[ntp:questions] Client using Meinberg NTP can't sync with ntp server problem

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Sat Jul 12 02:10:40 UTC 2014

On 2014-07-11 00:51, vothanhhung22 at gmail.com wrote:
> Hi all,
> I read and followed as the link Martin suggest and I tried to
> find the latest version. Can you check for me if this link is
> the latest because I tried this link but it is not working.
> I tried set minpool to 9 but it doesn't work.
pool hk.pool.ntp.org iburst minpoll 6 maxpoll 6
pool tw.pool.ntp.org iburst minpoll 6 maxpoll 6

> Here is the link: http://www.satsignal.eu/ntp/x86/ntp-4.2.7p447-win-x86-bin-djt.zip
> In my case (as  William explained) it is not a normal clock rate
> sync but just a copy time from ntp server to machine clock.
> So what I am wondering now is if it is right in my situation to
>use ntp to "sync" from ntp server.
> The machine I am trying to "sync" is a VPS machine.

Search for "ntp under Xen OR KVM" or substitute your platform.
You have to find out what your platform is, whether your
provider syncs the domain and host time with NTP, what service
level and timing facilities are provided.

If the domain and host time is not synced with NTP, as is
common in Windows domains, you probably have no chance, as
the platform time may appear to jump and/or drift any old
way, and NTP requires a stable hardware base to work from.

> I still don't get the point William explained that "you cannot
> "force it to sync every 10 min" that is not how it works".
> Can you explain me more?

NTPd when started with -g steps your system within 128ms of UTC
then disciplines the rate at which the system sees time passing
to get the offset closer to UTC.
It decides how often it needs to request information and make
corrections depending on how it sees your platform behaving.

How close you get to UTC depends on the stability of your OS,
hardware, and time sources, so may be ms with network sources
or Windows, us with hardware reference clocks (e.g. GPS with PPS),
or ns with BSD on embedded systems (e.g. Soekris) with time nut
level hardware (e.g. Trimble Thunderbolt) and external antennas
(e.g. survey quality) with a good view of the sky (no trees or
buildings nearby and above the level of the antenna). YMMV

Take care. Thanks, Brian Inglis

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