D-Link DI-713P User Manual page 5

Wireless Broadband Router to expose it to the Internet and ensure
complete Internet application compatibility even if specific ports are not
known.
Unlike proxy server or NAT software that requires the software server
to remain visible on the Internet, no local computers are directly externally
visible when using the Wireless Broadband Router. Also the Wireless
Broadband Router, like broadband, is always on, removing the need to
constantly boot a software server when access is desired from a client.
Integrated DHCP services allow up to 252 users to get their IP address
automatically on boot up from the Wireless Broadband Router. Client
machines require no software, simply set them to accept a dynamically
assigned IP address and reboot. Each time they are powered up the
Wireless Broadband Router will recognize them and set their IP address to
instantly connect them to the LAN
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