Справочник Пользователя для ZyXEL Communications prestige 314 plus
Prestige 314 PLUS Broadband Sharing Gateway with 4-Port Switch
7-2
Filter Configuration
Figure 7-1 Outgoing Packet Filtering Process
For incoming packets, your Prestige applies data filters only. Packets are processed depending upon whether
a match is found. The following sections describe how to configure filter sets
a match is found. The following sections describe how to configure filter sets
7.1.1 The Filter Structure of the Prestige
A filter set consists of one or more filter rules. Usually, you would group related rules, e.g., all the rules for
NetBIOS, into a single set and give it a descriptive name. The Prestige allows you to configure up to twelve
filter sets with six rules in each set, for a total of 72 filter rules in the system. You cannot mix device filter
rules and protocol filter rules within the same set. You can apply up to four filter sets to a particular port to
block multiple types of packets. With each filter set having up to six rules, you can have a maximum of 24
rules active for a single port.
NetBIOS, into a single set and give it a descriptive name. The Prestige allows you to configure up to twelve
filter sets with six rules in each set, for a total of 72 filter rules in the system. You cannot mix device filter
rules and protocol filter rules within the same set. You can apply up to four filter sets to a particular port to
block multiple types of packets. With each filter set having up to six rules, you can have a maximum of 24
rules active for a single port.
Three sets of factory default filter rules have been configured in menu 21 to prevent NetBIOS traffic from
triggering calls and to prevent incoming telnetting and FTP connections from the WAN side. A summary of
their filter rules is shown in the figures that follow.
triggering calls and to prevent incoming telnetting and FTP connections from the WAN side. A summary of
their filter rules is shown in the figures that follow.
The following diagram illustrates the logic flow when executing a filter rule.
Data
Outgoing
Packet
Drop
packet
Built-in
default
default
Call Filters
User-defined
Call Filters
(if applicable)
Initiate call
if line not up
Active Data
Send packet
and reset
Idle Timer
Or
Or
Drop packet
if line not up
if line not up
Drop packet
if line not up
if line not up
Send packet
but do not reset
Idle Timer
Send packet
but do not reset
Idle Timer
Match
Match
Match
No
match
No
match
No
match
Call Filtering