[ntp:questions] ntp.conf pool pool.ntp.org preempt (was ntpd 4.2.4p5 pool pool.ntp.org preempt)

E-Mail Sent to this address will be added to the BlackLists Null at BlackList.Griffin-Technologies.invalid
Sun May 31 03:12:16 UTC 2009


 > BlackList wrote:
 >> A few Q, re:ntpd 4.2.4p5 pool pool.ntp.org preempt
 >> It appears that the ntp.conf, pool command isn't yet implemented?
 >>  e.g. pool 1.north-america.pool.ntp.org
 >
 > After a little more research, it seems I should be
 >  checking out at least ntp-dev-4.2.5p86 ?

Now having tried 4.2.5p180 which does support
   pool pool.ntp.org preempt in the ntp.conf (yea!) e.g.

server ntp.vendor.example.com preempt prefer iburst minpoll 5 maxpoll 11
server ntp.hosting.ISP.example.org minpoll 6 maxpoll 11
server ntp1.upstream.ISP.example.net minpoll 6 maxpoll 11
server ntp2.upstream.ISP.example.net minpoll 6 maxpoll 11

pool 0.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14
pool 1.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14
pool 2.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14
pool 3.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14


  Questions come to mind
   re:<http://www.pool.ntp.org/use.html>
 >>> Additional Notes ... If your Internet provider has a timeserver, ...
 >>>   you should use that and not this list.
 >>>
        Done, although the closest 2/3 are off by 40-50ms
          from most of the world (as is their "GPS" ref server).
          {weird}

 >>> Additional Notes ... Be friendly ... don't use more than
 >>>  three time servers in your configuration

         As a query to any one of 0.vendor.pool.ntp.org ,
          country.pool.ntp.org , 0.country.pool.ntp.org ,
           pool.ntp.org , ... currently returns _five_ A records.

        Does this mean only one pool entry should be used (at most)?


  What would a vendor's NTP server(s) ntp conf be expected to be like?

  e.g. ntp.vendor.example.com
peer ntp1.vendor.example.com prefer iburst minpoll 4
peer ntp2.vendor.example.com prefer iburst minpoll 4
pool 1.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14

  e.g. ntp1.vendor.example.com
server 127.127.20.0 prefer
fudge 127.127.20.0 flag3 1
peer ntp.vendor.example.com prefer iburst minpoll 5
peer ntp2.vendor.example.com prefer iburst minpoll 4
pool 2.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14

  e.g. ntp2.vendor.example.com
server 127.127.5.0 prefer
fudge 127.127.5.0 refid CDMA
peer ntp.vendor.example.com prefer iburst minpoll 5
peer ntp1.vendor.example.com prefer iburst minpoll 4
pool 3.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14


  What would be a good default / example
   for a vendor's (client) software or appliances?

server ntp.vendor.example.com preempt prefer iburst minpoll 5 maxpoll 11
pool 0.vendor.pool.ntp.org preempt minpoll 7 maxpoll 14

  With recommendations to change the default,
   when a local NTP server is available?

server ntp.internal.lan prefer
server ntp.vendor.example.com preempt

  or
broadcastclient
server ntp.vendor.example.com preempt

  or
multicastclient ntp.internal.lan
server mc.ntp.vendor.example.com preempt

    {Where ntp.internal.lan is a NTP server on the same network
      as the application or appliance (ntp client).}

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