[ntp:questions] ntp execution starts two processes?

Brian Inglis Brian.Inglis at SystematicSW.Invalid
Fri Mar 18 20:40:59 UTC 2005

On Thu, 17 Mar 2005 12:50:11 -0500 in comp.protocols.time.ntp, "Joshua
Coombs" <jcoombs at gwi.net> wrote:

>>>  server ntp.colby.edu            iburst          maxpoll 12
>>>  server ntp0.jensenresearch.com  iburst          maxpoll 12
>>>  server timeserver.cs.umb.edu    iburst          maxpoll 12
>>>  server nist1-ny.glassey.com     iburst          maxpoll 12
>>>  server time.no-such-agency.net  iburst          maxpoll 12
>> Don't set maxpoll unless you know for sure what it does, why you want it, 
>> what the possible risks are, etc....  Your machine may need a lower 
>> maxpoll in order to detect and deal with your clock drift, and if you 
>> force it this high, you may not be able to keep good time.
>A couple ntp operators requested I keep my total NTP activity below 500 
>polls a day when I was soliciting permission to use public stratum 1 
>sources.  I will be running 6 to 8 NTP servers, at least 3 of which will be 
>Cisco boxen.  On the Ciscos, I can't tweak poll intervals, so they top out 
>at 1024 seconds, or 85 polls a day.  3 of them use up half of my alloted 
>polls, and I'd prefer not to run close to that limit by not limiting the 
>other boxen.  I opted to allow ntpd to use a longer poll interval on the 
>pc's as I'll have 3 boxen (the ciscos) running tighter poll intervals, and 
>all the systems will be peered together.  Hopefully the pcs will eventually 
>be picking up local stratum 0 time sources, justifying longer external 
>checks on some systems even more.
>Observation shows NTP will reign in poll intervals if it isn't confidant, so 
>as long as the box shows on the bench it's clock is stable over time, I'm 
>comfortable with this setup and aware of the risks I'm setting myself up 

Might it not be more useful to just run your Cisco boxes at stratum 3,
synchronized by your stratum 2 PC servers which can then run ntpd
within its design limits; or only access the *limited* public stratum
1 servers from whichever of your stratum 2 PC servers *are* dedicated
to timekeeping. Cisco boxes are not dedicated timekeepers as that is
not their primary function. 

Thanks. Take care, Brian Inglis 	Calgary, Alberta, Canada

Brian.Inglis at CSi.com 	(Brian[dot]Inglis{at}SystematicSW[dot]ab[dot]ca)
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