Looks like your 2Wire is configured through a browser.
According to http://www.2wire.com/home/hp_index.html#installation
HomePortal Upgrades are a snap |
Step 1. Using a computer on your HomePortal network open a browser such as Internet Explorer or Netscape.
Step 2. Type //homeportal to view your HomePortal user interface.
Somewhere you should see something to do with port mapping.
I'm way out of my league here--but hopes this helps you get started.