SMC Networks SMC7204BRA manual NAT Rule Add Page RDR Flavor

Adding NAT Rules

The following example illustrates using the RDR rule to provide external access to your web server:

Your ADSL Barricade receives a packet containing a request for access to your Web server. The packet header contains the public address for your LAN as the destination IP address, and a destination port number 80. Because you have set up an RDR rule for incoming packets with destination port 80, the device recognizes the data as a request for Web server access. The device changes the packet's destination address to the private IP address of your Web server and forwards the data packet to it.

Your Web server sends data packets in response. Before the ADSL Barricade forwards them on to the Internet, it changes the source IP address in the data packets from the Web server's private address to your LAN's public address.

To an external Internet user then, it appears as if your Web server uses your public IP address.

Figure 23. NAT Rule - Add Page (RDR Flavor)

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