NTP status question

[Qinn]

Does anybody know why the NTP status in the dashboard says "Sync Source 45.138.55.60 (stratum 1, .GPS.)" To the best of my knowledge "stratum 1", would mean I have a Cesium clock om my roof, which I am sure is not the case, last time I checked the roof

[elvisimprsntr]

@Qinn

Stratum 0 is a reference clock

Stratum 1 .GPS., means you are syncing to a source which has a reference clock.

Example, I have a GPS reference clock connected to pfSense

https://github.com/elvisimprsntr/pfsense-ntp-gps

[johnpoz]

@Qinn

Stratum 0 refers to the ‘reference’ clock itself—typically an atomic clock, GPS clock, or radio clock.
Stratum 1 refers to any machine that synchronizes its system clock directly with the ‘reference’ clock that resides at Stratum 0. For example, a server that has a GPS unit plugged into one of its serial ports.
Stratum 2 refers to any machine that synchronizes its system clock with the clock on a Stratum 1 server.
Stratum 3 refers to any machine that synchronizes its system clock with the clock on a Stratum 2 server, and so on.

So in the above case, since he has his pfsense directly syncing with a reference clock, it is a 0, but anything syncing off of his pfsense ntp server would list that as a 1..

So for example, I run my own ntp server as well with a gps hat using pps.

If I look on a client using that as its its ntp it lists it as a 1

ntpq> pe
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*ntp.home.arpa   .PPS.            1 u   92  128  377    0.786   +0.321   0.093

But if I look on my ntp server

ntpq> pe
     remote                                   refid      st t when poll reach   delay   offset   jitter
=======================================================================================================
*SHM(1)                                  .PPS.            0 l    3   16  377   0.0000  -0.5164   0.0244
-SHM(0)                                  .GPS.            0 l   43   64  377   0.0000 -159.534   2.2688
+ntp-0.gw.illinois.edu                   128.174.38.133   2 u   12   64  377  11.7514   2.2352   2.1540
+ntp.your.org                            .GPS.            1 u   33   64  377  10.3975   2.5761   1.6993
-tock.usshc.com                          .WAAS.           1 u    -   64  377  15.9844   1.6906   0.4770
-ntp1.netwrx1.com                        127.127.28.0     2 u   13   64  377  37.6681  -5.6588   1.7070
ntpq> 

Notice the SHM sources are listed as 0.

[Qinn]

Thnx guys