ZyXEL Communications Prestige 642M series, User Manual

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Prestige 642M Series ADSL Bridge
Filter Configuration 5-1
Chapter 5
Filter Configuration
This chapter shows you how to create and apply filter(s).
5.1 About Filtering
Your Prestige uses filters to decide whether or not to allow passage of a packet. Data filters are divided
into incoming and outgoing filters, depending on the direction of the packet relative to a port. These filters
are further subdivided into device and protocol filters, which are discussed later. The Prestige 642M
ADSL Bridge has device filters only. Device filters are applied to raw packets that appear on the wire.
They are applied at the point when the Prestige is receives and sends packets; i.e. the interface. The
interface can be an Ethernet, or any other hardware port.
The following sections describe how to configure filter sets.
The Filter Structure of the Prestige
A filter set consists of one or more filter rules. Usually, you would group related rules. The Prestige allows
you to configure up to twelve filter sets with six rules in each set, for a total of 72 filter rules in the system.
The following diagram illustrates the logic flow when executing a filter rule.