======ntp======

I remember looking at this circa 2016 - 2021 and letting go at that time,  crony had just been released and systemd was still relatively new at that time. 
=====systemd commands=====
  *sudo systemctl status systemd-timesyncd
    *The default configuration is shown in ''/etc/systemd/timesyncd.conf'' (All the defaults are shown commented out)
    *Copy the default configuration in ''/etc/systemd/timesyncd.conf'' to ''/etc/systemd/timesyncd.conf.d/timesyncd.conf'' and modify options in ''/etc/systemd/timesyncd.conf.d/timesyncd.conf''
  *timedatectl timesync-status

=====ntp servers=====
ntp servers can be checked using the ''ntpdate'' command, which can be loaded in Debian with ''sudo apt install ntpsec-ntpdate''

Ranked by testing with ''sudo ntpdate -q {ntp servername/ip}''
^ sync ^ accuracy ^ server ^ ip address ^ stratum ^ leap status ^
| +0.018040 | +/- 0.026068 | nets.org.sg | 129.126.239.115 | s1 | no-leap |
| +0.020117 | +/- 0.027653 | 3.au.pool.ntp.org | 103.126.53.123 | s2 | no-leap |
| +0.020819 | +/- 0.027315 | 0.au.pool.ntp.org | <wrap hi>139.99.135.247</wrap> | s2 | no-leap |
| +0.050351 | +/- 0.064718 | 1.au.pool.ntp.org | 180.150.8.191 | s1 | no-leap |
| +2.023585 | +/- 2.027176 | 2.au.pool.ntp.org | 110.232.114.22 | s2 | no-leap |
Taken 2025-11-09 09:40

^ sync ^ accuracy ^ server ^ ip address ^ stratum ^ leap status ^
| +0.002717 | +/- 0.027207 | 3.debian.pool.ntp.org | <wrap hi>139.99.135.247</wrap> | s2 | no-leap |
| +0.003344 | +/- 0.030205 | 0.debian.pool.ntp.org | 150.107.75.115 | s2 | no-leap |
| +0.187739 | +/- 0.208642 | 1.debian.pool.ntp.org | 203.132.94.154 | s1 | no-leap |
| +2.001419 | +/- 2.038669 | 2.debian.pool.ntp.org | <wrap hi>159.196.3.239</wrap> | s2 | no-leap |
| +0.000044 | +/- 0.024017 | pool.ntp.org | 129.250.35.250 | s2 | no-leap |
| +0.000092 | +/- 0.024373 | au.pool.ntp.org | <wrap hi>112.213.32.219</wrap> | s2 | no-leap |
| +0.023537 | +/- 0.064874 | 0.au.pool.ntp.org | <wrap hi>159.196.3.239</wrap> | s2 | no-leap |
| +0.000697 | +/- 0.021170 | 1.au.pool.ntp.org | 67.219.100.202 | s2 | no-leap |
| +2.002964 | +/- 2.027214 | 2.au.pool.ntp.org | <wrap hi>112.213.32.219</wrap> | s2 | no-leap |
| +0.154351 | +/- 0.184338 | 3.au.pool.ntp.org | 159.196.40.161 | s1 | no-leap |
Taken 2025-11-09 11:15

Based upon the duplication of ip address for different domain names and changing ip addresses on same domain names it looks like the ip address are rolled to different servers to balance load. 

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