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Refer to the next section for information on configuring the filter rules.
7.2.2 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.
7.2.3 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.
Press Space Bar to Toggle.
Filters
ABBREVIATION
GEN
Off
Len
Menu 21.1.1.1 - TCP/IP Filter Rule
Filter #: 1,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 6
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 137
Port # Comp= Equal
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #=
Port # Comp= None
TCP Estab= No
More= No
Action Matched= Drop
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:
Figure 7-9 Menu 21.1.1.1 — TCP/IP Filter Rule
ZyWALL 10 Internet Security Gateway
DESCRIPTION
Offset
Length
IP Source Route= No
Log= None
7-7
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