[time-nuts] Embedded NTP servers?

Sarah White kuzetsa at gmail.com
Sun Aug 19 18:25:03 UTC 2012

If your design gets off the ground, I'd surely try to replicate it from
your part list or buy a kit from you or whatever. Sounds great.

On 8/19/2012 2:19 PM, Michael Tharp wrote:
> On 08/19/2012 01:38 PM, Chris Albertson wrote:
>> NTP is not as easy as you think.  Just doing the cryptography to handle
>> authentication is more then I would want to write.  When a free open
>> source
>> ntpd exists it will be really hard to get people to help work on
>> re-inventing it.  But your idea to use a GPSDO to drive the system
>> clock is
>> good.  People have done that and it works. You basically unsolder a TTL
>> "can oscillator" and put a small connector in it's place.
> This is specifically *not* a full ntp implementation. There's no client,
> no PLLs or clock correction, nothing but using 10MHz+PPS+NMEA to feed an
> internal clock and serving it out over ntp to more intelligent clients.
> I haven't written any code yet but from nosing around in wireshark it
> seems like the ntp part of the project wouldn't take more than an hour
> or two to write. The only tricky part is keeping a calendar so it knows
> when to insert a leap second.
> I'm not initially interested in authentication, although I do have all
> my PCs at home running in authenticated broadcast mode. So I might add
> auth later so it can participate, but I would be satisfied without it.
> -- m. tharp
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