"jdow" <jdow@xxxxxxxxxxxxx> wrote:
From: "Rob Brown-Bayliss" <uncertain.genius@xxxxxxxxx>
On 10/7/06, Rob Brown-Bayliss <uncertain.genius@xxxxxxxxx> wrote:
Hi, I noticed this aftetrnoon that my system clock is about 23 minutes
fast. I ma using ntpd, and earlier today it was reporting the correct
time.
In the last few mins the time has corrected it's self. But can UI
trust the system clock any more?
You can answer that for yourself by using ntpq.
From the ntpq prompt "peers" is interesting. It allows other perhaps
less interesting commands like "assoc" and exploration of the parameters.
The command "ntpq -p" simply returns the peers list.
Monitor this for extended periods and see why your system wanders off.
It requires a day or two of continuous online time for ntpd to fully
characterize your system and get the clock in line so that long periods
off line (a day or so) involve no traumatic corrections or errors.
{^_^}
You can also try the ntptrace command. You should see something like:
# ntptrace
localhost.localdomain: stratum 4, offset 0.000022, synch distance 0.234200
mutilate.local.davenjudy.org: stratum 3, offset -0.010917, synch
distance 0.203775
vine.desynched.net: stratum 2, offset 0.000191, synch distance 0.096220
time-C.timefreq.bldrdoc.gov: stratum 1, offset 0.000000, synch distance
0.002650, refid 'ACTS'
If all you see is something about "127.127.1.0 stratum 10", your ntpd is
unable to find a time source so you're running from the system clock.
Also, ntp only syncs the system clock at shutdown. If you leave your
system up but drop your network connection, ntp will do its best using
the system clock but don't expect much. Finally, ntp will only slowly
correct the reported time to prevent discontinuities. It should not
have changed the time by 23 minutes over only a few hours. You may have
something else going on.
Here's a link that may help: http://www.ntp.org/ntpfaq/NTP-s-trouble.htm
Cheers,
Dave
--
Politics, n. Strife of interests masquerading as a contest of principles.
-- Ambrose Bierce
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