Denial of Service (DoS) attacks has become a major problem to intranet and Internet services. DoS attacks can be detected and eliminated using existing efficient Active Queue Management (AQM) schemes like RED. A new kind of DoS attacks have become more common in today’s Transmission Control Protocol (TCP) services, i.e., Low rate Denial of Service (LDoS) attacks. LDoS attacks will degrade the performance of web traffic, TCP services and reduce TCP throughput to zero. There are number of AQM algorithms existing to counter LDoS attacks but their performance and efficiency vary from one algorithm to another.