NIST NTP servers

Mel Beckman mel at
Wed May 11 14:30:12 UTC 2016


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 at> wrote:
> I hope your receivers aren't all from a single source.
> I was in Iraq when this (
> ) 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 at> 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 at
>> PGP keys at

More information about the NANOG mailing list