Generic Filter Rule; Figure 9-5 Executing An Ip Filter; Figure 9-6 Menu 21.4.1 - Generic Filter Rule; Table 9-5 Generic Filter Rule Menu Fields - ZyXEL Communications ZyXEL ExpWave 240B User Manual

ExpWave 240B Secure Outdoor Ethernet Radio Link

9.3.3 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 ExpWave 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 ExpWave 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, e.g., FFFFFFFF.
To configure a generic rule, select Generic Filter Rule in the Filter Type field in the Menu 21.1.1 and press Enter to
open Generic Filter Rule, as shown below.
Press Space Bar to Toggle.
The following table describes the fields in the Generic Filter Rule Menu.
Field
Filter #
Filter Type
Active
Offset
Length
Mask
Value
More
Log
9-6

Figure 9-5 Executing an IP Filter

Menu 21.1.1 - 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:

Figure 9-6 Menu 21.4.1 - Generic Filter Rule

Table 9-5 Generic Filter Rule Menu Fields

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 the space bar to toggle between both types of rules. Parameters
displayed below each type will be different.
Select Yes to turn on the filter rule.
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) to apply to the data portion before
comparison.
Enter the value (in Hexadecimal) to compare with the data portion.
If yes, a matching packet is passed to the next filter rule before an action is
taken; else the packet is disposed of according to the action fields.
If More is Yes, then Action Matched and Action Not Matched will be N/A.
Select the logging option from the following:
None – No packets will be logged.
Action Matched - Only packets that match the rule parameters will be
logged.
Action Not Matched - Only packets that do not match the rule parameters
Log= None
Option
Generic Filter
Rule/ TCP/IP
Filter Rule
Yes/No
Default = 0
Default = 0
Yes / N/A
None
Action
Matched
Filter Setup