Bay Technical Associates RM356 - Manual (Page 83)

Reference Guide for the Model RM356 Modem Router
Filter Configuration 8-7
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 entry 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 entry 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.