D-Link DI-604 - Manual (Page 21)

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ADVANCED > VIRTUAL SERVER
The DI-604 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 network.
The DI-604 firewall feature filters out unrecognized packets to protect your
LAN network so all computers networked with the DI-604 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-604 redirects the external service request to the
appropriate server within the LAN network.
The DI-604 is also capable of port-redirection meaning incoming traffic to
a particular port may be redirected to a different port on the server
computer.