Using Dhcp On The Optional Network - Watchguard Firebox X20E User Manual

Configuring the Optional Network
Select the Enable Optional Network check box. If necessary, you can change the optional
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network address. By default, the optional interface IP address is set to 192.168.112.1, so the
trusted network and the optional networks are on two different subnets. The IP address of the
optional network cannot be on the same subnet as the trusted network.
Click Submit.
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Using DHCP on the optional network

The DHCP Server option sets the Firebox X Edge to give IP addresses to the computers on the optional
network. When the Edge receives a DHCP request from a computer on the optional network, it gives
the computer an IP address. By default, the Edge has the DHCP Server option for the optional interface
turned off.
To use DHCP on the optional network:
Use your browser to connect to the System Status page. From the navigation bar, select
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Network > Optional.
The Optional Network Configuration page appears.
Select the Enable DHCP Server on Optional Network check box.
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Type the first available IP address for the optional network. Type the last available IP address.
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The IP addresses must be on the same network as the optional IP address. For example, if your
optional IP address is 192.168.112.1, the IP addresses can be from 192.168.112.2 to
192.168.112.254.
Use the Days/Hours/Minutes value control boxes to set the length of time for each DHCP lease
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the Edge gives.
66 Firebox X Edge e-Series