Reference Guide for the Model RT328 and Model RH348 ISDN Routers

Generic Filter Rule

This section provides information about configuring the protocol-independent parameters for

a generic filter rule for your router. Table 8-5 lists the fields in the menu. When you complete

Menu 21.1.1 - Generic Filter Rule, press [Enter] at the Press ENTER to Confirm... prompt to confirm your selections. Press [Esc] at any time to cancel your selections. The data entered is displayed on Menu 21.1 - Filter Rules Summary.

Table 8-5.

Generic Filter Rule Menu Fields

 

 

 

 

Field

 

Description

 

 

 

 

 

Active

 

In this field, you can make the filter rule active (Yes) or inactive (No).

 

 

 

 

 

Offset

 

Offset refers to the value of the byte that you want to use as your starting offset. That is,

 

 

 

in the data packet, at what point do you want to begin the comparison. The range for

 

 

 

this field is from 0 to 255. Default = 0.

 

 

 

 

 

Length

 

This field refers to the length (in bytes) of the data in the packet that the router should

 

 

 

use for comparison and masking. The starting point of this data is determined by Offset.

 

 

 

The range for this field is 0 to 8. Default = 0.

 

 

 

 

 

Mask

 

In this field, specify (in hexadecimal) the value that the router should logically qualify

 

 

 

and the data in the packet. Because length is given in bytes, enter a hexadecimal

 

 

 

number that is twice the specified length for numbers in this field. For example, if length

 

 

 

is 4, a valid Mask must have 8 hexadecimal numbers (1155ABF8).

 

 

 

 

 

Value

 

In this field, specify (in hexadecimal) the value that the router should use to compare

 

 

 

with the masked packet. The value should align with Offset. Because length is given in

 

 

 

bytes, you need to enter twice the length in hexadecimal numbers for this field. For

 

 

 

example, if length is 4, a valid Value must have 8 hexadecimal numbers (1155ABF8).

 

 

 

If the result from the masked packet matches Value, then the packet is considered

 

 

 

matched.

 

 

 

 

 

More

 

In this field, you can determine whether to pass the packet through the next filter rule

 

 

 

before an action is taken. There are two options for this field:

 

 

 

• Yes

 

 

 

• No (Default)

 

 

 

If Yes is selected for this field, Action Matched and Action Not Matched will be N/A.

 

 

 

 

 

Filter Configuration

8-7