[ntp:questions] Local Time

Paul.Croome at softwareag.com Paul.Croome at softwareag.com
Thu Mar 15 09:16:52 UTC 2007


To re-phrase and amplify Steve's comments:

Let's get back to basic principles. NTP propagates time through a
pyramid of
servers that are interconnected via a jittery network.

If you feed in UTC at the top of the pyramid, then all the NTP servers
tick
to the UTC clock. This is generally considered to be the most common
scenario.

If you use a computer configured with LCL-CLK as the stratum-1 server
at the top
of the pyramid, then all the NTP servers synchronize to that LCL-CLK.
Questions
relating to this scenario pop up often in this newsgroup.

But there's nothing at all in NTP that prevents you from feeding in
your own
flavour of time at the top of the pyramid. It's your decision. The
only conditions
are: firstly, your timesource should run at a rate close to 1 sec/sec;
secondly,
you must be absolutely certain that your NTP pyramid will never come
into contact
with other NTP servers that are running UTC (or vice versa; NTP
servers that are
running UTC should never come into contact with your 'contaminated'
time).

Statements like "NTP runs UTC - period" require qualification.

Paul






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