Netgear RT338 참조 가이드
Reference Guide for the Model RT338 ISDN Router
9-8
Configuring Filters
Applying a Filter Set
After configuring a filter set in Menu 21, you must specify where and how the filter is used.
Data filters can be applied either at the LAN interface (in Menu 3.1) or at the Remote Node
interface (Menu 11.5) and can be specified for incoming or outgoing packets. Call filters, which
determine whether or not to place a call to forward the packet, are applied at the Remote Node
interface (Menu 11.5). Up to four filter sets can be applied to the same port by entering the
numbers of the desired filter sets, separated by commas, with no spaces.
Data filters can be applied either at the LAN interface (in Menu 3.1) or at the Remote Node
interface (Menu 11.5) and can be specified for incoming or outgoing packets. Call filters, which
determine whether or not to place a call to forward the packet, are applied at the Remote Node
interface (Menu 11.5). Up to four filter sets can be applied to the same port by entering the
numbers of the desired filter sets, separated by commas, with no spaces.
In the following example, Menu 11.5 - Remote Node Filter Menu, specifies that filter sets 1, 3,
and 10 are used to determine whether a packet causes a call to be placed to the Remote Node.
and 10 are used to determine whether a packet causes a call to be placed to the Remote Node.
Call Filter Sets = 1,3,10
device filters =
Value
In this field, specify (in hexadecimal) the value that the router should use to compare
with the masked packet. The value should align with Offset. Because length is given in
bytes, you need to enter twice the length in hexadecimal numbers for this field.
For example, if length is 4, a valid Value must have 8 hexadecimal numbers
(1155ABF8). If the result from the masked packet matches Value, then the packet is
considered matched.
with the masked packet. The value should align with Offset. Because length is given in
bytes, you need to enter twice the length in hexadecimal numbers for this field.
For example, if length is 4, a valid Value must have 8 hexadecimal numbers
(1155ABF8). If the result from the masked packet matches Value, then the packet is
considered matched.
More
In this field, you can determine whether to pass the packet through the next filter rule
before an action is taken. There are two options for this field:
• Yes
• No (Default)
If Yes is selected for this field, Action Matched and Action Not Matched are N/A.
before an action is taken. There are two options for this field:
• Yes
• No (Default)
If Yes is selected for this field, Action Matched and Action Not Matched are N/A.
Log
In this field, you can determine if you want to log the results of packets attempting to
pass the filter rule. These results are displayed on the System Log (see
pass the filter rule. These results are displayed on the System Log (see
” on
). Seven options are available for this field:
• None—No packets are logged (default).
• Action Matched—Only packets that match the rule parameters are logged.
• Action Not Matched—Only packets that do not match the rule parameters are logged.
• Both—All packets are logged.
• Check Next Rule (default)
• Forward
• Drop
• Action Matched—Only packets that match the rule parameters are logged.
• Action Not Matched—Only packets that do not match the rule parameters are logged.
• Both—All packets are logged.
• Check Next Rule (default)
• Forward
• Drop
Action Matched,
Action Not
Matched
Action Not
Matched
If the conditions for the filter rule are not met, you can specify what to do with
the packet. Three options are available for this field:
• Check Next Rule (default)
• Forward
• Drop
the packet. Three options are available for this field:
• Check Next Rule (default)
• Forward
• Drop
Table 9-5.
Generic Filter Rule Fields (continued)
Field
Description