restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1 
restrict -6 ::1
driftfile /var/lib/ntp/drift
server 0.rhel.pool.ntp.org
server 1.rhel.pool.ntp.org
server 2.rhel.pool.ntp.org
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys