Application of Virtual Firewall in Computer Network Security

Fei Xia, Jian Hu
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Abstract

In order to achieve the purpose of integrating VFW flexibly and improving its efficiency, application of virtual firewall (VFW) in computer network security has been explored. OpenStack-based cloud platform VFW system is analyzed with functional requirements and non-functional requirements, and the functional modules of the VFW are divided. Then, the design of VFW system architecture, application layer and functional modules is carried out. Based on the development of OpenStack cloud platform, the realization process of each functional module is elaborated, and finally, a novel queuing model is used to test the efficiency of the VFW system and the test results are analyzed. The theoretical packet loss rate of VFW system is higher than that of simulation experiment, and the error is larger when the number of VFW deployment is small. The average error between the theoretical and simulation results is 6%, and the final error after adjusting the algorithm is 4%. The optimal deployment scheme obtained by simulation experiment is highly consistent with the theoretical results. The model can successfully simulate the deployment of VFW and quickly get the optimal deployment scheme.
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虚拟防火墙在计算机网络安全中的应用
为了达到灵活集成虚拟防火墙并提高其效率的目的,对虚拟防火墙在计算机网络安全中的应用进行了探索。对基于openstack的云平台虚拟防火墙系统进行了功能需求和非功能需求分析,并对虚拟防火墙的功能模块进行了划分。然后,对虚拟防火墙的系统架构、应用层和功能模块进行了设计。基于OpenStack云平台的开发,阐述了各功能模块的实现过程,最后利用一种新颖的排队模型对VFW系统的效率进行了测试,并对测试结果进行了分析。VFW系统的理论丢包率高于仿真实验的丢包率,且当VFW部署数量较少时,丢包率误差较大。理论与仿真结果的平均误差为6%,算法调整后的最终误差为4%。仿真实验得到的最优部署方案与理论结果高度吻合。该模型能够成功地模拟虚拟防火墙的部署,并快速得到最优的部署方案。
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