This paper presents an overview of random early detection algorithm and differentiated services on ns2. In the present scenario of computer networks the traffic is increasing exponentially due to which packet losses are also increasing at a great rate. An active queue management in routers and gateways can potentially reduce packet loss rates in the Internet In this paper we have proposed use of an active queue management algorithm, a modified form of RED algorithm, called MRED (Multi RED) which is an effective way to reduce packet loss rates in the internet. MRED computes the packet drop probability based on our heuristic method rather than the simple method used in RED and enables bandwidth allocation over a single link to different types of traffics. Using simulation, MRED can be shown to perform better than existing queue management schemes. This paper also introduces implementation of DiffServ (Differentiated service) and MRED on ns2 simulator thus depicting advantages of QoS (Quality of Service) to improve network congestion.
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