Quote Originally Posted by Chris View Post
Both. The modem allows external access to the router then the router allows access to an internal IP/port.
Quote Originally Posted by psilos View Post
Further to Chris's comment, most "modems" issued by ISPs are actually all in one devices (modem and router) and referred to as a Gateway.

My modem must be wide open then. Cause I only forward ports on my router and they all work.

My modem is separate.