[ntp:questions] Question on how to Slew time in NTP (David Woolley)

Charles Elliott elliott.ch at verizon.net
Thu Dec 15 13:07:41 UTC 2011


> has the authentication in place to allow it to be added on the fly, the
> biggest hit to the time will be that from stopping and starting ntpd,
> to
> change the configuration.

So true!  Are there simple instructions somewhere to allow one to 
setup NTPD so that ntpq.exe or ntpdc.exe can be used to change
the configuration on the fly, or can someone just post a few
lines here to tell how to do it?

Please!

Charles Elliott

> -----Original Message-----
> From: questions-bounces+elliott.ch=verizon.net at lists.ntp.org
> [mailto:questions-bounces+elliott.ch=verizon.net at lists.ntp.org] On
> Behalf Of David Woolley
> Sent: Wednesday, December 14, 2011 5:43 PM
> To: questions at lists.ntp.org
> Subject: Re: [ntp:questions] Question on how to Slew time in NTP (David
> Woolley)
> 
> Steve Kostecke wrote:
> 
> >
> > ntpd can normally keep your clock well within 10 ms of WAN (e.g.
> > Internet) time servers, 5 ms of a LAN time server, and 0.01 ms of a
> > direcly connected GPS ref-clock. Assuming that all of your time
> sources
> > are ultimately synced to UTC the differences between them will be
> well
> > within the slew/step threshold and your application won't notice a
> > change in "sys_peer" (i.e. the time source you are "synced" to).
> >
> 
> Of course, if he hasn't either got the replacement server configured,
> or
> has the authentication in place to allow it to be added on the fly, the
> biggest hit to the time will be that from stopping and starting ntpd,
> to
> change the configuration.
> 
> Steve has put "synced" in quotes, because ntpd actually syncs to a
> composite time from all the good servers, but needs to nominate one as
> the figurehead server.
> 
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