[lug] Time (again) sanity check

Jarrar Jaffari jarrar.jaffari at gmail.com
Wed Jun 25 23:27:52 MDT 2008


unless there is a "*" before the server name or IP address the 'ntpq -p'
does not show that the server is sync'ing with it's source. Also if your
time is too much off from the NTP-server then you might wanna do a quick
(quantam) fix with either ntpdate or "ntpq".

Hope this helps.




On Wed, Jun 25, 2008 at 9:01 PM, David L. Anselmi <anselmi at anselmi.us>
wrote:

> Gary Hodges wrote:
>
>> I had to postpone my search for a WWVB or GPS time solution, but as luck
>> would have it the folks running the time server (the one with incorrect
>> time) said they would fix it.  They now claim it has the correct time, but I
>> can't seem to set my computer time correctly with it.
>>
>
>  hodges at machine:~$ ntpq -p
>>     remote           refid      st t when poll reach   delay   offset
>>  jitter
>> ==============================================================================
>>
>>  mach.nv.doe.go 151.61.251.233   2 u   26   64    5    6.862    0.174
>> 11.644
>>
>
> This tells you that you're synced.  In other words your time is set
> correctly.
>
> Why are you worried about this?  Sure, I'm anal and a minute plus would
> drive me nuts for a machine on the Internet.  But usually I'd care much more
> that all the machines had the same time (for log comparisons and such) than
> that they were all just so.  Of course that should be trivial with ntp.
>
> Want to hear a sea story?  Well, no, I shouldn't tell the whole thing here.
>  Suffice to say that some warships, with a myriad of GPS receivers, don't
> use the GPS signal to sync their computer clocks.  They do have NTP servers
> but only some of them are synced from shore over a radio link.
>
> I was amazed.  Especially when a guy in the radio room told me he had no
> GPS signal there.  So I asked him to walk me through a time sensitive
> procedure and eventually it lead to him looking at a GPS display that showed
> not only time and location, but heading, pitch, and roll.  Wow.
>
> Dave
>
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