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Trace a chain of NTP servers
ntptrace [-dnv] [-r retries] [-t timeout] [server]
Neutrino
- -d
- Turn on debugging output.
- -n
- Print only the host IP addresses, not the host names.
- -r retries
- Set the number of retransmission attempts for each host. The default value is 5.
- -t timeout
- Set the value of retransmission timeout in seconds. The default value is 2.
- -v
- Print verbose information about the NTP servers.
The ntptrace utility determines the source of time for
the NTP (Network Time Protocol) servers. It follows the chain of NTP servers back to their
master time source. If you don't specify a server, it starts with the localhost.
$ ntptrace
Here's an example of the diagonistic output from the ntptrace
utility:
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 printed from left to right: the host name, the host
stratum, the time offset between that host and the local host, the host
synchronization distance, and the reference clock ID. Note that all times
are expressed in seconds, and the time offset mentioned is not always zero.
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.
The ntptrace utility can't improve accuracy by doing multiple
samples.
ntpd,
ntpdate,
ntpdc,
ntpq
Based on RFC 1305
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