D-Link DI-604 - Manual (Page 29)

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ADVANCED > FILTERS > FIREWALL
Firewall Rules is an advance feature used to deny or allow traffic from
passing through the Broadband Router. It works in the same way as IP
Filters with additional settings. You can create more detailed access rules
for the DI-604. When virtual services are created and enabled, it will also
display in Firewall Rules. Firewall Rules contains all network firewall rules
pertaining to IP (Internet Protocol).
In the Firewall Rules List at the bottom of the screen, the priorities of the
rules are from top (the highest priority) to the bottom (the lowest priority.)
Note: The DI-604 MAC Address filtering rules have
precedence over the Firewall Rules.