Kevin Golder wrote:
Well, while playing I found that if you use the ntpdc 'addserver'
command and place a integer in place of the 'prefer' option it uses that
as the minpoll value. If you enter an incorrect integer it spits out
that you've used an invalid minpoll value. I didn't see this minpoll
argument documented anywhere and haven't been successful finding a way
to edit the maxpoll.
What problem are you trying to solve by adjusting Minpoll and/or
Maxpoll?
I'm not the end user, so I don't have a good answer for that, expect for
saying the customer is always right :-)
Kevin
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Richard B.
Gilbert
Sent: Thursday, January 05, 2006 3:37 PM
To: [email protected]
Subject: Re: Setting maxpoll interval with 'ntpdc'
Kevin Golder wrote:
I just have a question about the ntpdc utility. I can add and delete
servers fine using ntpdc, but how do I edit their minpoll and maxpoll
settings?
Thanks for any help,
Kevin
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What problem are you trying to solve by adjusting Minpoll and/or
Maxpoll?
I don't believe you can, or should do this. Ntpd selects the poll
interval within the range specified by the default values for Minpoll
and Maxpoll. The defaults are correct for most circumstances. The
only exception that occurs to me is a dial-up connection to a server;
such servers are polled much less often than broadband connections.
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I said "I don't think you can" because, AFAIK, ntpdc does not support
this. MINPOLL and MAXPOLL default to 6 (64 seconds) and 10 (1024
seconds) respectively. Again AFAIK, the only supported way to alter the
defaults is via the /etc/ntp.conf file; the server statements support
MINPOLL and MAXPOLL options.
If you can't educate the customer, then set the MINPOLL/MAXPOLL values
the way he wants them. The timekeeping performance of ntpd will almost
certainly suffer when compared to the results obtained using the defaults.
An oversimplified explanation of the selection of polling intervals is
that the lower values are used to correct large errors quickly while the
longer intervals allow ntpd to correct small errors more accurately.
Ntpd normally starts polling at 64 second intervals and increases the
polling interval to an optimum value for the particular situation. In
more or less "normal" circumstances the polling interval will be 1024
seconds or, possibly, 512 seconds.
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