/etc/dhcp/dhcpd.conf
default-lease-time 120;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
#-------------------------------
subnet 192.168.30.0 netmask 255.255.255.0 {
range 192.168.30.10 192.168.30.20;
option broadcast-address 192.168.30.255;
}
#-------------------------------
subnet 172.16.0.0 netmask 255.255.255.0 {
range 172.16.0.50 172.16.0.60;
option broadcast-address 172.16.0.255;
}