Matuschka, Sebastian wrote:
Hi,
i'm new here and have a question I couldn't answer by myself by
searching the internet and reading the documentation for hours.
I have a DCF77 Clock connected to the UART. The line in the ntp.conf
looks like this:
server 127.127.8.0 mode 5 prefer
Receiving the time works, but when I disconnect the DCF77-Receiver from
the UART, ntpq -p says that ntpd still synchronizes with it for minutes
(about 4), until it changes to another clock.
I want that the ntpd changes the synchronization source as soon as no
signal is received for a few seconds.
The above is normal behaviour in my experience and I see no reason to
change. My MSF receiver has been mostly online since October apart from
a few MSF outages and power cuts. A few minutes to select a different
source doesn't seem too long, and what source is selected is a matter
for ntpd. Extended power cuts take the server off the internet anyway
and minor glitches from packet loss or other network problems means
that ntpd sets stratum 16 and indicates no server suitable for
synchronisation and servers drop out of pool without giving inaccurate
time. I seem to get very long runs (months) without problem then telco,
isp and electricity supply problems (affecting wide area not just me).
David
How can I achieve this?
The only thing that does something similar, that I can imagine, are the
minpoll maxpoll parameters.
But even then (setting them to 4) it will take up to 16 seconds until
the reference source is changed, correct?
Best Regards
Sebastian
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