Quick Reference Guide

Reference Guide for the Model RT311 and RT314 Internet Access Gateway Routers
Configuring Filters 7-9
Generic Filter Rule
This section provides information about configuring the protocol-independent parameters for
a generic filter rule for your router. Table 7-5 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 7-5. 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 startin
g
offset. That is,
in the data packet, at what point do you want to be
g
in the comparison. The ran
g
e for
this field is from 0 to 255. Default = 0.
Len
g
th The len
g
th, in bytes, of the data in the packet that the router should use for comparison
and maskin
g
. The startin
g
point of this data is determined by Offset. The ran
g
e for this
field is 0 to 8. Default = 0.
Mask Specify (in hexadecimal format) the value that the router should lo
g
ically qualify and the
data in the packet. Because len
g
th is
g
iven in bytes, enter a hexadecimal number that
is twice the specified len
g
th for numbers in this field. For example, if len
g
th 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 ali
g
n with Offset. Because len
g
th is
g
iven in
bytes, you need to enter twice the len
g
th in hexadecimal numbers for this field. For
example, if len
g
th is 4, a valid value must have 8 hexadecimal numbers (1155ABF8).
If the result from the masked packet matches Value, the packet is considered matched.
More Determine whether to pass the packet throu
g
h 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.