Zyxel-communications G.SHDSL.bis 4-port Security Gateway P-793H Instrukcja Użytkownika Pobierz pdf (Strona 299)

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P-793H User’s Guide

Chapter 30 Filter Configuration 299

CHAPTER 30

Filter Configuration

This chapter shows you how to create and apply filters.

30.1 Introduction to Filters

Your ZyXEL Device uses filters to decide whether to allow passage of a data packet and/or to

make a call. There are two types of filter applications: data filtering and call filtering. Filters

are subdivided into device and protocol filters, which are discussed later.

Data filtering screens the data to determine if the packet should be allowed to pass. Data filters

are divided into incoming and outgoing filters, depending on the direction of the packet

relative to a port. Data filtering can be applied on either the WAN side or the LAN side. Call

filtering is used to determine if a packet should be allowed to trigger a call. Remote node call

filtering is only applicable when using PPPoE encapsulation. Outgoing packets must undergo

data filtering before they encounter call filtering as shown in the following figure.

Figure 181 Outgoing Packet Filtering Process

For incoming packets, your ZyXEL Device applies data filters only. Packets are processed

depending upon whether a match is found. The following sections describe how to configure

filter sets.

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