D-Link DI-304M manual NAT Setup

DI-304/DI-304M ISDN Remote Router

NAT Setup

Usually you will use the router as a NAT-enabled router. NAT stands for Network Address Translation. It means the router gets one (in Single ISP, PPPoE, PPTP) or two (in Dual ISPs mode) globally re-routable IP addresses from the ISP. Local hosts will use private network IP addresses defined by RFC-1918 to communicate with the router. The router translates the private network addresses to a globally routable IP address that is then used to access the Internet. The following explains NAT features for specific applications.

Click NAT Setup to open the setup page. On the page you will see the private IP address definitions defined in RFC-1918. Usually we use the 192.168.1.0/24 subnet for the router.

Configure Port Redirection Table

Exposing Internal Servers to the Public Domain

The Port Redirection Table may be used to expose internal servers to the public domain or to directly assign a specific port number to internal hosts. External hosts or domain can specify port numbers to access internal network services, such as FTP, WWW, etc.

The following example shows how an internal FTP server is exposed to the public domain. The internal FTP server is running on the local host addressed as 192.168.1.10.

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