Application of Virtual Firewall in Computer Network Security

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.