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- Subject: Re: [chrony-users] NTP bogus timestamps - Chrony on openSUSE 15.1
- From: FUSTE Emmanuel <emmanuel.fuste@xxxxxxxxxxxxxxx>
- Date: Wed, 21 Aug 2019 14:06:54 +0000
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- Thread-topic: [chrony-users] NTP bogus timestamps - Chrony on openSUSE 15.1
Le 21/08/2019 à 16:00, James Knott a écrit :
> On 2019-08-21 09:44 AM, Miroslav Lichvar wrote:
>> It has no impact on accuracy.
> Maybe not on my local network, but what if the server was some distance
> away? I realize NTP was developed back in the days when a 56 Kb/s
> connection was really something, but even with today's high bandwidth
> connections there is some latency that would cause the client to be
> slightly behind the server. The calculations based on those time stamps
> were meant to determine that latency and correct for it.
>
> Incidentally, at work a few months ago, there was some discussion about
> NTP on a major LRT project I was working on, though I wasn't directly
> involved with the NTP servers. On this system, they have 2 GPS/NTP
> servers, at different locations, that were to be synced with 2 other
> servers. This system runs over a fibre backbone, that's 11 Km long and
> they're somewhat fussy about NTP. I had to explain, to one of my
> co-workers, how NTP worked.
>
Please, read the spec.
It is not used as you think. It has NO impact on the way the
calculations are done so no impact on accuracy.
Emmanuel.