D-Link DI-774 - Manual (Page 21)

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Advanced > Virtual Server
Using the Configuration Menu (continued)
The DI-774 can be configured as a virtual server so that remote users accessing Web
or FTP services via the public IP Address can be automatically redirected to local
servers in the LAN (Local Area Network).
The DI-774 firewall feature filters out unrecognized packets to protect your LAN
network so all computers networked with the DI-774 are invisible to the outside world.
If you wish, you can make some of the LAN computers accessible from the Internet
by enabling Virtual Server. Depending on the requested service, the DI-774 redirects
the external service request to the appropriate server within the LAN network.