From owner-freebsd-questions  Mon Jan  7 11:49: 7 2002
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Date: Mon, 07 Jan 2002 13:47:37 -0600
To: freebsd-questions@freebsd.org
From: Oscar Ricardo Silva <oscars@mail.utexas.edu>
Subject: ntp server on FreeBSD drifting
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X-Loop: FreeBSD.ORG

We're currently running ntpd on several FreeBSD machines (FreeBSD versions 
4.0 and 4.3 and ntp versions 4.0.9x).  For some reason, although all of 
them are getting their time from the same sources, one of them consistently 
drifts and so advertises the wrong time.  I have noticed that the 
/etc/ntp.drift files on the machines are different but haven't gotten my 
mind around what that actually means, the two correct ones have ntp.drift 
of -7.731, -6.280 and the off one has -500.00.

Here's the /etc/ntp.conf file (same on all three except for the peer 
statements):

driftfile       /etc/ntp.drift

disable         auth monitor

server          time.ots.utexas.edu     prefer
server          tick.uh.edu
server          tick.greyware.com
peer            dnscache1.ots.utexas.edu
peer            dnscache3.ots.utexas.edu
peer            ntp.cc.utexas.edu

# by default, don't trust or allow modification
restrict default notrust nomodify

# Restrict to only our networks
restrict 128.83.0.0 mask 255.255.0.0 nomodify
restrict 146.6.0.0 mask 255.255.0.0 nomodify
restrict 129.116.0.0 mask 255.255.0.0 nomodify
restrict 129.110.0.0 mask 255.255.0.0 nomodify
restrict 206.77.62.0 mask 255.255.255.0 nomodify
restrict 206.77.63.0 mask 255.255.255.0 nomodify

restrict 127.0.0.1
restrict 128.83.3.90


Any thoughts/suggestions/pointers?


Oscar


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