Edward T. Mischanko wrote:
> How do I configure NTPD so that only the PPS offset is
> used to figure the clock offset, instead of factoring
> in the surviving back-up servers that have bigger offsets?
> I only want the back-up servers to come into play
> when, or if, the PPS fails.
> ...
> server 127.127.20.0 mode 18 minpoll 3 prefer
> fudge 127.127.20.0 time2 0.374000
> server 127.127.22.0 minpoll 3
> fudge 127.127.22.0 flag2 0 flag3 1
> server 192.168.1.254 iburst minpoll 6 maxpoll 6
> server tick.cerias.purdue.edu iburst minpoll 6 maxpoll 6
> server tock.cerias.purdue.edu iburst minpoll 6 maxpoll 6
> server tack.cerias.purdue.edu iburst minpoll 6 maxpoll 6
> server nist1-chi.ustiming.org iburst minpoll 6 maxpoll 6
> server nist.expertsmi.com iburst minpoll 6 maxpoll 6
> server nist.netservicesgroup.com iburst minpoll 6 maxpoll 6
> server ntp.your.org iburst minpoll 6 maxpoll 6
> server navobs1.wustl.edu iburst minpoll 6 maxpoll 6
> server utcnist2.colorado.edu iburst minpoll 6 maxpoll 6
> server time-a.timefreq.bldrdoc.gov iburst minpoll 6 maxpoll 6
> server ntp1.conectiv.com iburst minpoll 6 maxpoll 6
> server east-pool.ustiming.org iburst minpoll 6 maxpoll 6
That seems like excessive stratum ones (except maybe for testing),
and its unnecessary to lock the minpoll / maxpoll so low,
let ntpd decide how often to poll the offsite servers;
{I can see someone maybe calling your usage perhaps abusive.}
If you are providing a stratum one to _many_ ntp clients,
perhaps pick one, stratum one close to you, and the pool?
... prefer your refclocks
server 192.168.1.254 iburst minpoll 6 maxpoll 6
pool us.pool.ntp.org iburst preempt
server time.slackadelic.com iburst
server tack.cerias.purdue.edu iburst # or Perhaps
# Follow the general
<http://support.ntp.org/bin/view/Servers/RestrictedAccess> restricted access
constraints
# as well as their specific <http://ntp.cerias.purdue.edu/> restricted
access constraints
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