Configuring A Filter Rule; Tcp/Ip Filter Rule - ZyXEL Communications ZyXEL ZyWALL 50 User Manual

Refer to the next section for information on configuring the filter rules.

15.2.2 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.
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 filter field or vice versa, the ZyWALL will warn you and will not allow you to save.

15.2.3 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 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 next.
Filter Configuration
Table 15-2 Rule Abbreviations Used
ABBREVIATION
DP Destination Port number
GEN
Off Offset
Len Length
ZyWALL 50 Internet Security Gateway
DESCRIPTION
15-7