Start by opening a web browser and type http://homeportal/ to access the AT&T home page. Click on the settings tab and choose the broadband link.
Look for IP address under internet details. If it begins with “10. x.x.x,” you should use the AT&T forwarding tool to smoothly modify port assignments and automatically configure your modem. If your IP address starts with other digits, then you can continue by manually configuring the modem.
Choose firewall and tap to link for applications.
Tap to radio button to allow individual applications under edit firewall settings.
Choose to add new user-defined applications. If your applications were not displayed in the list.
Lastly, enter the port range for forwarding. Tap to save to apply changes.