Watchguard Firebox SOHO 6 User Manual page 171

3 Select the Enable Optional Network checkbox.
4 Type the IP address and the subnet mask of the optional
interface in the appropriate fields.
Make sure that this network is different from that of the trusted network.
5 To configure the DHCP server, select the Enable DHCP Server
on the Optional Network checkbox.
6 Type the first IP address the DHCP server will hand out to
computers connected to the optional network in the applicable
field.
7 Type the WINS Server Address, DNS Server Address
(including the Secondary DNS Server Address if appropriate),
and DNS Domain Suffix in the applicable fields.
These fields are optional.
User Guide
Using VPNforce to Connect to your Corporate Network
149