ZyXEL Communications 2002 Series Guia do Utilizador descarregar pdf (Página 120)

Prestige 650HW ADSL Router User’s Guide

Filter Configuration 8-1

Chapter 8

Filter Configuration

This chapter shows you how to create and apply filters.

8.1 About Filtering

Your Prestige uses filters to decide whether or not 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 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 Ethernet side. Call filtering is used to determine if a packet should

be allowed to trigger a call.

Outgoing packets must undergo data filtering before they encounter call filtering. Call filters are divided

into two groups, the built-in call filters and user-defined call filters. Your Prestige has built-in call filters

that prevent administrative, for example, RIP packets from triggering calls. These filters are always enabled

and not accessible to you. Your Prestige applies the built-in filters first and then the user-defined call filters,

if applicable, as shown next.

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ZyXEL Communications 2002 Series Guia do Utilizador Página 120