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SAVSH: IP source address validation for SDN hybrid networks

Current Internet packet forwarding only relies on destination IP address and thus neglects the validation of packet's IP source address for Internet accountability, which incurs many cyber-security threats. State-of-the-art solutions either have issues in spoofing packet filtering accuracy, e.g., false positive and false negative, or encounter scalability and deployment problems, i.e., end-host TCP/IP stack or router modification. In this article, we propose SAVSH, a practical IP source address validation scheme for Software Defined Networking (SDN) hybrid networks. SAVSH takes advantage of the SDN architecture which possesses global topological view and central control pattern, so that it can locate nodes for the SDN switch replacement and deploy filtering rules onto them with desirable IP prefix-level filtering accuracy. In the meantime, SAVSH also takes network dynamics (e.g., topology changes) into account. Finally, the established prototype experiment and typical topology simulations demonstrate SAVSH not only possesses desirable performance, but also owns the capability that trades the maximal validation effect with the minimal SDN switch deployment cost, which is up to more than 90% prefix coverage benefit to 15% deployment cost on average.