This guide will show you how to enable and configure port forwarding on the D-Link 704P Cable/DSL Residential Gateway.  I assume that you already have the router up and running before you try to open up port forwarding.

To log into your router, fire up your web browser and type in "192.168.0.1".

You should see the following login screen.

Type in the password to the router and click "Login". You'll see the "Device Information" page.

Click on the "Advanced" button at the bottom of the menu.  You'll see this.

If your router doesn't automatically go to the "Virtual Server" page, click on that link at the bottom of the page now.

Here is where you enter the port number you would like to forward.  In our example, we'll open up port 80 and port 25 and forward all requests to these ports to a server located at "192.168.0.40".  Make sure to check the "enable" box.  This is what our screen looks like.

Scroll to the bottom of the screen and click on the "Save" button.

The page will refresh automatically.  Scroll to the bottom of the screen once again and you'll see the message "Saved!  The change doesn't take effective until rebooting!".  Yes, I know it's screwed up grammar.  Hehehe.

Now click on the "Reboot" button.  A dialog box will ask "Reboot right now?".  Click "OK".

As the router restarts you'll see this message:

Then the router will display the Device Information page again.  You can click "Log Out".