[ntp:questions] high precision tracking: trying to understand sudden jumps

Starlight Binnacle starlight.binnacle at gmail.com
Sat Sep 10 19:33:45 UTC 2011

Original author of the post here.  Just stumbled upon this thread (three years on) as Google has assigned it a relatively high rank.

An update is in order.

Discovered not long after posting the question that the Endrun Praecis Cntp device has some sort of bug.  On occasion the 'ntpd' daemon running on it returns an insane reply that smacks the client NTP filter logic upside the head and sends the NTP client skewing off wildly.  Takes several subsequent polls for things to settle back down.  The problem was apparent once a graph of statistics was plotted.

Wrote a short patch that filters out the crazy response packets and this fixes the problem.  Still running perfectly to this day.

If anyone wants the patch just email me at < starlight at binnacle dot cx >..

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