authoritative;

ddns-update-style interim;
ignore client-updates;

subnet 172.16.0.0 netmask 255.255.0.0 {

    option routers 172.16.1.254;	# specify unused address here to prevent
					# clients from accessing Internet
    get-lease-hostnames true;		# get hostnames from NIS or /etc/hosts
    range 172.16.1.100 172.16.1.150;	# (extend range for more machines)

    default-lease-time 21600;
    max-lease-time 43200;

}