I am still very new to the nptd program so my question should be relatively general. I understand that the program slowly adjusts device's clock rate and syncs to the server time through polling. In the following result, IP address that has a * in the front is the actual time source whereas a + is the backup time source. The backup has a better offset than the actual time source. My question is, in the configuration file, there are 4 servers listed. I wonder which server is the one that the program is syncing with?
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
remote refid st t when poll reach delay offset jitter
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+173.255.215.209 80.72.67.48 3 u 60 64 377 30.713 -0.762 2.808
-64.113.44.55 129.6.15.29 2 u 142 64 274 75.356 3.479 0.970
*144.172.126.201 129.7.1.66 2 u 62 64 375 47.863 2.927 0.418
+108.61.56.35 216.218.254.202 2 u 6 64 377 83.564 1.172 1.423
After some digging, when you run ntpq -pn it will tell you which stratum the device is currently synced to, which is denoted by *.