Figure 16-2 Filter Rule Process; Filter Set - ZyXEL Communications Prestige 652 User Manual

Prestige 652 ADSL Security Router
Two sets of factory filter rules have been configured in menu 21 to prevent NetBIOS traffic from triggering
calls. A summary of their filter rules is shown in the figures that follow.
The following figure illustrates the logic flow when executing a filter rule.
Fetch Next

Filter Set

Yes
Next Filter Set
Available?
No
Drop Packet
16-2
Filter Set
Fetch Next
Filter Rule
Yes
Next filter
No Rule
Available?
Check
Next
Rule

Figure 16-2 Filter Rule Process

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