Managing DHCP servers

You can add, update, and delete DHCP servers.

Adding a DHCP server

1. Select DHCP Server from the System dropdown.
2. Select Create to create a new DHCP server.
3. Enter values in the relevant fields. See DHCP server fields.
4. Select Save.

Updating a DHCP server

1. Select DHCP Server from the System dropdown.
2. Select a DHCP server and then select Edit.
3. Update the values that you want to change.
4. Select Save.

Deleting a DHCP server

1. Select DHCP Server from the System dropdown.
2. Select a DHCP server and then select Delete.
3. Select Yes in the confirmation dialog box to delete the selected DHCP server.

DHCP server fields

The Create DHCP Server and Edit DHCP Server dialogs contain the following fields:

Settings	Guidelines
Interface	From the dropdown, select an interface.
DHCP status	Enable/disable DHCP status. Note: By default, the DHCP status is enabled.
IP Range	DHCP IP address range. The IP range of each DHCP server must match the network address range. See Configuring an IP range.
Netmask	Netmask assigned by the DHCP server.
Default Gateway	Select either Same as Interface IP (default) or Specify. When Specify selected, enter the default gateway IP address assigned by the DHCP server.
DNS server	Options for assigning DNS servers to DHCP clients: Same as System DNS—Clients are assigned the configured DNS servers of the firewall. Same as Interface IP —The IP address of the interface the DHCP server is added to becomes the clientʼs DNS server IP address. Specify—Specify up to four DNS servers in the DHCP server configuration (default).
DNS Server1	DNS server 1. Note: This option is only available when the DNS server is Specify.
DNS Server2	DNS server 2. Note: This option is only available when the DNS server is Specify.
DNS Server3	DNS server 3. Note: This option is only available when the DNS server is Specify.
DNS Server4	DNS server 3. Note: This option is only available when the DNS server is Specify.
Lease time	Set the time after which the assigned IP address expires, in seconds. The default is 604800.
IP Address Assignment Rules	Configure IP address assignment rules. See Configuring an IP address assignment rule. Note: This option must be enabled by a system administrator.

Configuring an IP range

To configure an IP range:

1. In IP Range, select + to add a new IP address range.
2. In the IP Range field, enter the IP range.

Configuring an IP address assignment rule

To configure an IP address assignment rule:

1. In IP Address Assignment Rules, click Create or select an existing rule and click Edit.

2. Specify the Type:

   • Mac Address: Assign an IP address based on a device MAC address.

   • DHCP Relay Agent: Assign an AP address based on relay agent information.

3. Configure the following settings:

   Settings	Guidelines
   Match Criteria
   Mac Address	Enter a device MAC address. Note: This option is only available when Type is set to Mac Address.
   Circuit ID	Enter the option 82 circuit ID of the client that will get the reserved IP address. Format: <vlan><mod><port> vlan: VLAN ID (2 bytes) mod: 1 = snoop, 0 = relay (1 byte) port: port number (1 byte) Note: This option is only available when Type is set to DHCP Relay Agent.
   Remote ID	Enter the option 82 remote ID of the client that will get the reserved IP address. Format: the MAC address of the client. Note: This option is only available when Type is set to DHCP Relay Agent.
   Action
   Action Type	Select the action type: Assign IP: Assign an available IP address. Block: Do not assign an IP address. Reserve IP: Assign a specific IP address. Note: This option is only available when Type is set to Mac Address.
   IP	If Action Type is set to Reserve IP or Type is set to DHCP Relay Agent, enter the IP address to assign.

4. Click Save.