tos minclock 3 maxclock 6
server 192.0.2.1 iburst
server 192.0.2.2 iburst
server 192.0.2.3 iburst

restrict    default limited kod nomodify notrap noquery nopeer
restrict -6 default limited kod nomodify notrap noquery nopeer
 
restrict 127.0.0.1
restrict -6 ::1
 
leapfile "/var/db/ntpd.leap-seconds.list"