[ntp:questions] PPS only configuration

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Thu Jan 17 22:09:45 UTC 2013

BlackLists wrote:> Edward T. Mischanko wrote:
>> BlackLists  wrote:
>>> Mischanko, Edward T wrote:
>>>> I am reconfiguring my NTP servers to be more community friendly.
>>>> I have found that, pool us.pool.ntp.org iburst preempt,
>>>>  doesn't seem to work as no servers come up to sync to?
>>>>   Any idea why?  I am running ntp-dev-4.2.7p343
>>> restrict source nomodify ?
>> I have no restrictions configured.
> Perhaps you are not waiting long enough?
>  Give it 20 minutes, and see what evolves?
> Like Hal mentioned in another post, I also often use something like:
> ntpq -n -c "lpe" -c "las" -c "rv &0" -c "rv &1" -c "rv &2" -c "rv &3" -c "rv &4" -c "rv &5" -c "rv &6" -c "rv &7" -c "rv &8" -c "rv &9" -c "rv &10" -c "rv &11" -c "rv &12" -c "rv &13" -c "rv &14" -c "rv &15"

I just did a quick test with a windows desktop:

keys "... ntp.keys"
trustedkey 123

restrict source nomodify

tos cohort 1 orphan 11

manycastclient key 123 preempt
multicastclient key 123 preempt

server CORPLAN007 key 123 iburst noselect
server CORPWAN214 key 123 iburst preempt noselect

pool us.pool.ntp.org iburst preempt

Within 15 seconds ntp had mobilized 6 LAN servers,
  and 4 servers from the pool (reach of 0);

 By 7 minutes ntp had mobilized 6 servers from the pool
  (3 with reach of 77, 3 with reach of 37);

 By 10 minutes reach was 377,
  and ntp had already started pruning servers;

 By 15 minutes ntp had pruned the servers back down to 10
  (7 from the pool);

 By 1hr, the poll rate for the pool had climbed from 1min to 4 min.

 By 2hrs, it had not tossed anymore servers,
  nor mobilized anymore from the pool.

 {Why did it reject some of the LAN servers?
   It did so, due to some of them doing testing with precision=-5,
    and using tos orphan 11 floor 4;
   (they're discipline coarse increments are 16.666ms, 1/60th sec)}.

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