The Research On The Key Technic Of The Simulatin And Software Realization In Network Protocol

With the rapid development and new emerging of Internet technology, great change have brought to the study ,life, recreation of humans.in particular, it has a Profound influence to educational fields when the computer network enters it. It has lasting achievements of the modernization of education ideas, context,and teaching methods.To realize the communications among different hosts in internet,the network protocols that the standards of information transmission and management in internet are need.The study of "the simulation of network protocols " is intended to: (1) research the transmission process and essence of the network protocol from the the bottom layer.(2) promote the reform of the existing university network experiment teaching methods and the improvement of the network experiment teaching system.This have changed the teaching mode ,which the student only to learn and understand the network knowledge through the teacher's unilateral explanation in the past.The data transmited in the internet can be clearly visible,the edition of network protocol can be simple and quick.So the student have vivid and direct view and unstanding of the abstract knowledge of computer network, tru??mproving their network konwledge both in theory and in practice,cultivating their ability of analyzing and solving a problem,training their designing ability . In the long run ,It aroused student's study enthusiasm fully. With a practical topics of application,this paper discusses the design and the realization of the soft simulation of the network protocol of WinPcap.This paper first explains the frame of the Ethernet and TCP/IP network system,some familiar format of the datagram in the computer network and Development function based on the WINPCAP. In this foundation, demand analysis is implemented in the soft simulation in the realization of network protocol, LibPcap and WinPcap are compared. The paper discusses emphatically on the key technic in the simulation of the realization of the network protocol, such as the capture, analysis of datagram packet based on WinPcap, the analysis and selection of the Socket, the man-machine interaction in the simulation of the network protocol. At last, with the analysis of the characteristics of the network protocol simulation, the network protocol simulation model was designed, the network protocol frame editor is included which is the most important part of the network protocol simulation and the implementation of this model was tried to achieve.