Abstract: This study considers the potentially negative impacts of an increasing deployment of non-congestion-controlled best-effort traffic on the internet. These negative impacts range from extreme unfairness against competing TCP traffic to the potential for congestion collapse. To promote the inclusion of end-to-end congestion control in the design of future protocols using best-effort traffic, we argue that router mechanisms are needed to identify and restrict the bandwidth of selected high-bandwidth best-effort flows in times of congestion. The paper discusses several general approaches for identifying those flows suitable for bandwidth regulation. As a result of its strict adherence to end-to-end congestion control, the current Internet suffers from main maladies: congestion collapse from undelivered packets. This has the beneficial effect of preventing congestion collapse from undelivered packets; because an unresponsive flow`s otherwise undeliverable packets never enter the network in the first place. The end-to-end nature of Internet congestion control is an important factor in its scalability and robustness. However, end-to-end congestion control algorithms alone are incapable of preventing the congestion collapse and unfair bandwidth allocations created by applications, which are unresponsive to network congestion. This study propose and investigate a new congestion avoidance mechanism called Network Border Patrol (NBP).