D-Link DSL-2640B User Manual page 71

Web Configuration
Click Add, the right page 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 this filter rule must comply with the rule. Click Apply to save
and activate the filter.
You should select at least one WAN interface to apply this rule.
You can select the protocol from the drop-down list.
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D-Link DSL-2640B User Manual