Speaking of NTP...

Thu Jul 16 15:53:06 UTC 2015

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 at 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
>
>