To use this pool zone, add the following to your ntp.conf file:

   server 0.north-america.pool.ntp.org
   server 1.north-america.pool.ntp.org
   server 2.north-america.pool.ntp.org
   server 3.north-america.pool.ntp.

laptop john # ntpdate server 0.north-america.pool.ntp.org
Error : Name or service not known
14 May 18:32:10 ntpdate[8628]: can't find host server

14 May 18:32:10 ntpdate[8628]: the NTP socket is in use, exiting
laptop ~ # /etc/init.d/ntp-client restartlaptop ~ # ntpq -p server 0.north-america.pool.ntp.org
Name or service not known
***Can't find host server
server                           remote           refid      st t when poll reach   delay   offset  jitter
==========================================================================================================
zoiedog.com                 +ntp2.csl.tjhsst 192.5.41.41      2 u  942 1024  377    4.246    1.262   0.097
zoiedog.com                 *tick.usno.navy. .USNO.           1 u   14 1024  377   10.628   -1.157   0.756
zoiedog.com                 +ntp1.usno.navy. .USNO.           1 u  959 1024  337   10.559   -1.955   0.665
zoiedog.com                  LOCAL(1)        .LOCL.          10 l   12   64  377    0.000    0.000   0.002

laptop ~ # ntpq -p 0.north-america.pool.ntp.org
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+ntp2.csl.tjhsst 192.5.41.41      2 u  979 1024  377    4.246    1.262   0.097
*tick.usno.navy. .USNO.           1 u   51 1024  377   10.628   -1.157   0.756
+ntp1.usno.navy. .USNO.           1 u  996 1024  337   10.559   -1.955   0.665
 LOCAL(1)        .LOCL.          10 l   49   64  377    0.000    0.000   0.002
laptop ~ # 
 * Setting clock via the NTP client 'ntpdate' ...                                                                        [ ok ]
laptop ~ # Error : Name or service not known