[ntp:questions] Re: Can sychronize with a slightyly different NTP versios

Danny Mayer mayer at ntp.isc.org
Sun Mar 5 01:43:51 UTC 2006

DavidO wrote:
> Thanks all for your suggestions:
> I did try different stratums for the server 10, 12, 2, 3, 5 and still
> did not get the other units to sunc with it.
> Since it was really needed for our units to synchronized with each
> other, I downloaded the latest stable version from the web (4.2) I
> cross compiled for our power-pc units and now I do not have that
> problem anymore. So, I guess...  PROBLEM SOLVED.
> There is a problem in all the versions of NTP that I have seen.
> Whenever a unit boots up and queries time from a server, the unit can
> be sync in 11-15 seconds depending on the configuration, but if the
> unit starts serving its own time, the unit takes between 1 to three
> minutes to get in sync with itself. Basically, the main reason for that
> is that I can not use the ntpdate command to my own local address (ex:
> "ntpdate" and "ntpdate localhost" are not possbile), BUT
> the unit is serving time to itself, the unit should come up already in
> sync since it is  querying time from its OWN clock. Probably that I
> have the source code and I can compiles I can tweak that way.

Think carefully about what you wrote. Do you have any idea what ntpdate
does and why it makes no sense to run it against yourself? You are
already synchronized against yourself (using the word synchronized very
loosely) and in fact if you were to do this, because of the time it
takes just to go through the loopback you would actually end up making
the clock further off every time you ran it. On top of that you can only
run ntpdate against a system running ntpd but on your own system you
cannot be doing both at the same time. It's even more dangerous to have
two different applications, or two different processes running the same
application, modifying the clock.

In summary what you wrote makes no sense.


> David Olave
> Design Engineer
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