Figure 145 Menu 21.1.4.1 Generic Filter Rule; Table 81 Menu 21.1.X.x Generic Filter Rule Menu Fields - ZyXEL Communications P-202H V2 User Manual

For generic rules, the ZyXEL Device 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 ZyXEL Device 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.x.x and press [ENTER] to open Generic Filter Rule, as shown below.

Figure 145 Menu 21.1.4.1 Generic Filter Rule

The following table describes the fields in the Generic Filter Rule menu.

Table 81 Menu 21.1.x.x Generic Filter Rule Menu Fields

FIELD
Filter #
Filter Type
Active
Offset
Length
Mask
Value
Chapter 25 Filter Configuration
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
Action Matched= Check Next Rule
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:
DESCRIPTION
This is the filter set, filter rule co-ordinates, i.e., 2,3 refers to the
second filter set and the third rule of that set.
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.
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.
Enter the mask (in Hexadecimal notation) to apply to the data
portion before comparison.
Enter the value (in Hexadecimal notation) to compare with the data
portion.
P-202H Plus v2 User's Guide
Log= None
OPTIONS
Generic Filter
Rule
TCP/IP Filter
Rule
Yes / No
0-255
0-8
244