Hi, I have a couple of small machines (Soekris 6501 and 5501) that I use as NTP server in the NTP pool. When I use a sensor as the only source of time (Garmin 18lvc on the serial port or Meinberg PZF180PEX DCF77 receiver card), the offset is quite good: nearly allways below 20 us, most of the time below 5 us and sometimes even less than 1 us. But when I add another server (mainly as backup in case the sensor doen't work), the offset drifts away to 1 or 2 ms. I tried with 1 sensor and 1 server, with 1 sensor and multiple servers, I tried adding weight 5 or 10 to the sensor, but this doesn't seem to have any effect. In all cases ntpd stays synchronised to the sensor (with poll=15s), but after an hour or so after starting ntpd the offset starts to increase. And from that moment, the offset wanders between roughly -2 and +2 ms. It almost seems as if ntpd is synchronised with one of the servers (with much higher polling interval), however ntpctl still shows that it is synchronised to the sensor (albeit with the wandering offset as described above).
I would prefer to have the microsecond offset _and_ some servers as backup, but can't get it working like that. Am I missing something? Or is this a bug in ntpd? Thanks for any help.
