DSL-2520U ADSL2/2+ Router with USB and Ethernet Ports User Manual Configuring via Web-based Interface Firewall In this menu you can configure the firewall of the router: add rules for IP filtering, define a DMZzone, create virtual servers, configure MAC-filters and the Port Triggering function. IP Filters On the Firewall / IP-filters page, you can create new rules for filtering IP packets and edit or remove existing rules. Figure 37. The Firewall / IP-filters page. To create a new rule, click the Add button. Page 48 of 67