Netopia D3232 IDSL - Manual (Page 80)

8-80 User’s Reference Guide
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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.
Packets in the Netopia D-Series 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.
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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.
A popup menu displays a list of the filter sets you have created.
Select the one you want to edit.
Type of filter “Source” means “Destination” means
Input filter The remote network The local network
Output filter The local network The remote network
The Netopia D7100
input filter
output filter
LAN WAN
packet
packet
Main
Menu
System
Configuration
Filter
Sets
Display/Change
Filter Set