Reference Guide for the Model RT311 and RT314 Internet Access Gateway Routers

Configuring Filters 10-9

Generic Filter Rule

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

a generic filter rule for your router. Table10-5 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.

Table10-5. Generic Filter Rule Fields

Field Description
Active 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 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 Specify (in hexadecimal format) the value that the router should logically quali fy 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 Specify (in hexadecimal format ) 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).
Ifthe result from the masked packet matches Value, the packet is considered matched.
More Determine whether to pass the packet through the next filter rule before an action is
taken. There are two options:
•Yes
• No (Default)
If Yes is selected, Action Matched and Action Not Matched will be N/A.