Abstract: The OSPF protocol is one of the most widely used and successful interior gateway routing protocols in the Internet.Although there have been lots of investigations on the security of the OSPF protocol,there is still a lack of effective detection methods against the route spoofing attacks,so it is difficult to ensure the security of the OSPF routing in networks.By studying the principle of the double link state advertisements (LSAs) attack on the OSPF protocol,this paper presented three necessary conditions that are used to detect the attack,and proposed a detection method against the double LSAs attack on the OSPF protocol.Then,a corresponding detection middle box and analysis server used to detect attacks and clear up their routing pollution were designed and implemented based on the network function virtualization (NFV) technology.The detection middle box is responsible for capturing relevant OSPF packets from various links,sending the trace records to the analysis server,and receiving instructions from the analysis server to restore the polluted routes.The analysis server invokes the detection algorithm to analyze and process the trace record stream,and an alarm is given and an instruction is sent to the detection middle box to restore the contaminated routes if an attack is detected.The experimental results of the prototype show that the proposed method can detect the OSPF double LSAs attack in both IP networks or NFV networks accurately and efficiently,and the prototype has excellent characteristics such as high cost performance and easy to deploy.

Key words: Detection method, Network function virtualization, Network security, OSPF, Routing protocol attack