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Langue: en

Version: 385296 (fedora - 01/12/10)

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Section: 8 (Commandes administrateur)


ntptrace - trace a chain of NTP servers back to the primary source



ntptrace [ -n ] [ -m maxhosts ] [ server ]


ntptrace is a perl script that uses the ntpq utility program to follow the chain of NTP servers from a given host back to the primary time source. For ntptrace to work properly, each of these servers must implement the NTP Control and Monitoring Protocol specified in RFC 1305 and enable NTP Mode 6 packets.

If given no arguments, ntptrace starts with localhost[char46] Here is an example of the output from ntptrace:

 % ntptrace
 localhost: stratum 4, offset 0.0019529, synch distance 0.144135 stratum 2, offset 0.0124263, synch distance 0.115784 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 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.


Turns off the printing of host names; instead, host IP addresses are given. This may be useful if a nameserver is down.


This program makes no attempt to improve accuracy by doing multiple samples.



HTML documentation in ntp-doc package.

This file was automatically generated from HTML source.

JCB: "premiers-pas" c'est une enseigne [] pour les gens un peu paumés
LW: Sans compter qu'un groupe spécifique pour les questions des FAQ
permet de réaliser un robot qui maile 'RTFM' à chaque intervant.
-+- Laurent in guide du Linuxien pervers - "Soyons pratiques !" -+-