Chapter 8 Filter Configuration; About Filtering; Figure 8-1 Outgoing Packet Filtering Process - ZyXEL Communications Prestige 645R User Manual

8.1

About Filtering

Your Prestige uses filters to decide whether or not to allow passage of a packet. Data filters are divided into
incoming and outgoing filters, depending on the direction of the packet relative to a port. These filters are
further subdivided into device and protocol filters, which are discussed later. 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
Data
Packet
Filtering
Match
Drop
packet
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 following sections describe how to configure filter sets.
Filter Configuration
This chapter shows you how to create and apply filter(s).
No
Built-in
match
default
Call Filters
Match
Drop packet
if line not up
Or

Figure 8-1 Outgoing Packet Filtering Process

Prestige 645 ADSL Internet Access Router
Filter Configuration
Call Filtering
No
User-defined
match
Call Filters
(if applicable)
Match
Drop packet
if line not up
Or
Send packet Send packet
but do not reset but do not reset
Idle Timer
Chapter 8
Active Data
No
match
Initiate call
if line not up
Send packet
and reset
Idle Timer
Idle Timer
8-1