[ntp:questions] Peering amongst S1

Doug Calvert dfc-list at douglasfcalvert.net
Tue Oct 25 04:00:07 UTC 2011


The docs say no iburst on peers and to use max/min poll of 4. Try 
changing to the suggested settings and see if it works better.

On 10/24/2011 09:31 PM, Miguel Gonçalves wrote:
> Hi!
>
> I am running the following configuration
>
>
> 172.16.0.1 ntp.conf:
>
> server 127.127.20.0 mode 2 prefer minpoll 3 maxpoll 3
> fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 flag4 1
>
> tos mindist 0.250
>
> peer 172.16.0.2 minpoll 3 maxpoll 3 iburst
>
> server ntp-p1.obspm.fr iburst
> server ptbtime1.ptb.de iburst
> server ntp1.oma.be iburst
>
> restrict 127.0.0.1
> restrict default nomodify notrap nopeer
>
> restrict 172.16.0.2 nomodify notrap
>
>
> 172.16.0.2 ntp.conf:
>
> server 127.127.30.0 prefer minpoll 3 maxpoll 3
>
> tos mindist 0.1
>
> peer 172.16.0.1 minpoll 3 maxpoll 3 iburst
>
> server ntp-p1.obspm.fr iburst
> server ptbtime1.ptb.de iburst
> server ntp1.oma.be iburst
>
> restrict 127.0.0.1
> restrict default kod nomodify notrap nopeer
>
> restrict 172.16.0.1 nomodify notrap
>
> Why I am getting 172.16.0.2 as an outlier on 172.16.0.1?
>
> tick# ntpq -p
>       remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> oGPS_NMEA(0)     .GPS.            0 l    3   16  377    0.000   -0.001   0.004
> -172.16.0.2      .GPS.            1 u    5   16  377    0.131    0.002   0.004
> +ntp-p1.obspm.fr .TS-3.           1 u   24   64  377   55.080    2.345   0.881
> -ptbtime1.ptb.de .PTB.            1 u   30   64  377   69.974   -1.179   1.427
> -ntp1.oma.be     .PPS.            1 u   24   64  377   59.191    2.750   1.606
>
> But 172.16.0.1 is OK when used by 172.16.0.2?
>
> tock# /usr/local/sbin/ntpq -p
>       remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> *GPS_ONCORE(0)   .GPS.            0 l    8    8  376    0.000   -0.003   0.004
> +172.16.0.1      .GPS.            1 s    8    8  376    0.132    0.001   0.004
> +ntp-p1.obspm.fr .TS-3.           1 u   45   64  377   52.783    1.075   2.611
> -ptbtime1.ptb.de .PTB.            1 u   54   64  377   69.946   -1.241   0.564
> -ntp1.oma.be     .PPS.            1 u   42   64  377   60.493    3.669   2.034
>
> Both are on the same LAN and running NTP 4.2.7p225.
>
> Any help?
>
> Thanks!
>
> Cheers,
> Miguel
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