[ntp:questions] Re: New to NTPD

Ted Gervais ve1drg at av.eastlink.ca
Wed May 10 00:59:06 UTC 2006


On Tue, 9 May 2006, Richard B. Gilbert wrote:


-snip-
>>      remote           refid      st t when poll reach   delay   offset 
>> jitter
>> ============================================================================== 
>> +clock.via.net   .GPS.            1 u  223  256  377  101.718   21.183 
>> 5.465
>>  gnomon.cc.colum .USNO.           1 u  483 1024  301   55.229   26.100 
>> 2.439
>> -NAVOBS1.MIT.EDU .PSC.            1 u   11  256  377   60.820   28.740 
>> 2.602
>> +ntp3.usv.ro     .PPS.            1 u   15  256  377  173.654   26.977 
>> 1.469
>> *clock.xmission. .GPS.            1 u  216  256  377   88.717   23.674 
>> 4.681
>> +c-24-130-58-99. .GPS.            1 u   83  256  377  118.072   23.165 
>> 1.358

> <big snip>
>
> You seem to have very large round trip delays to the servers you have chosen. 
> Shorter delays are better.  The error in transmitting time from server to 
> client is bounded by one half the round trip delay.  With a delay of 173.654 
> milliseconds, all you know is that the error can't be worse than 86.3 
> milliseconds.
>
> Look for servers close to you in net-space; i.e. those with low values for 
> delay.  I look for delays of fewer than twenty milliseconds and have found 
> five servers that meet this test.  If I could not find sufficient servers 
> meeting the twenty millisecond objective, I would relax my standards until I 
> could find five servers.

Alright.  I made some changes to the servers (as you mentioned).. how does 
this look now?  It has only been running 30 mins at this time:
---------
      remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
  mircx.com       129.6.15.29      2 u   23  128    7   70.362   27.808 
7.917
  neate.neateroll 199.212.17.15    3 u   24  128    7   80.833   14.010 
6.666
  d221-85-115.com 132.246.168.9    2 u   17  128    7   41.316   25.977 
2.463
----------------


>
> ntpd has selected a server for synchronization, clock.xmision.  The asterisk 
> preceding the server name indicates that it has been selected.  The offsets 
> are still large but I don't think you had been running very long when you got 
> this output.
>
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>

---
Ted Gervais
Coldbrook, Nova Scotia
Canada. (ve1drg)




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