NTP
NTP Infrastructure
History: Over the years it has been evolving, changing. We used to use outside NTP, from the WWW , then one, and later a second member provided NTP. One via a Stratum-1 server (Antenna getting PPS via two u-blox receivers) the other one as a stratum-2 (chrony). Those 2 members moved on and another member started a new project at his "home lab" to provide NTP stratum-1. We have now setup some NTP server using chrony and we have the member's project online (GPS PPS NTP/chrony server with a NEO 7M GPS unit on a raspberry Pi.)
Use 10.10.10.123 as your NTP server address.
What is NTP
The Network Time Protocol is a "network" protocol for devices to synch their clocks. See Wiki
IP
10.10.10.123 - NTP for the mesh ( Use this one )
NTP stats and status
Here are some stats on the NTP servers:
to be added.
Alternatives
There are many NTP servers on the Net, google offers it, some hardware maker such as Ubiquiti, etc..