| The main goal of this thesis is to investigate flow estimation based approach for better QoS support in the Internet. In this context, we present four major topics studied in this thesis. First, we propose a flow estimation scheme, called Hash-based Two-level Caching (HaTCh), to accurately estimate the number of active connections. Second, we investigate the design issues of drop functions in an AQM scheme and propose a new AQM scheme, called HaTCh based RED (HRED), based on the flow estimation technique. Third, we propose a HaTCh-based Dynamic Quarantine (HaDQ) scheme, an extension of the HaTCh scheme, to detect and penalize bandwidth attack without using extra resources. Then, the HaDQ scheme is further extended to dynamically detect and block worm propagation. Finally, we extend our AQM framework to wireless networks. Here, we present a new concept of AQM scheme called Proxy-RED for Wireless Local Area Networks (WLAN). |
