ZyXEL Communications 642R Series manual Generic Filter Rule Menu Fields, Tcp/Ip

Prestige 642R Series ADSL Router

8.2.4 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 Prestige 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 Prestige 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 21.6.1 and press [ENTER] to open the Generic Filter Rule Menu, as shown below:

Menu 21.6.1 - Generic Filter Rule

Filter #: 6,1

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.

Figure 8-11 Generic Filter Rule

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

Table 8-6 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 [SPACE BAR] to toggle between both types of rules. Parameters	Generic
	displayed below each type will be different.	Filter Rule/
		TCP/IP
		Filter Rule

Active

Select Yes to turn on the filter rule.

Yes/No

Filter Configuration 8-13