Based On The Design And Realization Of The Service Network Architecture, Network Card Software Modules

With the development of broadband communication technology, Especially the maturation of DWDM technology, the bandwidth of the network become more broad and the channel become more reliable. The primary protocol can not meet the tendency very well. Furthermore, as the demand of consumer for network resource become more diversification, it is necessary to meet such demand more perfectly by modifying the network architecture and protocol that has been exited.At the present time, the practical network structures are all layered architecture, and TCP/IP dominates the Internet. TCP/IP was developed for narrowband text transfer. To meet the demand for broadband transfer, TCP/IP is modified unceasingly. At the same time, many research works for network architecture are carried out.This paper first introduces a new type network architecture: the service unit based network architecture (SUNA). It simply analyses the characteristic of SUNA, node-model of SUNA, definition of SU, service that SU provides and so on. Then this paper introduces the Click router system. It mainly expatiates the definition and the components of Click router system. Based on the thought of SUNA and Click router system, we developed SU router. Then this paper discusses SU router, including software truss, CPU scheduling, configure-language, programming environment and so on. In SU router, we define a software object-"package- transact-unit". SU router is consist of these units, whose configuration is stream of packet along transport. In this router, I designed and realized Network Card Software module. It includes FromDevice and ToDevice. So then, this paper mainly dicusses the design and the realization of FromDevice and ToDevice in SU router, including design idea, data structure, function flow, function affect and so on. At last, I provided the testing result of SU router.Based on Object Oriented Programming, I designed Network Card Software module of prototype SU router and coded its function with C++ in linux lernel.