server SERVER1 server SERVER2 server SERVER3 driftfile /etc/ntp.drift restrict default ignore restrict 127.0.0.1 restrict SERVER1 mask 255.255.255.255 nomodify notrap noquery restrict SERVER2 mask 255.255.255.255 nomodify notrap noquery restrict SERVER3 mask 255.255.255.255 nomodify notrap noquery #restrict LOCAL mask MASK nomodify notrap notrust