ZyXEL Communications 1001H manual Filter Structure of the Prestige

P100IH ISDN Router

Outgoing Packet

Data

Filters

Match

Drop

packet

No

match

Call Filters

No

No

Active Data

Built-in

User-defined

default

match

Call Filters

match

Initiate call

if line not up

Call Filters

(if applicable)

Send packet

and reset

Match

Match

Idle Timer

Drop packet

Drop packet

if line not up

if line not up

Or

Or

Send packet

Send packet

but do not reset

but do not reset

Idle Timer

Idle Timer

Figure 9-2 Outgoing Packet Filtering Process

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.

The Filter Structure of the Prestige

A filter set consists of one or more filter rules. Usually, you would group related rules, e.g., all the rules for NetBIOS, into a single set and give it a descriptive name. The Prestige allows you to configure up to twelve filter sets with six rules in each set, for a total of 72 filter rules in the system.

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.

Filter Configuration 9-3