The NAT Default Host configuration allows your Netopia gateway to send NAT traffic (TCP and UDP protocols) it would otherwise drop to a host on your network. The NAT default host function is useful in situations where you cannot create a specific NAT pinhole for a traffic stream because you cannot anticipate what port number(s) an application might use. For example, some network games select arbitrary port numbers when a connection is being opened. By identifying your computer (or another host on your network) as a NAT default server, you can specify that NAT traffic that would otherwise be discarded by the Netopia should be directed to a specific host.
This technote will guide you through the setup process for the NAT Default Host in your Netopia.
Browse into the Netopia's web interface at http://192.168.1.254 (if using the default IP setting). If your network has a different IP addressing scheme, modify this accordingly.
Once logged in, click on the Expert Mode link in the left-hand side menu (if that link is visible). In the Expert Mode Confirmation screen click on Ok to continue. This menu bar will be visible at the top of your screen if you are in Expert Mode.
Remember to click the button to save any entries. Hitting the back button without clicking will undo any changes.
Once you have completed your configuration, click on the symbol in your upper right hand corner to validate the changes. Then click on Save and Restart.
The Netopia Web GUI Home Page in Expert Mode (Firmware v7.2 and later)
Configuration for NAT Default Host
Click on Configure in the upper Menu bar.
Click on Advanced.
Under the NAT heading, click on the Default Server link to Set up NAT default server options.
"Check" Enable Default Server.
When the Default Server box appears, enter the NAT Server IP Address for the specified internal host to which NAT traffic should be directed.
Click on Submit.
Click on the in the upper right hand corner.
This will validate that the settings are legal for your network.
If you get Validation Passed, click Save and Restart in the menu. If it doesn't validate the change, a message will indicate the reason. It must be corrected before the configuration change can be applied.
This completes the configuration of the Netopia for NAT Default Host.
Conclusion
You've now configured your Netopia Gateway for the NAT Default Host.
button to save any entries. Hitting the back button without clicking 
symbol in your upper right hand corner to validate the changes. Then click on Save and Restart.
