NTP question

Thu May 2 01:17:15 UTC 2019

>If your network is air gapped from the Internet then sure. If it's
>not, you can run NTP against a reasonably reliable set of time
>sources (not random picks from Pool) and be able to say, "my log
>timestamps are accurate to +/- 10 milliseconds so it must be you who
>is farked up." While my milliseconds loses the pecking order contest,
>it's just as good for practical purposes and a whole lot less
>expensive.

You mean something like this, which is relatively easy to achieve:

==============================================================================
offset -0.000009, frequency -0.823, time_const 30, watchdog 238
synchronised to NTP server (192.5.41.40) at stratum 2
   time correct to within 12 ms
   polling server every 1024 s
==============================================================================
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+clock.sjc.he.ne .CDMA.           1 u  287 1024  377   64.313    0.337   0.867
-tock.usnogps.na .IRIG.           1 u    5 1024  377  103.080   -2.097   0.316
-tick.usnogps.na .IRIG.           1 u  806 1024  377  103.053   -2.328   0.363
+india.colorado. .NIST.           1 u  270 1024  377   41.214   -0.159   0.113
+time-b-b.nist.g .NIST.           1 u  984 1024  377   42.609    0.200   0.045
+time-c-b.nist.g .NIST.           1 u  180 1024  377   42.563    0.201   0.064
+time-a-b.nist.g .NIST.           1 u  163 1024  377   42.639    0.137   0.032
*192.5.41.40     .PTP.            1 u  235 1024  377   12.756   -0.388  12.479
-192.5.41.41     .IRIG.           1 u  312 1024  377   13.575   -1.172   2.425
 LOCAL(0)        .LOCL.          10 l    -   64    0    0.000    0.000   0.000
------------------------------------------------------------------------------
pll offset:           -8.474e-06 s
pll frequency:        -0.823 ppm
maximum error:        0.123149 s
estimated error:      0.000122 s
status:               2001  pll nano
pll time constant:    10
precision:            1e-09 s
frequency tolerance:  500 ppm
==============================================================================

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