Re: NIST NTP servers

[Mel Beckman <mel () beckman org>]

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-on-gps/
> ) 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/