From The Navigation Bar On The Left Side, Select - Watchguard Firebox SOHO 6 Wireless User Manual

Chapter 6: Configure the Firewall Settings
2

From the navigation bar on the left side, select

Firewall => Pass Through.
The Unrestricted Pass Through IP Address page opens.
3 Select the Enable pass through address checkbox.
4 Type the IP address of the computer to connect to the pass
through in the applicable field.
This must be a public IP address.
5 Click Submit.
A pass through connection decreases the security of the trusted network,
because the computer with the pass through connection is on the same
Ethernet segment as the trusted network. Do not use a pass through
connection unless the effect of the pass through connection on the security
of the trusted network is known.
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WatchGuard Firebox SOHO 6 Wireless