Chapter 7 Firewall for FortiOS 5.0 : Firewall objects : Example Scenario: Using FortiGate services to support Audio/Visual Conferencing : Creating an address for the subnet
  
Creating an address for the subnet
In the same way that the VIP was created to identify and direct incoming traffic an address should be created to identify the addresses of computer that will be in the Conference room. This included computers on the LAN as well as the Teleconferencing equipment.
Go to Firewall Objects -> Address -> Addresses
Create New
Fill out the fields with the following information:
Category
Address
Name
Port7_subnet
Type
Subnet
Subnet/IP Range
192.168.7.0/255.255.255.0
Interface
port7
Show in address list
checked