Detection and Control Mechanisms of Tampered-TCP at Edge Routers

In this report, we propose a new mechanism which detects tampered-TCP connections and keeps the fairness among TCP connections at edge routers. The proposed mechanism monitors TCP packets at an edge router and estimates the window size or throughput of each TCP connection. By using estimation results, the proposed mechanism judges whether each connection is tampered or not and drops packets intentionally if necessary to improve the fairness among connections. From the results of simulation experiments, we exhibit that the proposed mechanism can identify tampered-TCP connections at high probability and regulate throughput ratio between tampered-TCP connections and competing TCP Reno connections to around 1.