Design And Implementation Of Network Simulation System (NS2) Based On The Cluster System

Network Simulation System constructs a virtual network environment which possesses the characteristics of controllable and repeatable network conditions. This makes it possible to predict the correctness and performance of novel network protocols, services, applications and control algorithms before deploying them to Internet.The NS simulator supports the simulation of a very large number of applications, protocols, network types, network elements and traffic models. We call these "simulator objects". NS is an object oriented simulator, written in C++, with an OTcl interpreter as a fronted. The simulator supports a class hierarchy in C++ (also called the compiled hierarchy), and a similar class hierarchy within the OTcl interpreter (also called the interpreted hierarchy). The two hierarchies are closely related to each other, from the user's perspective, there is a one-to-one correspondence between a class in the interpreted hierarchy and the one in the compiled hierarchy.Speedup and real-time response are two important metrics to evaluate the performance of network simulation. Network Simulation is formerly used in the stand-alone terminal, only allowing single-user access. In order to achieving the high efficiency and high-speed parallel network simulation, we have deployed the Network Simulator on the cluster allowing multi-user access.Cluster is a system which is connected with a group of node computers via high performance network or local area network, which provides high performance, high availability and high scalability. The management of a cluster system is difficult because of its incompact...