[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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