Generic Filter Rule - ZyXEL Communications Prestige 202 User Manual

Prestige 202 ISDN Router

9.3.3 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 packets. For IP, it is generally easier to use the IP 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: It takes two hexadecimal digits to represent a byte, so if the length is 4, the
To configure a generic rule, select Generic Filter Rule in the Filter Type field and press [Enter]
to open Menu 21.3.1
Press Space Bar to Toggle.
The next table describes the fields in the Generic Filter Rule menu.
9-12
value in either field will take 8 digits, e.g., FFFFFFFF.
Generic Filter Rule, as shown in the following figure.
–
Menu 21.3.1 - Generic Filter Rule
Filter #: 3,1
Filter Type= Generic Filter Rule
Active= No
Offset= 0
Length= 0
Mask= N/A
Value= N/A
More= No
Action Matched= Check Next Rule
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:
Figure 9-9 Menu 21.3.1
Log= None
Generic Filter Rule
–
Filter Configuration