[158104] in North American Network Operators' Group
Re: Picking outside NTP servers (Re: NTP Issues Today)
daemon@ATHENA.MIT.EDU (Majdi S. Abbas)
Tue Nov 20 18:22:55 2012
Date: Tue, 20 Nov 2012 18:22:35 -0500
From: "Majdi S. Abbas" <msa@latt.net>
To: Jay Ashworth <jra@baylink.com>
In-Reply-To: <21449665.36010.1353448419775.JavaMail.root@benjamin.baylink.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Tue, Nov 20, 2012 at 04:53:39PM -0500, Jay Ashworth wrote:
> For myself, I usually pick the first three in us.pool.ntp.org, tick and tock,
> time.nist.gov, and a couple of regionally appropriate large universities.
I'd advise going through the RR for a while, and pick servers
close to you. ntpd won't select a server that's more than 128ms away.
It also degrades accuracy. Select for minimum latency, as well as
a diverse set of sources. [Watch their refid over time, and make sure
they aren't slaving to the same set of servers, as well as others
you may be using.]
It requires a bit of effort, but over time you get an idea what
public time servers are close to each of your locations, and diverse
from each other.
--msa
