On Fri, Jan 27, 2006 at 16:38:02 +0100, Benoit Panizzon wrote: > I have two Stratum 0 Servers connected to a DCF77 Clock and use > several pool servers to sync with. > > During the last few days I noticed my DCF Clocks not being accepted > anymore because of the offset becoming quite large (20ms at the > moment) while all other NTP servers stay within a few ms...
Does your server have an ADSL connection? The asymmetry distorts NTP's network delay calculation. I have seen the same behaviour with my timeserver at home which has an old DCF receiver connected to the serial port. When it's synced to the DCF signal, it reports about 30ms offset to external timeservers. Whenever it lost the DCF signal, it began to drift towards the external servers and back again when its (preferred) refclock came back. That's why I only use the DCF receiver and let the clock run free in times of bad reception (about 5% of the time, according to ntpq). Hauke.
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