ZyXEL Communications 128MH user manual The Filter Structure of the Prestige

Prestige 128MH PSTN Router/Hub

Outgoing

Packet

Data	No
	match
Filters
Match
Drop
packet

Call Filters

	No			No	Active Data
Built-in		User-defined
	match			match		Initiate call
default		Call Filters
Call Filters		(if applicable)			if line not up
							Send packet
							and reset
Match			Match				Idle Timer
Drop packet		Drop packet
if line not up		if line not up
Or			Or
	Send packet			Send packet
	but do not reset			but do not reset
	Idle Timer			Idle Timer

Figure 9-1. 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.

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 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.

9-2 Filter Configuration