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Configuring a filter rule, Tcp/ip filter rule, 2 configuring a filter rule – ZyXEL Communications Broadband Security Gateway P-312 User Manual

Page 102: 3 tcp/ip filter rule

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P312 Broadband Security Gateway

Filters

7-7

The protocol dependent filter rules abbreviation are listed as follows:
! If the filter type is IP, the following abbreviations listed in the following table will be used.

Table 7-2

Abbreviations Used If Filter Type Is IP

Abbreviation

Description

Pr

Protocol

SA

Source Address

SP

Source Port number

DA

Destination Address

DP

Destination Port number

! If the filter type is GEN (generic), the following abbreviations listed in the following table will be

used.

Table 7-3

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.

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 Prestige 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 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.