nanog mailing list archives
Re: NIST NTP servers
From: Jean-Francois Mezei <jfmezei_nanog () vaxination ca>
Date: Thu, 12 May 2016 13:06:35 -0400
On 2016-05-10 10:59, Stephane Bortzmeyer wrote:
Yes, but they may switch it off for civilian use (by going encrypted, for instance) at any time, if it is better for *their* operations.
In the days of selected availability (GPS precision reduced on purpose), the time signal was still very accurate from the point of view of using it as a time source for computers. When Clinton lifted SA, the military reserved the right to re-instate it, and stated that it reserves the right to kill the civilian signal outside the USA. The EU considered launching their own constellation to counter the US possibiliy of a shutdown. Russia launched Glonass and eliminated the need for EU to launch their own. With Glonass now fairly common in GPS receivers, the USA can't unilaterally shut it down anymore. A satellite that is visible from Syria couldn't shutdown its signal without affecting a WHOLE lot of other areas. It is more likely that the USA would just jam the frequencies from a plane over Syria or some other means to geographically block those frequencies. 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).
Current thread:
- Re: NIST NTP servers, (continued)
- Re: NIST NTP servers Mel Beckman (May 09)
- Re: NIST NTP servers Spencer Ryan (May 09)
- Re: NIST NTP servers Majdi S. Abbas (May 09)
- Re: NIST NTP servers Steven Miano (May 10)
- Re: NIST NTP servers Stephane Bortzmeyer (May 10)
- Re: NIST NTP servers Valdis . Kletnieks (May 10)
- Re: NIST NTP servers Stephane Bortzmeyer (May 10)
- Re: NIST NTP servers Josh Reynolds (May 10)
- Message not available
- Re: NIST NTP servers Valdis . Kletnieks (May 10)
- Re: NIST NTP servers Eygene Ryabinkin (May 11)
- Re: NIST NTP servers Jean-Francois Mezei (May 12)
- Re: NIST NTP servers Tony Finch (May 13)
- Re: NIST NTP servers Mel Beckman (May 09)
- Re: NIST NTP servers Ryan Harden (May 11)
- RE: NIST NTP servers Chuck Church (May 10)
- Re: NIST NTP servers Gary E. Miller (May 10)
- Re: NIST NTP servers Jared Mauch (May 10)
- RE: NIST NTP servers Chuck Church (May 10)
- Re: NIST NTP servers Gary E. Miller (May 10)
- Re: NIST NTP servers Mel Beckman (May 10)
- Re: NIST NTP servers Leo Bicknell (May 11)
- Re: NIST NTP servers Josh Reynolds (May 11)