How do I enable ntpd to serve ntp clients (using macOS 10.14 Mojave)?
Solution 1:
From Macrumors (in the Mojave 'All the little things' thread):
Time sync: ntpd has been replaced by timed: not the old school unix one, but a new apple invention.
Have linked the timed Man page for ya:
https://www.unix.com/man-page/mojave/8/timed/
Solution 2:
So I found the best solution for my situation. I ended up installed Docker CE for Mac, then running a docker instance of NTP. This achieved the desired results of getting an NTP service running on a the segregated network segment without having to have it routable to the internet.
Docker CE for Mac
docker NTP container on github