[ntp:questions] Re: NTP vanished!

W. D. NewsGroups at US-Webmasters.com
Wed Oct 6 17:55:11 UTC 2004


Richard B. Gilbert wrote:
> W. D. wrote:
> >At 22:16 10/5/2004, Harlan Stenn, wrote:
> >
> >>>>I recommend you use "ntpd -g" (NOT ntpdate)
> >>>>
> >>>Why?
> >>>
> >>ntpdate is broken and deprecated.
> >
> >OK, but how?  I've looked at all the docs I can find.
> ><snip>
> >
> >>>>and use "iburst" on your server

> >Great!  Will do.  Has been taking quite a while
> >to synch up.  How long does it usually take
> >to synch up using iburst?  My broadcast signals
> >don't go out until the server is synched.
> >
> iburst causes the client to send eight request packets with two second
> spacing between them at startup.  This allows ntpd to fill the
> processing pipeline and get a reasonable idea of the round trip delay to
> the server and what time it is.  This happens in 2*8 = 16 seconds
> (longer if you are using a dialup connection).  Without it, you need
> eight minutes and thirty-two seconds to get to a similar state.   ntpd
> will need a much longer interval to accurately determine the frequency
> error of your clock and begin the process of correcting it.  It may
> spend eight or ten minutes watching your clock drift before calculating
> and applying a preliminary correction.  It will then resume watching the
> clock drift and will eventually calculate and apply a new, and hopefully
> much smaller correction.  It might take as much as twenty-four hours to
> get your system keeping the best time it is capable of but you should be
> in pretty good shape within  twenty or thirty minutes.

Thanks Richard (and Harlan)!  I tried it and it synchronizes much
faster.



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