Related Topics

Configure an IPv4 DHCP Server

DHCP (Dynamic Host Configuration Protocol) is a method to assign IP addresses automatically to network clients. You can configure your Firebox as a DHCP server for the networks that it protects. If you have a DHCP server, we recommend that you continue to use that server for DHCP.

These DHCP settings apply to trusted, optional, or custom interfaces, and to VLAN, Bridge, and Link Aggregation interfaces in trusted, optional, or custom security zones.

If you Firebox is configured in drop-in mode, the configuration steps are different. To configure DHCP in drop-in mode, see Configure DHCP in Drop-In Mode.

The features available in WatchGuard System Manager (WSM) can be different for different versions of Fireware. If your Firebox does not run Fireware OS v11.10.x or higher, the content in this Help topic might not apply to your Firebox.

For instructions to complete the procedures in this topic for a Firebox that runs an older version of Fireware, see:

Configure IPv4 DHCP in Mixed Routing Mode in WatchGuard System Manager v11.9.4 Help

Configure DHCP for IPv4

Configure DHCP Reservations

You can use DHCP reservations to reserve a specific IP address for a client.

Configure DHCP Options

DHCP options, also known as vendor extensions, enable you to specify DHCP configuration parameters and other control information, as described in RFC 2132. You can add predefined or custom DHCP options. Custom options are supported in Fireware v11.9.3 and higher.

The predefined DHCP options are:

DHCP Option Code Name Type Description
150 TFTP Server IP IP address(es)

The IP address of the TFTP server where the DHCP client can download the boot configuration.

66 TFTP Server Name Text The name of the TFTP server where the DHCP client can download the boot configuration.
67 TFTP Boot Filename Text The name of the boot file.
2 Time Offset 4 byte integer

Time offset in seconds from Coordinated Universal Time (UTC).

43 Vendor specific information Text This option is used by clients and servers to exchange vendor- specific information.
120 SIP Servers IP address(es)

IPv4 addresses of one or more Session Initiation Protocol (SIP) outbound proxy servers. This option is described in RFC 3361.

138 CAPWAP Access Controller IP address(es)

IPv4 addresses of one or more CAPWAP Access controllers. This option is described in RFC 5417.

156 DHCP State 1 byte integer (Unsigned) State of the IP address. This option is used by ShoreTel phones for an FTP boot option.

Some versions of Fireware OS do not support all the predefined options. If the option code you select requires a specific minimum version of Fireware, a notation appears to the right of the selected code in Policy Manager.

You can add a predefined DHCP option or a custom DHCP option. If you use the same DHCP option code for more than one interface, the Type configured for the option code must be the same on each interface.

If the option required by your vendor is not in the list of predefined options, you can add it as a custom option.

DHCP option codes 1, 3, and 28 are not supported.

Configure Per-Interface WINS/DNS

By default, when it is configured as a DHCP server your Firebox gives out the DNS and WINS server information configured on the Network Configuration > WINS/DNS tab. To specify different information for your device to assign when it gives out IP addresses, you can add a DNS server for the interface.

See Also

Configure DHCP Relay

Add WINS and DNS Server Addresses

Configure an IPv6 DHCP Server

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