[ntp:questions] Fwd: Re: Best ways to get the reference times from ntp

William Unruh unruh at invalid.ca
Wed May 7 19:40:28 UTC 2014


On 2014-05-07, mike cook <michael.cook at sfr.fr> wrote:
>
> Le 7 mai 2014 ? 18:32, William Unruh a ?crit :
>> <snip>
>> Not much more. But, lets play. 
>> The short answer is no, ntpd cannot play this game. You are trying to
>> use A to discipline not only B but C as well but on machine B.
>
> My reading is that C is not being disciplined at all, but is to be used a reference (though non UTC) for B.

That is my reading as well. But something must be done to determine
those values of x and y (Ctime= xT+y where T is UTC). Either that can be
done on C using something like chrony (better) or ntpd, or B could run
something to determine x and y for C and use those to help discipline B. 

But neither ntpd or chrony has any way of doing it (unless you somehow
use they "simulation" packages to do so. Ie, both have simulators which
will simulte a clock and the discipline of that clock by ntpd/chrony. If
you feed that simulator the readings from C by B and from A by B, then you could use
that to estimate x and y. 
 But basically it would require the user to code that up. 

>
><snip>
>
>
>
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