ZyXEL Communications PLA-400 V2 - V3.0.5 Guía de usuario descargar pdf (Pagina 279)

ZyAIR Wireless Gateway Series User’s Guide

Filter and Firewall Configuration 24-11

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.

Figure 24-9 Menu 21.1.4.1 Generic Filter Rule

The 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

second filter set and the third rule of that set.

4,1

Filter Type Press [SPACE BAR] and then [ENTER] to select a type of rule.

Parameters displayed below each type will be different. Choices are

Generic Filter Rule or TCP/IP Filter Rule.

Generic Filter

Rule

Active

Press [SPACE BAR] to select Yes and press [ENTER] to turn on the

filter rule.

(default)

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= No Log= None

Action Matched= Check Next Rule

Action Not Matched= Check Next Rule

Press ENTER to Confirm or ESC to Cancel:

1 2 ... 274 275 276 277 278 279 280 281 282 283 284 ... 395 396

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