13-14 User’s Reference Guide

Input and output filters—source and destination

There are two kinds of filters you can add to a filter set: input and output. Input filters check packets received from the Internet, destined for your network. Output filters check packets transmitted from your network to the Internet.

WAN

packet

input filter

packet

output filter

The Netopia Router

LAN

Packets in the Netopia R5000 Series Router pass through an input filter if they originate in the WAN and through an output filter if they’re being sent out to the WAN.

The process for adding input and output filters is exactly the same. The main difference between the two involves their reference to source and destination. From the perspective of an input filter, your local network is the destination of the packets it checks, and the remote network is their source. From the perspective of an output filter, your local network is the source of the packets, and the remote network is their destination.

Type of filter

Source means

“Destination” means

 

 

 

 

 

 

Input filter

The remote network

The local network

 

 

 

Output filter

The local network

The remote network

 

 

 

Adding filters to a filter set

In this section you’ll learn how to add an input filter to a filter set. Adding an output filter works exactly the same way, providing you keep the different source and destination perspectives in mind.

To add an input filter, navigate to the Display/Change Filter Set screen and select Display/Change Filter Set.

Main

Menu

System

Configuration

Filter Sets

Display/Change

Filter Set

A popup menu displays a list of the filter sets you have created.

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Netopia R5000 manual Input and output filters-source and destination, Netopia Router