[ntp:questions] Re: ntp linux daemon drift apart from Windows Net Time Server

DavidO davidproc at hotmail.com
Fri Jun 2 23:32:51 UTC 2006


All:
Thanks for your suggestions:

I can sycnhronize without any problem with linux machines.
The problem is that we worked with embedded units using linux and
sometimes these units can only syncronize with one computer (The
relation has to be one to one).
Now, some of the time servers can be either linux or windows. Our linux
systems should be able to synchronize to computers that can have either
linux or windows operating systems.
Anyway, I was wondering if somebody know what is the OLDEST windows
time server version that can synchronize with linux ntpd version 4.2.
Also, I was wondering if anybody has been able to synchronize to an
SNTP windows version from a linux ntp 4.2 version.

Thanks,

David O



Danny Mayer wrote:
> DavidO wrote:
> > Hi:
> > I am trying to synchronize a linux (ntp version 4) box to an NT server
> > (w32tm).
>
> That's not a good thing to do. The NT server is running SNTP and not NTP.
>
> > I set up the registry keys of my second unit as follows:
> > - The windows XP box is a server.
> > - The windows XP box takes time from: Public reliable external source.
> > (216.34.94.18, or time.windows.com).
> >
>
> What's reliable about it. It's getting its time from a single source and
> assumes that it's right and it checks about twice? a day. That's no way
> to run an NTP server.
>
> >
> > Now, when I run the ntpd in my linux box, the unit receives packets
> > from the window box but it looks like the clock filter is rejecting the
> > packet and it does not update the linux box.
>
> Not surprising considering that you are only using one server and it has
> no way of knowing how reliable the returned NTP time is.
>
> > When running in ntpd -d, I get the following messages:
> >
>
> You didn't say what version you are using.
>
> >
> > The dispersion, the jitter, and the offset levels start increasing.
> > When I run ntpq -p, it shows:
> >
> >      remote           refid      st t when poll reach   delay   offset
> > jitter
> > ==============================================================================
> >  192.168.10.246  207.46.232.189   3 u    5   64    3    0.437  -15.273
> >  4.956
> >
> > The linux box can see the  windows box but the linux box NEVER
> > synchronizes with the other one.
> > After a while the linux start drifting apart.
>
> That's what the above is telling you.
>
> >
> > I have been reading different articles and I have tried to modified ntp
> > configurations from both sides without any success. I will really
> > appreciate (it is really needed for my company) any help from anybody,
> >
>
> Start by setting up your linux box with NTP pointing to 4-5 external NTP
> servers and forget about windows. If necessary you can later point the
> windows box to the linux box. You should never be doing it the other way
> round unless you are running NTP on the windows box.
>
> Danny
> _______________________________________________
> questions mailing list
> questions at lists.ntp.isc.org
> https://lists.ntp.isc.org/mailman/listinfo/questions




More information about the questions mailing list