SDN網(wǎng)絡(luò)虛擬化安全服務(wù)動(dòng)態(tài)構(gòu)建技術(shù)研究
[Abstract]:SDN (Software Defined Network, software defined network is a new network architecture which can not meet the current network requirements because of the inflexibility of the traditional network architecture. It separates the control surface and the data surface of the network equipment. This architecture makes SDN not only face traditional network security threats, The programmability of the security threat caused by centralization of control surface and the virtualization of network function make the security of SDN network be protected by virtualization security service. This paper mainly studies how to construct SDN network virtualization security service dynamically, so as to protect SDN security. The main work of this thesis is as follows: (1) in order to solve the security threats faced by SDN, this paper analyzes the security requirements of SDN, and proposes a new architecture of SDN security service composition. That is to add a security service orchestration center in the SDN control layer, detach the security protection task of SDN from the controller, and hand it over to the security service orchestration center. (2) in order to realize the SDN security service composition architecture, This paper refines the security service orchestration center, decomposes the security service to construct the security metafuncture library. Based on the technology of WEB service composition, an algorithm for dynamic construction of SDN security service is proposed. In this algorithm, two service composition methods are used: workflow-based composition and expert system-based rule composition to meet the needs of different users. (3) aiming at the slow composition time of the rule composition method in the dynamic construction algorithm of SDN security services, An optimization algorithm for dynamic construction of SDN security services based on RETE is proposed. The rules in the rule composition are compiled into RETE network. By saving the intermediate state and the shared state node, the rule composition time is reduced, the user waiting time is reduced, and the user experience is improved. This paper builds the SDN security service network environment on the OpenStack cloud platform, constructs the SDN security service to carry on the function verification to the system. Test the time of the two combinations under different user size, and discuss the reasons that affect the combination of rules. The test results show that the optimized algorithm can reduce the combination time of rules, improve the efficiency of rule combination, and achieve the purpose of SDN security protection in function and performance.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TP393.09
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