[ntp:questions] Re: The classic "no server suitable for synchronization found" error on my ntpd server.
Richard B. Gilbert
rgilbert88 at comcast.net
Fri Apr 28 16:45:01 UTC 2006
> I've removed all restrict statements, and the same thing is still
> occuring. One thing I've looked at, that may help me widdle down this
> issue a little more, from a remote computer, I ran ntpd -ud <serverip>
> . In the output, I see "Server dropped: strata too high".
> What would be causing my strata to be too high? It is showing my
> stratum to be 16.
"Stratum 16" means that the server is not synchronized! It suggests
that the server has lost contact with its own servers.
NTP is hierarchical! At the top of the hierarchy are the atomic clocks
at various national standards laboratories. Stratum 1 servers get time
directly from such an atomic clock. The connection may be a few feet of
cable or a radio broadcast from a GPS satellite; IOW it is one "hop"
away from the atomic clock.
Stratum 2 servers get their time from stratum 1 servers.
Your stratum 16 server is getting its time from its wrist watch; it may
or may not be correct but it has lost its place, or may not ever have
had a place, in the hierarchy.
There are sites that, for one reason or another, do not or cannot have
an internet connection and cannot or will not use a hardware reference
clock such as a GPS receiver, WWV receiver, or WWVB receiver. The
latest version of ntpd supports an "orphan mode" that, as I understand
it, will allow them to synchronize clocks but does not guarantee correct
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