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Prestige 2602R Series User’s Guide

Chapter 27 Filter Configuration 200

CHAPTER 27

Filter Configuration

27.1 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.

Figure 126 Outgoing Packet Filtering Process

Data

Filtering

Outgoi ng

Pack et

Drop

pack et

Built-in

def aul t

Call Filters

User-defi ned

Call Filters

(if applicable)

Initiate call

i f line not u

ctive Dat

Send packet

and reset

Idle Timer

Or Or

Drop packe

i f line not u

Drop packe

i f li ne not u

Send packet

but do not reset

Idle Timer

Send packet

but do not reset

Idle Timer

Mat c h Mat c hMat ch

mat c h

mat ch

Call Filtering

Two sets of factory filter rules have been configured in menu 21 to prevent NetBIOS traffic

from triggering calls. A summary of their filter rules is shown in the figures that follow.

The following figure illustrates the logic flow when executing a filter rule.

1 2 ... 195 196 197 198 199 200 201 202 203 204 205 ... 348 349

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