Like rottydaddy, I have a set of utility pages that come up when I type in the IP of the wired network DSL modem (Actiontek) in my browser's address bar.  Setting up ports and such is right there as one option.

Have you tried calling your ISP tech support?  Just to be certain I had done it all correctly with my DSL modem, I called my provider to check.  They stepped me through what I needed to do on the phone.... no charge.  We confiermed that I had it all set up correctly.

best,

......................john