Web Manager for Administrators > Configuration>Network>Firewall Configuration > Firewall Configuration: Input Interface, Output Interface, and Fragments

Firewall Configuration: Input Interface, Output Interface, and Fragments
If an interface (such as eth0 or eth1) is entered in the “Input Interface” field, incoming packets are filtered for the specified interface. If an interface is entered in the “Output Interface” field, outgoing packets are filtered for the specified interface. The input and output interface fields are shown in the following figure along with the options on the “Fragments” pull-down menu.
Firewall Configuration “Add Rule” and “Edit Rule” Input and Output Interface Fields and Fragments Menu Options
The following table defines the fields in the above figure.
 
The input interface (ethN) for the packet
The output interface (ethN) for the packet

Web Manager for Administrators > Configuration>Network>Firewall Configuration > Firewall Configuration: Input Interface, Output Interface, and Fragments