Josh, Read deeper into the thread and you'll find where I sourced inexpensive RF-based NTP servers using CDMA, GSM, and even WWV. All radically different technologies that are unlikely to have common failure modes. But yes, buying different brands can't hurt either. -mel beckman
On May 11, 2016, at 7:15 AM, Josh Reynolds <josh@kyneticwifi.com> wrote:
I hope your receivers aren't all from a single source.
I was in Iraq when this ( http://dailycaller.com/2010/06/01/glitch-shows-how-much-us-military-relies-o... ) happened, which meant I had no GPS guided indirect fire assets for 2 weeks.
On Wed, May 11, 2016 at 8:31 AM, Leo Bicknell <bicknell@ufp.org> wrote: In a message written on Tue, May 10, 2016 at 08:23:04PM +0000, Mel Beckman wrote:
All because of misplaced trust in a tiny UDP packet that can worm its way into your network from anywhere on the Internet.
I say you’re crazy if you don’t run a GPS-based NTP server, especially given that they cost as little as $300 for very solid gear. Heck, get two or three!
You're replacing one single point of failure with another.
Personally, my network gets NTP from 14 stratum 1 sources right now. You, and the hacker, do not know which ones. You have to guess at least 8 to get me to move to your "hacked" time. Good luck.
Redundancy is the solution, not a new single point of failure. GPS can be part of the redundancy, not a sole solution.
-- Leo Bicknell - bicknell@ufp.org PGP keys at http://www.ufp.org/~bicknell/