Zyxel-communications P-334W Manual do Utilizador descarregar pdf (Página 358)

100

101

Prestige 334W User’s Guide

30-2 Filter Configuration

Figure 30-1 Outgoing Packet Filtering Process

For incoming packets, your Prestige applies data filters only. Packets are processed depending upon whether

a match is found. The following sections describe how to configure filter sets.

30.1.1

The Filter Structure of the Prestige

A filter set consists of one or more filter rules. Usually, you would group related rules, e.g., all the rules for

NetBIOS, into a single set and give it a descriptive name. 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. You cannot

mix device filter

rules and protocol filter rules within the same set. You can apply up to four filter sets to a particular port to

block multiple types of packets. With each filter set having up to six rules, you can have a maximum of 24

rules active for a single port.

Sets of factory default filter rules have been configured in menu 21 to prevent NetBIOS traffic from

triggering calls and to prevent incoming telnet sessions. 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. See also Figure 30-7 for the logic

flow when executing an IP filter.

Data

Filtering

Outgoing

Packet

Drop

packet

Built-in

default

Call Filters

User-defined

Call Filters

(if applicable)

Initiate call

if line not up

Active Data

Send packet

and reset

Idle Timer

Or Or

Drop packet

if line not up

Drop packet

if line not up

Send packet

but do not reset

Idle Timer

Send packet

but do not reset

Idle Timer

Match MatchMatch

match

Call Filtering

1 2 ... 353 354 355 356 357 358 359 360 361 362 363 ... 495 496

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