Chapter 7 Filter Configuration; About Filtering - ZyXEL Communications Prestige 314 User Manual

7.1

About 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 LAN 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.
Data
Outgoing
Filtering
Packet
Match
Drop
packet
Figure 7-1
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
P314 Broadband Sharing Gateway with 4-Port Switch
This chapter shows you how to create and apply filter(s).
Call Filtering
No No
Built-in
match match
default
Call Filters
Match
Drop packet
if line not up
Or
Send packet
but do not reset
Idle Timer
Outgoing Packet Filtering Process
Chapter 7
Filter Configuration
Active Data
No
User-defined
match
Initiate call
Call Filters
if line not up
(if applicable)
Match
Drop packet
if line not up
Or
Send packet
but do not reset
Idle Timer
Send packet
and reset
Idle Timer
7-1