## DNS
option domain-name-servers 10.10.10.1;
## broadcast
option subnet-mask 255.255.255.0;
## Lease in sec
default-lease-time 600;
## 
max-lease-time 7200;

## your netowrk

subnet 10.10.10.0 netmask 255.255.255.0 {
     ## MAx 100 here range 100 -200 ip
    range dynamic-bootp 10.10.10.100 10.10.10.200;
    option routers 10.10.10.1;
}