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Using my own NTP server for precise time synchronization

I set up my NTP server on Ubuntu and OPNsense for accurate time synchronization across all devices on my local network.
EDN

LED Clock as NTP Server with DCF77

Based on an Atmel AVR microcontroller with 8kB flash, the LED clock uses a German time signal in the form of DCF77 Receiver as it was connected to an Ethernet network to serve as a NTP server while ...