ZyXEL Communications 642R Series manual Filter Configuration, About Filtering

Prestige 642R Series ADSL Router

Chapter 8

Filter Configuration

This chapter shows you how to create and apply filter(s).

8.1About Filtering

Your Prestige uses filters to decide whether 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 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. Remote node call filtering is only applicable when using PPPoE encapsulation. Outgoing packets must undergo data filtering before they encounter call filtering as shown in the following figure.

Outgoing

Packet

Data Filtering

Match

Drop

packet

No

match

	Call Filtering
	No		No	Active Data
Built-in		User-defined
	match		match	Initiate call
default		Call Filters
				if line not up
Call Filters		(if applicable)
				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 8-1 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.

Filter Configuration 8-1