[ntp:questions] Meinberg NTP Software--Time Accuracy

W. eWatson notvalid2 at sbcglobal.net
Tue Jun 23 04:29:37 UTC 2009


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> W. eWatson wrote:
> 
>> # Use specific NTP servers
>> server tick.usno.nav.mil iburst
>>
>>
>> I would guess that possible server locations can be found
>>  in a list like <http://support.microsoft.com/kb/262680>,
> 
> You might be better off using <http://www.pool.ntp.org/en/use.html>
> 
> e.g.
>  server 0.us.pool.ntp.org preempt iburst
>  server 1.us.pool.ntp.org preempt iburst
>  server 2.us.pool.ntp.org preempt iburst
>  server 3.us.pool.ntp.org preempt iburst
> 
> If you have at least at least ntp-dev-4.2.5p86
>  e.g. Message-ID: <0fd7b5c0-3f34-4dc7-8d2c-fce10cf4a430 at h28g2000yqd.googlegroups.com>
>   <http://davehart.net/ntp/win/x86/ntp-4.2.5p180-win-x86-bin.zip>
> 
>   you can use the pool commands. e.g.
> 
>  pool 0.us.pool.ntp.org preempt iburst
>  pool 1.us.pool.ntp.org preempt iburst
>  pool 2.us.pool.ntp.org preempt iburst
>  pool 3.us.pool.ntp.org preempt iburst
> 
> 
>>  which shows NIST servers, and Level One Servers.
>>   The site refers to other lists, one from the Naval Obs.
>>  I would think I need to choose several either around the
>>   west coast or around North America to add to the config
>>   file above.
>>  Do I need to include iburst or some other parameter?
> 
> Some of those are only supposed to be used with permission,
>  by Strat 1 or 2 servers.
> 
> e.g. <http://tycho.usno.navy.mil/ntp.html>
> All of the following stratum 1 NTP servers are open to
>   stratum 2 servers within the same time zone and to others
>   by arrangement.
>  Individual users should consult the  public list of stratum
>   2 servers.
> 
> #  tick.usno.navy.mil
> Location: Time Service Dept., U.S. Naval Observatory,
>  Washington, DC
> Synchronization: NTP V4 primary (USNO Master Clock H-masers)
> Access Policy: open access for MIL, GOV, and other stratum
>  2 servers. Choose only one of tick/tock/ntp2.usno.navy.mil.
> 
I set drift.conf as above for Win2000.

   server 0.us.pool.ntp.org preempt iburst

but do not believe the PC clock is in synch with accurate time. After 30-60 
seconds they looked 3 sec apart.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39° 15' 7" N, 121° 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>




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