ZyXEL P-792H v2 User Guide - Page 348
Configuring a Generic Filter Rule
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Chapter 32 Filter Configuration 32.2.3 Configuring a 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 P-792H v2 treats a packet as a byte stream as opposed to an IP or IPX packet. You specify the portion of the packet to check with the Offset (from 0) and the Length fields, both in bytes. The P-792H v2 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 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 Generic Filter Rule in the Filter Type field in menu 21.1.1.1 and press [ENTER] to open Generic Filter Rule, as shown below. Figure 181 Menu 21.1.1.1: Generic Filter Rule Menu 21.1.1.1 - Generic Filter Rule Filter #: 1,1 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 The following table describes the fields in the Generic Filter Rule menu. Table 129 Menu 21.1.1.1: Generic Filter Rule FIELD DESCRIPTION Filter # This is the filter set, filter rule co-ordinates, in other words 2,3 refers to the second filter set and the third rule of that set. Filter Type Use [SPACE BAR] and then [ENTER] to select a rule type. Parameters displayed below each type will be different. TCP/IP filter rules are used to filter IP packets while generic filter rules allow filtering of non-IP packets. Active Offset Length Options are Generic Filter Rule and TCP/IP Filter Rule. Select Yes to turn on the filter rule or No to turn it off. Enter the starting byte of the data portion in the packet that you wish to compare. The range for this field is from 0 to 255. Enter the byte count of the data portion in the packet that you wish to compare. The range for this field is 0 to 8. 348 P-792H v2 User's Guide