You will now need to adjust different parameters in order for your firewall machine to act as a DHCP server for your LAN.
Interface that the DHCP Should Listen to | eth0 |
This field holds the name of the interface connected to the LAN. Only those computers which share the same subnetwork with that address will get a response from the DHCP server.
Client's Domain Name (ex.: company.com) | company.com |
Simply enter your machine's domain name in this field.
WINS Server IP | If you host a Windows domain name server on your LAN, enter its IP in this field. Hence, the DHCP server will tell your network's Windows workstations, when they boot, what the IP of the WINS Server is, instead of having to configure each Windows workstation accordingly. |
Start of the IP Range (ex.: 24) | 65 |
End of the IP Range (ex.: 75) | 254 |
Those fields contain the IP address range allowed for client DHCP hosts. The example given is for a class C subnetwork. Make sure you do not include the first IP (0 in that case) nor the last (255) in the range: they are reserved. Note that the first addresses are generally reserved for static IP hosts, while the last ones are used by DHCP servers.
Default Time Interval (21600 = 6h) | 21600 |
Max Time Interval (43200 = 12h) | 43200 |
The assignment of an IP to a host is always limited in time. When the client does not set the needed leasing period, the server will intervene and reassign an IP to the host every "Default Time Interval" seconds. However, a client's request for a specific leasing period inferior to the "Max Time Interval" will be honored. Otherwise, an IP will be reassigned automatically after that "Max Time Interval" has expired.