Stratum one autonomy and assumptions about GPS
Eric S. Raymond
esr at thyrsus.com
Thu Aug 25 19:37:32 UTC 2016
Achim Gratz <Stromeko at nexgo.de>:
> Forget about GPS outages. If you want to connect these time servers to
> the net, they should have some form of sanity checking that's
> independent from their primary time source and take them off the net as
> soon as something looks fishy.
What kind of sanity checking do you recommend?
> I frequently see .GPS. falsetickers in
> NTPpool (actually the last month I haven't seen them, so maybe they've
> been kicked out) that are/were 50ms and more out, which tells me they
> have either not bothered to determine the fudge factors or run without
> PPS. You don't want to see that kind of stratum-1 clock on a larger
My recipe/HOWTO does emphasize that you need 1PPS for Stratum 1 service.
Beyond that I don't know there's much I can do to head off operator error.
How do you fudge a 1PPS source? What do you have that you consider
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
More information about the devel