Hi,
I have a stratum one server running ntpd [EMAIL PROTECTED] with a Garmin GPS 18
LVC as a refclock. I use the shmpps driver from http://time.qnan.org/ .
Since this driver only provides the PPS signal, I need to have a few other
servers defined in my ntp.conf so that my ntpd knows what time it is.
Here's my concern: the poll interval on those servers is always stuck at the
default minpoll (64sec), even though I have not specified so. I would
rather not poll those servers at such a rapid rate, but ntpd seems to be
doing this on its own, as far as I know.
It's been this way since I set up the server, about two months ago. I
haven't messed with it, as I assume ntpd knows what it's doing. However, my
concern has finally prompted me to ask someone.
Here is my ntp.conf (comments removed):
restrict default kod nopeer nomodify notrap
restrict 127.0.0.1
server 127.127.28.0 minpoll 4 maxpoll 4 prefer
fudge 127.127.28.0 refid PPS flag3 1
server tick.ucla.edu iburst
server clock.via.net iburst
server t1.timegps.net iburst
server bigben.cac.washington.edu iburst
server clepsydra.dec.com iburst
driftfile /var/lib/ntp.drift
logfile /var/log/ntp/ntp.log
statsdir /var/log/ntp/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
keys /etc/ntp/keys
trustedkey 1
requestkey 1
controlkey 1
And here is a 'ntpq -p' and 'ntpq -crv' output:
saturn:# ntpq -p
remote refid st t when poll reach delay offset jitter
=========================================================================
*SHM(0) .PPS. 0 l 14 16 377 0.000 0.000 0.001
-tick.ucla.edu .GPS. 1 u 37 64 377 38.910 2.332 1.286
-clock.via.net .GPS. 1 u 51 64 377 34.722 2.470 3.509
+cpe-76-87-109-2 .GPS. 1 u 44 64 377 53.460 0.611 5.654
-bigben.cac.wash .USNO. 1 u 36 64 377 13.590 2.795 2.597
+clepsydra.dec.c .GPS. 1 u 29 64 377 30.161 1.618 1.432
saturn:# ntpq -crv
assID=0 status=0964 leap_none, sync_telephone, 6 events, event_peer/strat_chg,
version="ntpd [EMAIL PROTECTED] Wed Aug 22 18:27:01 UTC 2007 (1)",
processor="i686", system="Linux/2.6.17-5mdv", leap=00, stratum=1,
precision=-20, rootdelay=0.000, rootdispersion=0.343, peer=22004,
refid=PPS, reftime=cab1a338.1c12986c Fri, Oct 5 2007 23:01:28.109,
poll=4, clock=cab1a33e.4d9c88ab Fri, Oct 5 2007 23:01:34.303, state=4,
offset=0.000, frequency=-22.221, jitter=0.001, noise=0.001,
stability=0.000
Thanks for any help.
Regards,
--
Dennis Hilberg, Jr. timekeeper(at)dennishilberg(dot)com
NTP Server Information: http://saturn.dennishilberg.com/ntp.php
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