
xntpd(1Mtcp),
xntpdc(1Mtcp)
RFC 1035
Notices
This program makes no attempt to improve accuracy by doing multiple
samples.
30 January 1998
© 1998 The Santa Cruz Operation, Inc. All rights reserved.