Chapter 7 Filter Configuration; About Filtering; Figure 7-1 Outgoing Packet Filtering Process - ZyXEL Communications Prestige 310 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 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 PPTP or PPPoE
encapsulation (refer to the Remote Node Setup chapter).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
Filter Configuration
This chapter shows you how to create and apply filter(s).
Call Filtering
No
Built-in
match
match
default
Call Filters
Match
Drop packet
if line not up
Or
Send packet
but do not reset

Figure 7-1 Outgoing Packet Filtering Process

Prestige 310 Broadband Sharing Gateway
Filter Configuration
No
No
User-defined
match
Call Filters
(if applicable)
Match
Drop packet
if line not up
Or
Send packet
but do not reset
Idle Timer Idle Timer
Chapter 7
Active Data
Initiate call
if line not up
Send packet
and reset
Idle Timer
7-1