More Results on ZL-RED for fairness enhancement between TCP Reno and Vegas

In this paper, we propose ZL-RED (Zombie Listed RED) algorithm, which ehhances SRED algorithm to provide better fairness among many flows at the router buffer. ZL-RED uses the Zombie List, which is also used by SRED, to detect mis-behaving flows which send packets to the router at higher rate than the other flows, and sets larger packet discarding probability to those flows. We evaluate the effectiveness of ZL-RED by simulation experiments, and show that ZL-RED can improve fairness among TCP Reno connections and TCP Vegas connections, and that it can provide higher performance than SRED, even when the number of accommodated connections is large. Keyword TCP (Transmission Control Protocol), TCP Reno, TCP Vegas, Fairness, RED (Random Early Detection), SRED (Stabilized RED)