An IP firewall consists of: Two or more networks, basic filters for the different networks, and rules for the connections between the networks. In addition, there may be a NAT function that hides the inner network from the outside.
An Ingate Firewall also has various relays.
To handle firewall rules and relays, you need to group machines and networks for each network connected to the firewall. These are defined on the Networks and Computers page.
The network interfaces in Ingate Firewall are Ethernet cards.