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4-34 Administrator’s Handbook
Notes on the example
The
The PAT part of this example setup will allow any user on the Motorola Netopia® Router's LAN with an IP address in the range of 192.168.1.6 through 192.168.1.254 to initiate traffic flow to the outside world (for example, the Internet). No one on the Internet would be able to initiate a conversation with them.
The Static mapping part of this example will allow any of the machines in the range of addresses from 192.168.1.1 through 192.168.1.5 to communicate with the outside world as if they were at the addresses
206.1.1.1through 206.1.1.5, respectively. It also allows any machine on the Internet to access any service (port) on any of these five machines.
You may decide this poses a security risk. You may decide that anyone can have complete access to your FTP server, but not to your Router, and only limited access to the desired services (ports) on the Web and Mail servers.
To make these changes, first limit the range of remapped addresses on the Static Map and then edit the default server list called
•First, navigate to the Show/Change Map List screen, select
•Next, navigate to Show/Change Server List and select
Now, as before, the PAT configuration will allow any user on the Motorola Netopia® Router's LAN with an IP address in the range of 192.168.1.6 through 192.168.1.254 to initiate traffic flow to the Internet. Someone at the FTP server can access the Internet and the Internet can access all services of the FTP machine as if it were at 206.1.1.5. The Router cannot directly communicate with the outside world. The only communication between the Web server and the Internet is through port 80, the Web port, as if the server were located on a machine at IP address 206.1.1.2. Similarly, the only communication with the Mail server is through port 25, the SMTP port, as if it were located at IP address 206.1.1.2