Netopia / Eircom -- Static NAT

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Static NAT

IEQG_026

The Static NAT 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 Static NAT in your Netopia.

Firmware Reference

v7.2 R1 and later -- Netopia 3300 Series

Before You Start

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.
Your Netopia Eircom Gateway home screen will appear. If your router is running the latest Eircom approved firmware, you will see an opening screen similar to the image below on the right. Instructions pertaining to this technote will follow immediately after this introduction.
Routers running firmware prior to version 7.4.2 R2 will have a home screen similar to the image on the left. Click on the caption bar below the screen shot to go directly to those instructions.

v7.2 R1 thru v7.4.2 -- Netopia 3300 Series v7.4.2 R2 and later -- Netopia 3300 Series

Configuration for Static NAT

Click on Custom Services in the left hand menu column.

This brings up the NAT (Games and Other Services) page.
Click on the Static NAT button.

Select the Static NAT IP Address for the specified internal host from the list of available IPs.

Click on Next and confirm the selection.

Restart the Netopia to save the changes.

This completes the configuration of the Netopia for a Static NAT host.

Conclusion

You've now configured your Netopia Gateway for the NAT Default Host.