[ntp:questions] Re: NTP Stats within norm?

Richard B. Gilbert rgilbert88 at comcast.net
Thu May 25 14:59:36 UTC 2006


Scott L. Glidden wrote:
> Hope you don't mind a top-post...
> 
>      remote           refid      st t when poll reach   delay   offset 
> jitter
> ==============================================================================
> -time.nist.gov   .ACTS.           1 u   87  512   37   70.905   10.262 
> 1.691
> -ntp-nasa.arc.na .GPS.            1 u   94  512  377  102.491   10.018 
> 1.620
> -time-a.nist.gov .ACTS.           1 u  233  512  377   45.727    2.009 
> 4.349
> -time-nw.nist.go .ACTS.           1 u  320  512  377   87.205   13.117 
> 0.393
> -clock.isc.org   .GPSi.           1 u  264  512  377  107.590   14.738 
> 1.249
> *ntp1.twc.weathe .CDMA.           1 u  334  512  377   34.050    5.457 
> 1.018
> -ntp2.twc.weathe .CDMA.           1 u  262  512  377   34.031    6.166 
> 1.212
> -ns1.usg.edu     130.207.244.240  2 u  244  512  377   26.068    7.831 
> 1.776
> +ns2.usg.edu     .GPS.            1 u  346  512  377   31.300    4.523 
> 0.957
>  ns3.usg.edu     65.212.71.102    2 u  255  512  377   26.609    7.583 
> 1.248
> -ns4.usg.edu     130.207.244.240  2 u  233  512  377   31.934    6.318 
> 3.012
> -caesar.cs.wisc. 128.105.201.11   2 u  332  512  377   42.701    8.937 
> 0.746
>  now.cis.okstate .STEP.          16 u  12h 1024    0    0.000    0.000 
> 0.000
> -ntp2.usno.navy. .USNO.           1 u  213  512  377   54.995    2.985 
> 4.446
> +tock.usno.navy. .USNO.           1 u  218  512  377   56.119    4.484 
> 0.885
> -elastic.org     204.152.184.72   2 u  231  512  377  116.555    6.842 
> 0.172
> -216.106.191.180 192.5.41.41      2 u  241  512  377   69.417    7.609 
> 1.177
> -ns1.it2.net     204.123.2.72     2 u  317  512  377   89.060    9.447 
> 1.447
> -opium.apexvoice 138.23.180.126   3 u  333  512  377   89.006    9.750 
> 1.280
> 
> 
>>What does the output of an "ntpq -p" show?
>>
>>David
>>
> 
> 
> 

Lose all the servers with delays greater than 40 milliseconds.  The 
error in transmitting time from server to client is bounded by one half 
the round trip delay; it may be better but it can't get worse than that. 
  Seven servers should be sufficient for the utmost in reliability.  Ten 
is the maximum that ntpd will include in the "selection set"




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