Watchguard Firebox SOHO 6.1 User Manual page 26

Chapter 1: Introduction
The SOHO 6 has six Ethernet ports, a reset button, and a power
input located on the rear of the appliance. The following
photograph shows the entire rear view.
OPT port
This Ethernet port corresponds to the Optional interface.
This interface is activated when you purchase the Dual ISP
Port upgrade or VPNforce™ Port Upgrade. For more
information on the Dual ISP Port and VPNforce Port
upgrade , see "Configure OPT Port Upgrades" on page 44.
8 WatchGuard Firebox SOHO 6.1