A network is a group of two or more computer systems linked together. There are many types of computer networks which are categorized based on topology, protocol and architecture. A Mobile Ad hoc NETwork (MANET) is a self-configuring infrastructure less network of mobile devices connected by wireless. Ad hoc networks maintain an unfair behavior in flow control especially when considered in the case of IEEE 802.11 Mac layer. Introducing efficiency in 802.11 is not an easy task. It reduces the overall global throughput. The network is to be designed in such a way that it deals with the fairness and throughput by maximizing aggregate throughput. Such kind of network design can be efficiently implemented on an evolving simulation tool named OMNeT++.