Among other things, there are disclosed structures, systems and methods for monitoring and regulating access by consumers to computer network bandwidth, particularly with regard to peer-to-peer file sharing. A router (in certain embodiments, a core router) is programmed with a predetermined number of open or open and active internet protocol (IP) sessions a particular computer is allowed. Requests to open sessions that do not exceed that number are permitted. Requests to open sessions that exceed that number may be rejected, or an offer obtain additional session(s), perhaps with additional payment, may be made.