ZyXEL Communications Prestige 128Plus, User Manual, Page: 151 / 203

Prestige 128+ ISDN Router
Filter Configuration 11-11
11.3.2 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 below.
Figure 11-5 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: