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from Alice’s Adventures in Wonderland, Lewis Carroll The rabbit knows the way back. |
1. Manual Pages
2. Table of Contents
3. SYNOPSIS
ntptrace[-V|--version] [-n|--numeric] [-mnumber |--max-hosts=number] [-rhost |--host=remote] hostname
4. DESCRIPTION
ntptrace is a python 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 control packets. Nowadays it is usual for
public timeservers to disable Mode 6 queries, so this script is
unlikely to be very useful unless you have a collection of
specially-configured timeservers on your LAN.
If given no arguments, ntptrace 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 'GPS'
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.
5. OPTIONS
-n,--numeric-
Print IP addresses instead of hostnames.
Output hosts as dotted-quad numeric format rather than converting to the canonical host names.
-mnumber,--max-hosts=number-
Maximum number of peers to trace. This option takes an integer number as its argument. The default number for this option is 99.
-rstring,--host=string-
Trace a single remote host.
-V,--version-
Print the version string and exit.
