I don't know if this is a copyright violation or not but in 6.0 /etc/ntp.conf references to
server 0.rhel.pool.ntp.org
server 1.rhel.pool.ntp.org
server 2.rhel.pool.ntp.org

while a 5.6 has
server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org

Should I file a bugreport?