[ntp:questions] picking a system peer

David Newman dnewman at networktest.com
Sat Aug 18 00:19:35 UTC 2007


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 8/17/07 5:14 PM, Jason Rabel wrote:
> Your GPS offset is almost a second off... Thus it fails the sanity checks
> and is discarded.
> 
> Which GPS receiver do you have specifically?

It's an HP 58503A.

> 
> http://www.ece.udel.edu/~mills/ntp/html/drivers/driver26.html
> 
> If you have a Z3801A (or similar), did you add the "mode 1" on the server
> config line? And did you follow the suggestions for the proper "fudge"
> factor?

No. What I posted before is the entire ntp.conf.

<clueless newbie question>
Where are the docs you're citing located?
</cnq>

If I stop ntpd and query the GPS receiver over a serial connection it
reports system time that's easily within 1s of another GPS receiver I
have (a consumer-grade Garmin thing) and also for other servers sync'd
to external ntp sources.

thanks

dn



> 
> Jason 
> 
> 
>> Next issue: ntpd consistently does not pick the local GPS receiver as
>> system peer and instead locks in on another server with higher delay and
>> stratum.
> 
> ....
> 
>> The first server is my GPS receiver. The next three are open stratum 1
>> servers. The final two are open stratum 2 servers.
> 
>> After ntpd has run for around 24 hours, ntpq -p looks like this:
> 
>> mail# ntpq -p
>>      remote           refid      st t when poll reach   delay   offset
>> jitter
>>
> ============================================================================
> ==
>> xGPS_HP(0)       .GPS.            0 l   11   64  377    0.000  947.161
>>  3.081
>> +timekeeper.isi. .GPS.            1 u  845 1024  237   61.107   -4.727
>>  7.175
>> +cpe-76-168-23-8 .GPS.            1 u   67 1024  377   34.322   -3.144
>>  1.387
>> *cpe-76-169-239- .GPS.            1 u  103 1024  377   29.793    0.814
>>  3.152
>> - -hydrogen.cert.u 216.218.254.202  2 u   57 1024  377   14.689   -3.012
>>  4.311
>> - -clock-b.develoo 10.0.201.116     2 u 1021 1024  377   18.789   -3.747
>>  0.439
> 
> 

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.3 (Darwin)

iD8DBQFGxjsWyPxGVjntI4IRAvsGAKDenmvwpOGBec16Q4erZnYlMI0wegCePZYo
FBv/8TBqdlmqeHhCU5ZD3/w=
=qDEo
-----END PGP SIGNATURE-----



More information about the questions mailing list