ntptrace- trace a chain of NTP servers back to the primary source
ntptrace [ -vdn ] [ -r retries ] [ -t timeout ] [
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 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 (left to right): the host name, the host
stratum, the time offset between that host and the local host (as
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
This program makes no attempt to improve accuracy by doing multiple samples.