IP虚拟原型的设计与实现

参照美国劳伦斯国家实验室(LBNL)VINT虚拟网络测试平台的设计思想，从教学的角度提出了IP虚拟原型机的实现方法。按照Rational统一过程，使用可视化的UML建模语言，对系统的需求、分析、设计、实现、测试各阶段进行了详尽的描述，建立了许多网络元素的虚拟原型,IP虚拟原型机没有象VINT等专业化虚拟测试平台一样使用专用的数据格式，而是采用了通用的数据报格式和封装方法。本文还实现了异构网络中数据报分片重组功能，并建立了相应的虚拟原型。最后，我们通过同VINT的实验结果的比较验证了IP虚拟原型机的正确性；并在此基础上，用IP虚拟原型机作实验平台对数据报分片重组的一些结论进行了验证。

The Design and Implementation on IP Virtual Prototype

This article refers to the designing idea of LBNL's Virtual InterNetwork Test bed, and brings forward the implementing methods of IP virtual prototype machine from the teaching point of view. According to the Rational Uniform Process, we particularly describe the needs, analysis, designment, implementation and test of this system in UML,and build many network elements' virtual prototypes. IP virtual prototype machine uses the universal data format and encapsulating method, but doesn't use the special data format like VINT etc. In this article we implement the datagram's fragment and reassembly and build their corresponding prototypes to resolve the problems in heterogeneous network. At last we validate the correctness of the IP virtual prototype machine by comparing the test result with VINT. Then we validate some conclusions of datagram's fragment and reassembly by using our IP virtual prototype machine as the test bed.