[CentOS] NTP problems

Anne Wilson cannewilson at googlemail.com
Sat Nov 15 15:11:59 UTC 2008

On Saturday 15 November 2008 14:19:12 Dirk H. Schulz wrote:
> Anne,
> please check your /etc/ntp.conf for the "server" statement; CentOS original
> is
> > server 0.rhel.pool.ntp.org
> > server 1.rhel.pool.ntp.org
> > server 2.rhel.pool.ntp.org
My config file says

server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org

> These 2 server ips you listed do not belong to this pool (you can check via
> dns), and resolved backwardly their names do not sound like they are ntp
> servers.
One is the University of Potsdam, which seems a likely pool member.  The other 
is the National Information Infrastucture Development Office in Budapest - 
again, I would not think that too unlikely.

> You should find out why your ntp tries to send to them (and what).
The zones are listed at http://www.pool.ntp.org/zone/europe but I have no idea 
how to find out which servers are in each pool.

In fact it is not the same addresses each day.  The day before I mentioned it, 
the report gave the IP of Research Machines, in Oxfordshire.  Again, a likely 
member of a pool.

> The "total synchronizations ..." line at least seems to say that your ntp
> sync works - you could check that with ntpdate against a server from the
> above pool to be sure.
I'll do that, thanks.


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