ntptrace(1) -- Linux man page
NAME
ntptrace - trace a chain of NTP servers back to the primary
source
SYNOPSIS
ntptrace [ -vdn ] [ -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
On each line, the fields are (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,
and (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
-
Turns on some debugging output.
- -n
-
Turns off the printing of host names; instead, host IP
addresses are given. This may be useful 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 verbose information about the NTP servers.
BUGS
This program makes no attempt to improve accuracy by doing multiple
samples.
SEE ALSO
Primary source of documentation: /usr/share/doc/ntp-*/ntptrace.php
AUTHOR
David L. Mills
<mills@udel.edu>
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