The Filter Structure Of The Prestige; Figure 117 Filter Rule Process - ZyXEL Communications ADSL2+ Ethernet/USB Gateway 660RU-Tx Series User Manual

Prestige 660RU-Tx Series User's Guide

Figure 117 Filter Rule Process

Fetch Next
Filter Set
Yes
Next Filter Set
Available?
No
Drop Packet
You can apply up to four filter sets to a particular port to block various types of packets.
Because each filter set can have up to six rules, you can have a maximum of 24 rules active for
a single port.
For incoming packets, your Prestige applies data filters only. Packets are processed depending
on whether a match is found. The following sections describe how to configure filter sets.

22.1.1 The Filter Structure of the Prestige

A filter set consists of one or more filter rules. Usually, you would group related rules, for
example, all the rules for NetBIOS, into a single set and give it a descriptive name. You can
configure up to twelve filter sets with six rules in each set, for a total of 72 filter rules in the
system.
179
Filter Set
Fetch Next
Filter Rule
Yes
Next filter
No Rule
Available?
Check
Next
Rule
Start
Packet
intoFilter
Fetch First
Filter Set
Fetch First
Filter Rule
No
Active?
Yes
Execute
Filter Rule
Forward
Drop
Accept Packet
Chapter 22 Filter Configuration