Abstract:In recent years, the large-scale promotion of digitalization in transportation inspections has brought about an increasing demand for network resources and increasing requirements for network security protection. In order to adapt to the ever-expanding digital business, improve the quality of substation digital network, and solve the staged objective problem of the lack of IP address resources in the existing IV area, various technical means emerge in endlessly, each with its own advantages and disadvantages, among which NAT technology is the most common and widely used ;In order to improve the network security performance level and ensure the safe and efficient use of substation network resources, through the research of substation (power supply station) private NAT scenario, design the private NAT scene discovery and control system of substation (power supply station) LAN, substation and The relevant IP address planning of the power supply station is imported into the system, and the system analyzes all NAT scenarios in the network through data flow interception, and finally realizes the classified management of network private NAT scenarios by network administrators. Effectively grasp the number of private NATs in the network and the usage of private IP addresses through technical means, improve the security of the network, and accurately trace the source when a security incident occurs.