[ntp:questions] Windows time question.

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Fri Apr 22 19:02:38 UTC 2011


unruh wrote:
> Richard B. Gilbert wrote:
>> unruh wrote:
>>> Rob wrote:
>>>> Hal Murray wrote:
>>>>>    pool<server-name>
>>>>> will use as many addresses from server-name as it needs.
>>>>> If it doesn't get enough with the first DNS lookup,
>>>>>  it will try again in a minute or so, and keep trying
>>>>>  until it gets enough.
>>>>>
>>>>> The default is to collect 10 servers.
>>>>
>>>> If I were involved in the pool I would call that abuse!
>>>>
>>>> The pool DNS lookup now returns 3 servers, used to be 5.
>>>> When everyone uses 10 servers the load on the pool as a
>>>>  whole is twice what it would need to be, and 3 times
>>>>  what would be the minimum reasonable value.
>>>
>>>> Do the pool managers know that it works that way?
>>>>
> I do have a GPS PPS receiver. But that is not the question.
>  The question is why ntpd would demand a default of 10 pool
>   servers.

It doesn't specifically.
 It is up to maxclock of whatever sources that are designed
  to spin up more.  IIRC manycast did this before pool was
  modified to work more like manycast in that regard.

On some of my NTP servers, I intentionally don't use
 the pool command, rather I use a server *.pool.ntp.org
 line, so that the server can pull manycasts up to maxclock,
 without pulling more pool servers than the number in
 server .conf lines.


> The only reason I could think of is that the developers
>  of ntpd do not trust the pool, and feel that they need
>  that many to get a reasonable expectation of accurate
>  time from the pool.

I guess you didn't think of everything. (Shrug)


FYI, The pool command can also be used with sources other
      than pool.ntp.org   e.g.

pool clock.fmt.he.net iburst preempt            # Hurricane Electric Fremont, CA Pool he.net/adm/ntp.html
pool clock.develooper.com iburst preempt        # develooper Pool support.ntp.org/bin/view/Servers/ClockDevelooperCom (you were already using them)
pool time.bldrdoc.gov iburst preempt minpoll 10 # NIST Pool nist.gov/pml/div688/grp40/its.cfm


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