Netgear RH348 User Manual download pdf (Page 87)

Reference Guide for the Model RT328 and Model RH348 ISDN Routers

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 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.

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Netgear RH348 User Manual Page 87