[ntp:questions] Re: New to NTPD
Richard B. Gilbert
rgilbert88 at comcast.net
Wed May 10 13:51:41 UTC 2006
Ted Gervais wrote:
> On Tue, 9 May 2006, Richard B. Gilbert wrote:
>>> remote refid st t when poll reach delay
>>> offset jitter
>>> mircx.com 22.214.171.124 2 u 23 128 7 70.362
>>> 27.808 7.917
>>> neate.neateroll 126.96.36.199 3 u 24 128 7 80.833
>>> 14.010 6.666
>>> d221-85-115.com 188.8.131.52 2 u 17 128 7 41.316
>>> 25.977 2.463
>> Your reach field shows that only the three most recent polls were
>> successful!!!! This is not good. Did you disconnect the network
>> cable or have a network problem? That is probably why none of the
>> three servers has been selected.
> Yes. Somehow my system rebooted?? I don't know why. But it came back
> up and that was the result.
>> Can you find a fourth server? Four are the minimum required to
>> protect against one falseticker. Five protect against two
>> falsetickers and seven against three. With only three servers, the
>> failure of one leaves you with only two.
> OK on adding another server. Iwill do that right now. And here is what
> things look like now that it has been running for nearly a full day:
> remote refid st t when poll reach delay offset
> +mircx.com 184.108.40.206 2 u 288 1024 375 71.586 -100.04 45.062
> +neate.neateroll 220.127.116.11 3 u 320 1024 377 76.978 -21.913 5.698
> *d221-85-115.com 18.104.22.168 2 u 314 1024 377 42.064 -6.444 3.894
>> It is written that a man with two clocks can never be certain what
>> time it is!!
>> You need to let that system run for a while, perhaps for as long as a
>> full day to reach a stable state with good synchronization.
> Yes. And of course I plan to run it forever without any breaks as I
> have this on my server which runs all the time anyway..
> Ted Gervais
> Coldbrook, Nova Scotia
> Canada. (ve1drg)
It looks as if it's working. I wish I could say it's working well. It
may BE working well but I worry about the large difference of opinion
between mircx.com and d221-85-115.com. I suspect that at least one of
them has a serious problem of some sort. I suppose that Nova Scotia does
not give you a large choice of nearby servers.
ntptime should show you your "maximum error" and "estimated error". If
you are satisfied with those numbers you are done. If not, you might
look into the purchase of a hardware reference clock of some sort. You
can get a GPS timing receiver from Garmin (GPS18-LVC) for about $85 US.
If you get that working you become a stratum 1 server in your own right!
Depending on your hardware and O/S, you could keep your server within a
few microseconds of UTC.
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