[ntp:hackers] GPS weirdness with ntp-dev-4.2.0a-20050303
Bjorn Gabrielsson
bg at lysator.liu.se
Sun Mar 6 13:45:39 PST 2005
Hi John,
I have seen something like your case. Internet time servers was
prefered over a local Trimble Accutime (Palisade). It looked
_something_ like this.
*ntp1.xx.yy .PPS. 1 u 32 64 377 16.592 -0.489 0.236
..
-GPS_PALISADE(0) .GPS. 0 l 6 16 377 0.000 -0.213 0.002
Using "ntpd 4.2.0a at 1.1190-r" on "Linux/2.4.21-NANO".
Will try to document it properly next time I see it.
br,
Björn
John Pettitt <jpp at cloudview.com> writes:
> I just updated gatekeeper one of my FreeBSD servers from
> ntp-dev-4.2.0a-20050206 to ntp-dev-4.2.0a-20050303 and it's started
> selecting clocks other than the attached GPS.
>
> Its started selecting solar (another box on the same lan daisy chained
> to the same Garmin GPS18) rather than the local GPS. Any ideas on what
> changed between snapshots to make this happen? (there are so many diffs
> it's hard to tell).
>
> gatekeeper# ntpq
> ntpq> pe
> remote refid st t when poll reach delay offset
> jitter
> ==============================================================================
> -GPS_NMEA(0) .GPS. 0 l 9 16 377 0.000 0.010
> 0.002
> *solar.localnet .GPS. 1 u 2 16 377 0.804 0.074
> 0.063
> [other clocks deleted for clarity]
>
> Fragment of the conf:
>
> server 127.127.20.0 mode 2 version 4 prefer minpoll 4
> fudge 127.127.20.0 flag3 1
>
> server solar.localnet iburst minpoll 4 maxpoll 4
> [other clocks deleted]
>
> John
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