ZyXEL Communications ZyXEL ExpWave 240B - Manual (Page 60)

ExpWave 240B Secure Outdoor Ethernet Radio Link
9-6 Filter Setup
Figure 9-5 Executing an IP Filter
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.
Figure 9-6 Menu 21.4.1 - Generic Filter Rule
The following table describes the fields in the Generic Filter Rule Menu.
Table 9-5 Generic Filter Rule Menu Fields
Field Description Option
Filter # 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.
Filter Type Use the space bar to toggle between both types of rules. Parameters
displayed below each type will be different.
Generic Filter
Rule/
TCP/IP
Filter Rule
Active Select Yes to turn on the filter rule. Yes/No
Offset 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. Default = 0
Length 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. Default = 0
Mask Enter the mask (in Hexadecimal) to apply to the data portion before
comparison.
Value Enter the value (in Hexadecimal) to compare with the data portion.
More 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.
Yes / N/A
Log 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
None
Action
Matched
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 Log= None
Action Matched= Check Next Rule
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:
Press Space Bar to Toggle.