Configuring A Filter Set; Figure 32-2 Filter Rule Process - ZyXEL Communications ZyWALL 5 User Manual

ZyWALL 5 Internet Security Appliance
The following figure illustrates the logic flow when executing a filter rule. See also Figure 32-6 for
the logic flow when executing an IP filter.
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 multiple types of packets. With each
filter set having up to six rules, you can have a maximum of 24 rules active for a single port.

32.2 Configuring a Filter Set

The ZyWALL includes filtering for NetBIOS over TCP/IP packets by default. To configure another
filter set, follow the procedure below.
Enter 21 in the main menu to open menu 21.
1.
32-2
Filter Set
Fetch Next
Filter Rule
Yes
Next filter
No Rule
Available?
Check
Next
Rule

Figure 32-2 Filter Rule Process

Start
Packet into
filter
Fetch First
Filter Set
Fetch First
Filter Rule
No Active?
Yes
Execute
Filter Rule
Forward
Drop
Accept Packet
Filter Configuration