Reference Guide for the Model RT311 and RT314 Internet Access Gateway Routers
10-10 Configuring Filters
Applying a Filter Set
After configuring a filter set in Menu 21, you must specify how the filter will be used. Filters are
applied at the LAN interface in Menu 3.1 or at the WAN interface in Menu 4.1. You must specify
whether the filter is applied to incoming or outgoing packets, and whether filter sets are used alone
or combined. You can apply up to four filter sets to the same port by entering the numbers of the
desired filter sets separated by commas, with no spaces. In the following example, the user
specifies that filter sets 1, 3, and 10 are to be applied to packets entering the router from the LAN:
Incoming Filter Sets = 1,3,10
In cascading filter sets, you may need to modify all but the last set in order to have each set
continue to the next set rather than terminate. In the example above, you may need to modify Sets
1 and 3 so that they continue to Set 10. On the last rule of a standalone filter set, you normally set
“Action if Matched” and “Action if Not Matched” to either “forward”or “drop.” However, if you
cascade the filter set to another filter set, one of these actions must be “Check Next Rule.”
Log 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 “View Error Log” on page 9-4).
Seven options are available:
• None—No packets are logged (default).
• Action Matched—Only packets that match t he 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
If the conditions for the filter rule are not met, you can specify what to do with
thepacket. Three options are available:
• Check Next Rule (default)
•Forward
• Drop
Table10-5. Generic Filter Rule Fields (continued)
Field Description