OpenNTPD is an independent partial re-implementation of
NTP. It aims to be a simple, reliable, and highly secure implementation.
Related Topics: the OpenNTPD project site
Limitations
- OpenNTPD does not have micro-second accuracy as a design goal
- Unicast only; Multicast/Manycast/Broadcast modes not supported
- No suport for NTP Authentication
- No support for Reference Clocks