Max Nikulin wrote:
> As to a GPS receiver, it should be doable and 169.254.x.y addresses
> will not be an issue any more. Be careful with cables when connecting
> it however: https://www.wired.com/2012/02/neutrinos-faulty-cable/

CNC machines don't need accurate time.  They need precise internal
synchronization but that isn't related to the system clocks.  The
default NTP configuration in most Linux distributions will take care of
the system clocks if they have access to the Internet.  If not run an
NTP server on one machine.
-- 
John Hasler 
j...@sugarbit.com
Elmwood, WI USA

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