Zyxel-communications PRESTIGE 128MH User Manual download pdf (Page 140)

Prestige 128MH PSTN Router/Hub

9-10 Filter Configuration

9.3.2 Generic Filter Rule

This section shows you how to configure a generic filter rule. The purpose of generic rules is to

allow you to filter non-IP/IPX packets. For IP and IPX packets, it is generally easier to use the IP

and IPX rules directly.

For generic rules, the Prestige treats a packet as a byte stream as opposed to an IP or IPX packet.

You specify the portion of the packet to check with the Offset (from 0) and the Length fields, both

in bytes. The Prestige applies the Mask (bit-wise ANDing) to the data portion before comparing

the result against the Value to determine a match. The Mask and Value are specified in

hexadecimal numbers. Note that it takes two hexadecimal digits to represent a byte, so if the

length is 4, the value in either field will take 8 digits, e.g., FFFFFFFF.

To configure a generic rule, select Generic Filter Rule in the Filter Type field and press Enter to

open Menu 21.1.2 - Generic Filter Rule, as shown in Figure 9-5.

Figure 9-5. Menu 21.1.2 - Generic Filter Rule

Menu 21.1.2

Generic Filter Rule

Filter #: 1,1

Filter Type= Generic Filter Rule

Active= No

Offset= 0

Length= 0

Mask= N/A

Value= N/A

More= No Log= None

Action Matched= Check Next Rule

Action Not Matched= Check Next Rule

Press ENTER to Confirm or ESC to Cancel:

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Zyxel-communications PRESTIGE 128MH User Manual Page 140