server 0.pool.ntp.org iburst
  server 1.pool.ntp.org iburst
  server 2.pool.ntp.org iburst
  server 3.pool.ntp.org iburst
  
  # Allow only time queries, at a limited rate, sending KoD when in excess.
  # Allow all local queries (IPv4, IPv6)
  restrict default nomodify nopeer noquery limited kod
  restrict 127.0.0.1
  restrict [::1]