ZyXEL Communications 782M User Manual

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P782M G.SHDSL Bridge 
Chapter 6 
Filter Set Configuration 
This chapter shows you how to create and apply filters. 
6.1 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 
filters, which are discussed later. 
Data filtering examines 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 Ethernet side. Call filtering is used to determine if a 
packet should be allowed to trigger a call. 
Outgoing packets 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 examle, 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 illustrated in the figure shown next. 
 
 
 
 
 
 
 
 
 
 
 
 
Filter Set Configuration 
 
6-1