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 <mh...@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 > >
