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Top Forums UNIX for Dummies Questions & Answers Timekeeping in Linux question ... Post 302516685 by newlinuxuser1 on Sunday 24th of April 2011 09:46:22 PM
Old 04-24-2011
Perderabo,

I get your example with two car, however, I have to have some trust in a meter, as the meter is all what I see in a car. And it appears at present, that it is all I have to evaluate the time, (rpm) in your example. How can I know that it works as it should, if the meter doesn't show a correct info by definition. Can you see what I mean? How can I say that I trust the NTP server, if my RPM meter is defective?

Breaking away from car thing, how can I tell if the NTP server does a good job? And by the way, there are many NTP servers... So is there one "super NTP" server that feeds its time reading to all other? Should I say "root" NTP server, or may be reference NTP server. Do you prefer some servers over other? Or I'm too concerned about it?

I assume that close we on a net to a server, then better time reading we get, as less delay is introduced by a network.
 

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Net::NTP(3pm)						User Contributed Perl Documentation					     Net::NTP(3pm)

NAME
Net::NTP - Perl extension for decoding NTP server responses SYNOPSIS
use Net::NTP qw(get_ntp_response); my %response = get_ntp_response(); ABSTRACT
All this module does is send a packet to an NTP server and then decode the packet received into it's respective parts - as outlined in RFC1305 and RFC2030. DESCRIPTION
This module exports a single method (get_ntp_response) and returns an associative array based upon RFC1305 and RFC2030. The response from the server is "humanized" to a point that further processing of the information received from the server can be manipulated. For example: timestamps are in epoch, so one could use the localtime function to produce an even more "human" representation of the timestamp. EXPORT get_ntp_response(<server>, <port>); This module exports a single method - get_ntp_response. It takes the server as the first argument (localhost is the default) and port to send/recieve the packets (ntp or 123 bu default). It returns an associative array of the various parts of the packet as outlined in RFC1305. It "normalizes" or "humanizes" various parts of the packet. For example: all the timestamps are in epoch, NOT hexidecimal. SEE ALSO
perl, IO::Socket, RFC1305, RFC2030 AUTHOR
Now maintained by Ask BjA~Xrn Hansen, <ask@develooper.com<gt> Originally by James G. Willmore, <jwillmore (at) adelphia.net<gt> or <owner (at) ljcomputing.net<gt> Special thanks to Ralf D. Kloth <ralf (at) qrq.de<gt> for the code to decode NTP packets. COPYRIGHT AND LICENSE
Copyright 2009 by Ask BjA~Xrn Hansen; 2004 by James G. Willmore This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2011-06-05 Net::NTP(3pm)
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