> 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).} -- E-Mail Sent to this address <[email protected]> will be added to the BlackLists. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
