[182413] in North American Network Operators' Group
Re: Speaking of NTP...
daemon@ATHENA.MIT.EDU (Rafael Possamai)
Thu Jul 16 11:55:28 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <eeb98605720a41119dfa2baef06659e9@pur-vm-exch13n1.ox.com>
From: Rafael Possamai <rafael@gav.ufsc.br>
Date: Thu, 16 Jul 2015 10:53:06 -0500
To: Matthew Huff <mhuff@ox.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Depending on how exactly you have these servers configured with relation to
one another, small variations from one single source can be augmented down
the line.
https://en.wikipedia.org/wiki/Propagation_of_uncertainty
On Mon, Jul 13, 2015 at 8:17 AM, Matthew Huff <mhuff@ox.com> wrote:
> We have 5 NTP server: 2 x stratum 1 rubidium oscillator time servers with
> GPS sync, and 3 servers running NTP 4.2.6p5-3 synced to external internet
> based NTP stratum 1 servers. We monitor our NTP environment closely, and
> over the last 10+ years, normally all of our NTP servers are sync'ed within
> +/- 2 msec. Starting last Friday, we started seeing some remote NTP servers
> with GPS reference consistently offset by 10 msec.
>
> Any one else seeing this?
>
> ----
> Matthew Huff | 1 Manhattanville Rd
> Director of Operations | Purchase, NY 10577
> OTA Management LLC | Phone: 914-460-4039
> aim: matthewbhuff | Fax: 914-694-5669
>
>
