ZyXEL Communications Wireless Gateway Series 24.3.2 Generic Filter Rule, Mask, Mask, Menu, Value, Offset, Length, Filter Type, Generic Filter Rule, Generic Filter Rule

ZyAIR Wireless Gateway Series User’s Guide

24.3.2 Generic Filter Rule

This section shows you how to configure a generic filter rule. The purpose of generic rules is to allow you to filter non-IP packets. For IP, it is generally easier to use the IP rules directly.

For generic rules, the ZyAIR treats a packet as a byte stream as opposed to an IP packet. You specify the portion of the packet to check with the Offset (from 0) and the Length fields, both in bytes. The ZyAIR applies the Mask (bit-wise ANDing) to the data portion before comparing the result against the Value to determine a match. The Mask and Value fields are specified in hexadecimal numbers. Note that it takes two hexadecimal digits to represent a byte, so if the length is 4, the value in either field will take 8 digits, for example, FFFFFFFF.

To configure a generic rule select an empty filter set in menu 21.1, for example 4. Select Generic Filter Rule in the Filter Type field and press [ENTER] to open Menu 21.1.4.1 – Generic Filter Rule, as shown in the following figure.

Menu 21.1.4.1 - Generic Filter Rule

Filter #: 4,1

Filter Type= Generic Filter Rule

Active= No

Offset= 0

Length= 0

Mask= N/A

Value= N/A

More= NoLog= None

Action Matched= Check Next Rule

Action Not Matched= Check Next Rule

Press ENTER to Confirm or ESC to Cancel:

Figure 24-9 Menu 21.1.4.1 Generic Filter RuleThe next table describes the fields in the Generic Filter Rule menu.Table 24-4 Menu 21.1.4.1 Generic Filter Rule

FIELD	DESCRIPTION	EXAMPLE
Filter #	This is the filter set, filter rule coordinates, for instance, 2, 3 refers to the	4,1
	second filter set and the third rule of that set.
Filter Type	Press [SPACE BAR] and then [ENTER] to select a type of rule.	Generic Filter
	Parameters displayed below each type will be different. Choices are	Rule
	Generic Filter Rule or TCP/IP Filter Rule.
Active	Press [SPACE BAR] to select Yes and press [ENTER] to turn on the	No
	filter rule.	(default)

Filter and Firewall Configuration 24-11