Improvement of Emulation Function in Network Simulator

Network emulate technology which enables real hosts and a real network to interact with a virtual network, becomes a very important way to resolve the challenge faced in network plan, application and protocol design.As a famous network simulator, NS2 proposed a foundation to construct network emulate platform.The emulation function of NS2 was described firstly.Based on analysis the problem of emulation function in NS2, the extension of NS2 emulation function was proposed and implemented.The correctness of extension was dominated in the end.