[ntp:questions] Re: Synchronisation lost with swisstime.ethz.ch

Eugen COCA ecoca at eed.usv.ro
Sat Aug 13 14:55:46 UTC 2005


bash-2.05$ ntpq -p swisstime.ethz.ch
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 LOCAL(0)        LOCAL(0)        12 l   58   64  377    0.000    0.000
 0.004
*GENERIC(0)      .GPS.            0 l   45   64  377    0.000  5999.46
 0.113
 PPS(0)          .PPS.            0 l  53m   64    0    0.000    0.000
4000.00
xntp1.ptb.de     .PTB.            1 u   54  256  367   32.254  6002.97
775.801


bash-2.05$ ntptrace swisstime.ethz.ch
swisstime.ee.ethz.ch: stratum 13, offset -6.076413, synch distance
0.02371

We may see the PPS source is unavailable for 53 minutes now, the GPS
time is 6 seconds off, but the time reported by the server is quite
good (about 6 ms off - the time on the server I made the check was
about 20ms off).

At this point I was unable to understand how such an error is possible
and what are the recomended methods to avoid it (for the server
administrator, not at the client side).




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