(, Build two-layer routing. Use a crossover cable to connect the WAN port of the second router to any LAN port of the first router (assuming they support any pole combination with a straight-through cable), the key is, in the second router WEB settings, as The WAN interface is assigned a static IP and gateway, the IP is in the same subnet as the computer connected to the first router, and the gateway is the internal interface address of the first router. In this way, two layers of routing are built.)