[ntp:questions] NTP Third party client on Windows OS ?

Ryan Malayter malayter at gmail.com
Mon Sep 24 16:50:16 UTC 2007


On Sep 23, 8:25 pm, ma... at ntp.isc.org (Danny Mayer) wrote:
> Evandro Menezes wrote:
> > On Sep 18, 10:58 am, Evandro Menezes <evan... at mailinator.com> wrote:
>
> >> What I see is that with NTP the time drifts by .128s quite quickly and
> >> as soon as the stepout limit of 900s expires, time is stepped by
> >> about .5s.
>
> > Here's what I mean:http://img250.imageshack.us/img250/8264/peerstatsde3.png
> > (the flat line is for the time that the system was shutdown).
>
> > I wish that there were a way to run W32TIME and NTP at the same time
> > so that I could get the same chart using NTP Monitor, but for
> > W32TIME...
>
> w32time does not support mode 6 and mode 7 packets so it makes no
> difference. Meinberg's NTP Monitor uses those modes to fetch the
> required data. w32time is only an SNTP server and is limited in what it
> can respond to.
>
> Danny

The way I monitored NTP vs. w32time performance is to use another
system running ntpd and use the windows system with noselect and
maxpoll 6. Of course, the sntp server functionality of w32time needs
to be enabled for that to work. That might only be possible on Server
editions of windows (not sure if the registry keys for w32time server
functionality work on Windows XP or Vista).

Please see the short post and graphs at:
http://blog.malayter.com/2006/05/windows-2003-sp1-has-real-ntp-service.html

You can also just mointor from the Windows client, and run the built
in windows command 'w32tm' in a loop in a batch file and record the
results for later analysis, but I have no idea how good the data would
actually be:
  C:\>w32tm /monitor /computers:0.us.pool.ntp.org
  0.us.pool.ntp.org [155.97.17.169]:
      ICMP: 50ms delay.
      NTP: +0.0102014s offset from local clock
          RefID: time-b.utah.edu [155.97.154.154]




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