[ntp:questions] Strange behaviour

Brad Knowles brad at stop.mail-abuse.org
Tue Mar 15 18:06:21 UTC 2005

At 2:05 PM -0300 2005-03-15, Alain wrote:

>  I have started some tests in that efect (to test ntpd sanity) and got
>  very strange results. I restarted the internet connection in order to
>  change my IP (something that can happen unexpectedly) ando now "ntpq -p"
>  is showing duplicate servers!!!

	I don't know anything about your configuration, but if you've 
used the pool.ntp.org servers, note that the same server may be 
placed in multiple lists, and this raises the chance that you may 
accidentally try to connect to the same machine more than once.

	For example, a server might be listed in be.pool.ntp.org, as well 
as europe.pool.ntp.org, as well as [012].europe.pool.ntp.org, as well 
as [012].pool.ntp.org, and the main pool.ntp.org domain itself.  If 
you were to try to use all of these zones as part of your 
configuration, there's a chance that you might try to talk to the 
same server no less than five times, even though that is 
statistically highly unlikely.

	I'm sure there are other sites that also list multiple IP 
addresses for the same name.

Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.

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