[ntp:questions] Windows NTP Internet & fault-tolerance (multiple NTP servers)

Danny Mayer mayer at ntp.isc.org
Thu Nov 17 03:00:03 UTC 2005

michaelw wrote:
> Hopefully I'm in the right group.  Microsoft states in KB884776
> "Configuring the Windows Time service against a large time offset"
> "We highly recommend that you configure the authoritative time server
> to gather the time from a hardware source. When you configure the
> authoritative time server to sync with an Internet time source, there
> is no authentication."
> I suppose here MS are warning against possible spoofing of time
> servers.  Has anyone heard anything in relation to this issue, or have
> a better idea of what Microsoft means here?

Microsoft only supports SNTP and incorrectly at that. I don't recommend
anyone to run Microsoft's implementation, though I am of course prejudiced.

> Also from the FAQ for protocols.time.ntp
> (http://www.ntp.org/ntpfaq/NTP-s-def.htm):
> NTP is a fault-tolerant protocol that will automatically select the
> best of several available time sources to synchronize to. Multiple
> candidates can be combined to minimize the accumulated error.
> Temporarily or permanently insane time sources will be detected and
> avoided.

This is the implementation that this mailing list/newsgroup deals with.

> I'd like to hear from people who have had experience configuring
> multiple external NTP Servers (ie fault tolerance) for Windows NTP,
> either for Windows 2000 or 2003.  How did you set it up and what sort
> of results have you had?

Meinberg has created an excellent installer for this implementation of
NTP and helps you set up your configuration file. If you don't want to
go through the pain of doing this by hand it's an excellent choice.

> Cheers
> Michael
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