ntp.conf pool pool.ntp.org preempt (was ntpd 4.2.4p5 pool pool.ntp.org preempt)

ntp.conf pool pool.ntp.org preempt (was ntpd 4.2.4p5 pool pool.ntp.org preempt)

Post by E-Mail Sen » Mon, 01 Jun 2009 12:12:16



>> 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.yqcomputer.com/ ;
>>> 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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