ZyXEL SHDSL Router 791R 91-004-247008B Manual Do Utilizador

Prestige 791R G.SHDSL Router 

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 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 fields 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, 
for example, FFFFFFFF.  

To configure a generic rule select an empty filter set in menu 21, for example 7.  Select Generic Filter 
Rule in the Filter Type field and press [ENTER] to open Menu 21.5.1 

–

 Generic Filter Rule, as shown in 

the following figure. 

Menu 21.7.1 - Generic Filter Rule 

 

Filter #: 7,1 

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: 

 

Press Space Bar to Toggle. 

 

12-14  

 

Filter Configuration