[ntp:questions] clock keeps getting behind, driftfile is 0.000

Steve Kostecke kostecke at ntp.org
Fri May 23 16:05:42 UTC 2008


On 2008-05-23, Harlan Stenn <stenn at ntp.org> wrote:

> chantal at antenna.nl writes:
>
>> the time on one of our servers is incorrect despite using ntpd, I
>> also noticed that the driftfile value is 0.000 and doesn't changed.
>> What could be the problem?
>>
>> Here is our conf file:
>>
>> restrict default kod nomodify notrap nopeer noquery
>> restrict -6 default kod nomodify notrap nopeer noquery
>> restrict 127.0.0.1
>> restrict -6 ::1
>
> Please read http://support.ntp.org/Support/AccessRestrictions .

There is nothing in the OP's restrictions which block time service.

However something else may be blocking the polls of the remote time
servers.

>> server 0.nl.pool.ntp.org
>> server 1.nl.pool.ntp.org
>> server 2.nl.pool.ntp.org
>> server 3.nl.pool.ntp.org

Those hostnames are valid and resolves to multiple IP addresses.

With these server lines it will take ntpd ~ 5 minutes to achieve initial
synchronization (assuming it is able to poll the remote time servers).
If that is not fast enough for the OP's application then 'iburst' should
be appended to the server lines and the initial sync time will be
reduced to less than 20 seconds.

Contrary to some misleading comments made in this news-group, iburst
does not unnecessarily load the remote time servers and is generally
considered acceptable to use.

>> fudge   127.127.1.0 stratum 10

That line does nothing because the Undisciplined Local Clock has not
been configured.

>> keys /etc/ntp/keys

That line does nothing because the symmetric key configuration is
imcomplete.

>> logconfig =all

Does ntp 4.2.2p1 support this configuration directive?

> You can use 'ntpq -p' to see if you are syncing to any machines.

We need to see the output of ntpq -p to be able to diagnose the OP's
problem.

-- 
Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/




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