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Date:      Sun, 30 Dec 2001 12:09:24 -0600
From:      Christopher Schulte <schulte+freebsd@nospam.schulte.org>
To:        "Casey Scott" <casey@cdstech.net>, <freebsd-questions@FreeBSD.ORG>
Subject:   Re: NTP
Message-ID:  <5.1.0.14.0.20011230115456.041ea2d8@pop3s.schulte.org>
In-Reply-To: <000001c19105$03ccc520$0301a8c0@Collosys>

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Your system's kernel securelevel is set to 2 or higher, which limits time 
changes to one second.

verify with this command

# sysctl kern.securelevel

Then see http://www.freebsd.org/cgi/man.cgi?query=securelevel&sektion=8 and
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/admin.html#SECURELEVEL

To learn more and how to fix it.

You cannot lower the securelevel while a system is running; you'll need to 
modify your rc.conf and reboot.  You can then run ntpdate to update the time.

I'd cron an ntpdate job to run every so often, so you can then bring your 
securelevel back to the original value.  Thus your clock will never be more 
than one second off and you will not run into this problem again.

At 02:38 AM 12/30/2001 -0500, Casey Scott wrote:
>
>Hello,
>
>         I am trying to set a server's clock using the command "ntpdate".
>It appears that the clock is not accurate, but the process doesn't
>adjust the time. Here is "ntpdate -v":
>
>ntpdate -d 128.10.252.7
>30 Dec 02:40:13 ntpdate[8222]: ntpdate 4.0.99b Thu Oct 25 13:03:00 EST
>2001 (1)
>transmit(128.10.252.7)
>receive(128.10.252.7)
>transmit(128.10.252.7)
>receive(128.10.252.7)
>transmit(128.10.252.7)
>receive(128.10.252.7)
>transmit(128.10.252.7)
>receive(128.10.252.7)
>transmit(128.10.252.7)
>server 128.10.252.7, port 123
>stratum 1, precision -19, leap 00, trust 000
>refid [GPS], delay 0.07053, dispersion 0.00150
>transmitted 4, in filter 4
>reference time:    bfd9427c.00000000  Sun, Dec 30 2001  2:36:28.000
>originate timestamp: bfd9427d.40342e04  Sun, Dec 30 2001  2:36:29.250
>transmit timestamp:  bfd9435e.42cfe9b7  Sun, Dec 30 2001  2:40:14.260
>filter delay:  0.09224  0.07053  0.07095  0.07202
>          0.00000  0.00000  0.00000  0.00000
>filter offset: -225.025 -225.035 -225.034 -225.034
>          0.000000 0.000000 0.000000 0.000000
>delay 0.07053, dispersion 0.00150
>offset -225.035133
>
>30 Dec 02:40:14 ntpdate[8222]: step time server 128.10.252.7 offset
>-225.035133 sec
>
>===========
>
>Syslog reports the following which may be involved:
>
>/kernel: Time adjustment clamped to -1 second
>
>==========
>
>  Neither ntpdate or ntpd seem to adjust the clock, though both indicate
>a substantial difference in times. Does anyone have any suggestions?
>
>
>Thanks,
>Casey Scott
>
>
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