Looks like your 2Wire is configured through a browser.
According to
http://www.2wire.com/home/hp_index.html#installation Quote:
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.
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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.