ZyXEL Communications Prestige 642 - Manual (Page 13)

Prestige 642 ADSL Internet Access Router
8-8 Filter Configuration
Table 8-4 Abbreviations Used If Filter Type Is GEN
Abbreviation Description
Off Offset
Len Length
Refer to the next section for information on configuring the filter rules.
8.2.2 Configuring a Filter Rule
To configure a filter rule, type its number in Menu 21.1 - Filter Rules Summary and press [ENTER] to
open Menu 21.1.1 for the rule.
There are three types of filter rules: TCP/IP, IPX and Generic. Depending on the type of rule, the
parameters below the type will be different. Use the space bar to select the type of rule that you wish to
create in the Filter Type field and press ENTER to open the respective menu.
To speed up filtering, all rules in a filter set must be of the same class, i.e., protocol filters or generic filters.
The class of a filter set is determined by the first rule that you create. When applying the filter sets to a
port, separate menu fields are provided for protocol and device filter sets. If you include a protocol filter set
in a device filters field or vice versa, the Prestige will warn you and will not allow you to save.
8.2.3 TCP/IP Filter Rule
This section shows you how to configure a TCP/IP filter rule. TCP/IP rules allow you to base the rule on
the fields in the IP and the upper layer protocol, e.g., UDP and TCP, headers.
To configure a TCP/IP rules, select TCP/IP Filter Rule from the Filter Type field and press ENTER to open
Menu 21.1.1 - TCP/IP Filter Rule
, as shown below.