Need trusted NTP Sources

Chris Adams cma at
Thu Feb 6 14:35:03 UTC 2014

Once upon a time, Nick Hilliard <nick at> said:
> So presuming that your company is using RH or Fedora or CentOS something,
> the auditors are claiming that Red Hat, Inc is trusted enough to provide a
> precompiled based operating system with no feasible means of proving its
> reliability, but that they're not trustworthy enough to provide a clock
> synchronisation service?

Red Hat does not provide an NTP service themselves.  The default NTP
config on a Red Hat Enterprise Linux system uses

I suppose some auditor could dislike the "openness" of
(basically anybody can join).  If that is the case, your best bet is to
do some combination of the following:

- As others have suggested, set up your own stratum-1 clock (can be done
  for around $100).  Ideally you'd set up more than one.

- Set up several servers with a static set of NTP servers rather than
  the general pool servers.  See the lists on; look
  under the docs for setting up a server to join the pool.  You don't
  have to actually join the pool, but following those docs is a good way
  to set up a stable server.

After that, point the rest of your servers at your "master" servers,
rather than the public pool.

Chris Adams <cma at>

More information about the NANOG mailing list