During the last decade, the Internet usage has been growing at an enormous rate which has been accompanied by the developments of network applications (e.g., video conference, audio/video streaming, E-learning, E-Commerce and real-time applications) and allows several types of information including data, voice, picture and media streaming. While end-users are demanding very high quality of service (QoS) from their service providers, network undergoes a complex traffic which leads the transmission bottlenecks. Considerable effort has been made to study the characteristics and the behavior of the Internet. Simulation modeling of computer network congestion is a profitable and effective technique which fulfills the requirements to evaluate the performance and QoS of networks. To simulate a single congested link, simulation is run with a single load generator while for a larger simulation with complex traffic, where the nodes are spread across different geographical locations generating distributed artificial loads is indispensable. One solution is to elaborate a load generation system based on master/slave architecture.