[ntp:questions] Stratum goes back to 16 all the time

independence at blinkenlights.se independence at blinkenlights.se
Fri Dec 29 23:12:16 UTC 2006


Hi, I've set up a ntpd on my linux box and at first it worked fine and
got a stratum of 2 after a while. Then, after a couple of minutes, it
got a stratum of 16 again. Now it hops back and forth and doesn't seem
to be very stable at all.
I sat and watched the output from peers in ntpq for a while, and first
everything is fine but after a while all the remote servers get *+- etc
in front of their names, I've tried to read what these mean but I'm
don't really understand.

Here's the output from ntpq peers:
ntpq> peers
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 nissan.ifm.liu. .GPS.            1 u   16   64   17   27.721  -479.06
115.831
 timmy.lysator.l .GPS.            1 u   28   64   17   28.089  -380.49
72.967
 timehost.lysato .GPS.            1 u   40   64   17   28.833  -462.36
111.578
 Time1.Stupi.SE  .PPS.            1 u   23   64   17   24.651  -313.99
115.770
 ntp1.sth.netnod .PPS.            1 u   28   64   17   26.199  -475.23
119.470
 ntp2.gbg.netnod .PPS.            1 u   51   64   17   32.007  -455.40
123.874
ntpq> peers
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 nissan.ifm.liu. .GPS.            1 u   85   64   36   27.721  -479.06
115.831
*timmy.lysator.l .GPS.            1 u   32   64   37   28.089  -380.49
118.008
+timehost.lysato .GPS.            1 u   45   64   37   27.253  -522.91
149.591
-Time1.Stupi.SE  .PPS.            1 u   27   64   37   24.651  -313.99
169.327
+ntp1.sth.netnod .PPS.            1 u   32   64   37   26.199  -475.23
116.326
+ntp2.gbg.netnod .PPS.            1 u   54   64   37   32.007  -455.40
110.364
ntpq> peers
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 nissan.ifm.liu. .GPS.            1 u   99   64   36   27.721  -479.06
115.831
*timmy.lysator.l .GPS.            1 u   45   64   37   28.089  -380.49
118.008
+timehost.lysato .GPS.            1 u   58   64   37   27.253  -522.91
149.591
-Time1.Stupi.SE  .PPS.            1 u   40   64   37   24.651  -313.99
169.327
+ntp1.sth.netnod .PPS.            1 u   45   64   37   26.199  -475.23
116.326
+ntp2.gbg.netnod .PPS.            1 u    2   64   77   31.388  -633.99
250.372
ntpq> peers
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 nissan.ifm.liu. .GPS.            1 u  112   64   36   27.721  -479.06
115.831
*timmy.lysator.l .GPS.            1 u   58   64   37   28.089  -380.49
118.008
+timehost.lysato .GPS.            1 u    8   64   77   27.253  -522.91
141.296
-Time1.Stupi.SE  .PPS.            1 u   53   64   37   24.651  -313.99
169.327
+ntp1.sth.netnod .PPS.            1 u   58   64   37   26.199  -475.23
116.326
+ntp2.gbg.netnod .PPS.            1 u   15   64   77   31.388  -633.99
250.372

Why might does this happen?

ntptrace shows this:
localhost: stratum 16, offset 0.000000, synch distance 0.010290




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