Using Dhcp On The Optional Network - Watchguard Firebox X15 User Manual

Changing Your Network Settings
To change the IP address of the optional network:
1
To connect to the System Status page, type https:// in the
browser address bar, followed by the IP address of the Edge
trusted interface.
The default URL is: https://192.168.111.1
2
From the navigation bar, select Network > Optional.
The Optional Network Configuration page appears.
3 Type the first address of the new network address range in the
IP Address text field.
4
If necessary, type the new subnet mask.
5 Click Submit.

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 Firebox
receives a DHCP request from a computer on the optional network,
74 WatchGuard Firebox X Edge