NIST NTP servers

Fri May 13 10:08:36 UTC 2016

Jean-Francois Mezei <jfmezei_nanog at vaxination.ca> wrote:
>
> Today, if someone were to jam the GPS signal in an areas in USA, you'd
> likely hear about large number of car accidents in the news before
> noticing your systems canMt get time from the GPS-NTP and went to a
> backup ip address (nist etc).

The USA and the UK governments regularly perform GPS jamming tests, but
they do so in remote areas. See
http://www.navcen.uscg.gov/?pageName=gpsServiceInterruptions
http://stakeholders.ofcom.org.uk/spectrum/gps-jamming-exercises/
(Dunno if other governments have similar exercises.)

Tony.
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