Asus DSL-X11 - Manual (Page 52)

DSL-X11 User Manual
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Click Add and the page for defining the IP filtering rule appears.
In this page, you can create a filter rule to identify incoming IP traffic by specifying
a new filter name and at least one condition. All specified conditions in the filter
rule must be complied with the rule to take effect. Click Save/Apply to save and
activate the filter.
You must select at least one WAN interface to apply this rule.
Filter Name: Enter the name of incoming filter rule.
Protocol: Select one from TCP/UDP, TCP, UDP, and ICMP protocols.