Jean-Francois Mezei <jfmezei_nanog@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. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ - I xn--zr8h punycode Lundy, Fastnet, Irish Sea, South Shannon: Northerly or northeasterly 4 or 5, occasionally 6 except in south Shannon. Slight or moderate. Mainly fair. Good, occasionally poor at first in south Lundy.