Configure an IPv4 DHCP Server

1. Select Network > Interfaces.
2. Select a trusted, optional, or custom interface. Click Edit.
3. From the drop-down list, select DHCP Server.

4. To change the default lease time for addresses in the DHCP address pool, select a different option in the Lease Time drop-down list.
   This is the time interval that a DHCP client can use an IP address that it receives from the DHCP server. When the lease time is about to expire, the client sends data to the DHCP server to get a new lease.
5. To add a group of IP addresses to assign to users on this interface, in the Address Pool section, click Add.
   The Add Address Range dialog box appears.
6. Specify starting and ending IP addresses on the same subnet, then click OK.
   The address pool must belong either to the interface’s primary or secondary IP subnet.
   You can configure a maximum of six address ranges. Address groups are used from first to last. Addresses in each group are assigned by number, from lowest to highest.
   
7. If necessary, configure per-interface WINS/DNS.
8. To configure predefined or custom DHCP options, go to Configure DHCP Options.
9. (Fireware v12.1.1 or higher) By default, the Firebox IP address is the default gateway. To specify a different IP address as the default gateway, select Specify an IP address and type the IP address.

To modify or delete an address pool range:

1. In the Address Pool table select the entry.
2. Click Edit to edit the selected range.
3. Click Remove to remove the selected range.

1. Select Network > Configuration.
2. Select a trusted, optional, or custom interface. Click Configure.
   
3. Select Use DHCP Server.

4. To add a group of IP addresses to assign to users on this interface, in the Address Pool section, click Add.
5. Specify starting and ending IP addresses on the same subnet, then click OK.
   The address pool must belong either to the interface’s primary or secondary IP subnet.
   You can configure a maximum of six address ranges. Address groups are used from first to last. Addresses in each group are assigned by number, from lowest to highest.
6. To change the default lease time for addresses in the DHCP address pool, select a different option in the Leasing Time drop-down list.
   This is the time interval that a DHCP client can use an IP address that it receives from the DHCP server. When the lease time is about to expire, the client sends data to the DHCP server to get a new lease. 
7. If necessary, configure per-interface WINS/DNS.
8. To configure predefined or custom DHCP options, go to Configure DHCP Options.
9. (Fireware v12.1.1 and higher) By default, the Firebox IP address is the default gateway. To specify a different IP address as the default gateway, select Specify and type an IP address.

To modify or delete an address pool range:

1. In the Address Pool table select the entry.
2. Click Edit to edit the selected range.
3. Click Remove to remove the selected range.

To reserve a specific IP address for a client:

1. Select Network > Interfaces.
2. Select an interface and click Edit.
3. In the Reserved Addresses section, type a name for the reservation, the IP address you want to reserve, and the MAC address of the client’s network card.
   The DHCP reservation name cannot start or end with a dot (.) or dash (-), and cannot contain an underscore (_).
4. Click Add.

To modify or delete a reservation:

1. In the Reserved Addresses table, select the reservation.
2. Click Edit to edit the selected reservation.
3. Click Remove to remove the selected reservation.

To reserve a specific IP address for a client:

1. Select Network > Interfaces.
2. Select an interface and click Edit.
3. In the Reserved Addresses section, click Add.
   
4. Type a name for the reservation, the IP address you want to reserve, and the MAC address of the client’s network card.
   The DHCP reservation name cannot start or end with a dot (.) or dash (-), and cannot contain an underscore (_).

5. Click OK.

To modify or delete a reservation:

1. In the Reserved Addresses table, select the reservation.
2. Click Edit to edit the selected reservation.
3. Click Remove to remove the selected reservation.

1. In the DHCP Options list, click Add.
   The Add DHCP Option dialog box appears. Predefined Option is selected by default

2. From the Code drop-down list, select the DHCP option code.
   The Name and Value associated with the code are selected automatically and you cannot edit these.
3. In the Value text box, type the value to assign to this option. It must match the Type for this option. If you specify a double quotation mark, you must preface it with a backslash. For example: ftpservers=\"10.254.252.240,10.255.252.240\",layer2tagging=1,vlanid=252
4. Click OK.

1. Click DHCP Options.
   The DHCP Options dialog box appears.
2. Click Add.
   The Add DHCP Option dialog box appears. Predefined Option is the default selection.

3. From the Code drop-down list, select the DHCP option code.
   The Name and Value associated with the code are selected automatically and you cannot edit these.
4. In the Value text box, type the value to assign to this option. It must match the Type for this option. If you specify a double quotation mark, you must preface it with a backslash. For example: ftpservers=\"10.254.252.240,10.255.252.240\",layer2tagging=1,vlanid=252
5. Click OK.

1. In the DHCP Options list, click Add.
   The Add DHCP Option dialog box appears.

2. Select Custom Option.
3. In the Code text box, type the DHCP option code.
4. In the Name text box, type a name to describe this DHCP option.
5. From the Type drop-down list, select the type of value required by this option.
6. In the Value text box, type the value to assign to this option. It must match the Type you selected. If you specify a double quotation mark, you must preface it with a backslash. For example: ftpservers=\"10.254.252.240,10.255.252.240\",layer2tagging=1,vlanid=252
7. Click OK.

1. Click Add.
   The Add DHCP Option dialog box appears.
2. Select Custom Option.

3. In the Code text box, type the DHCP option code.
4. In the Name text box, type a name to describe this DHCP option.
5. From the Type drop-down list, select the type of value required for this option.
6. In the Value text box, type or select the value to assign to this option. It must match the Type you selected. If you specify a double quotation mark, you must preface it with a backslash. For example: ftpservers=\"10.254.252.240,10.255.252.240\",layer2tagging=1,vlanid=252
7. Click OK.

1. Select Network > Interfaces.
2. Select an interface and click Edit.
3. Select the DNS/WINS tab.
4. To change the default DNS domain, in the Domain Name text box type a domain name.
5. To create a new DNS server entry, in the DNS Server text box, type an IP address, and click Add.
6. To create a new WINS server entry, in the WINS Server text box, type an IP address and click Add.
7. To remove the selected server from a list, click Remove.

1. Select Network > Configuration.
2. Select an interface and click Configure.
3. In the IPv4 tab for an interface, click Configure DNS/WINS servers.
   The Configure DNS/WINS Servers dialog box appears.
4. To change the default DNS domain, type a Domain Name.
5. To create a new DNS or WINS server entry, click Add adjacent to the server type you want, type an IP address, and click OK.
6. To change the IP address of the selected server, click Edit.
7. To remove the selected server from the adjacent list, click Delete.