How to achieve mutual access between computers in different network segments within the LAN

Routers are required to communicate between computers in different network segments within the local area network.

Computers in the same network segment only exchange and forward data without routing and can directly access each other through switches; while computers in different network segments must access each other through a layer 3 network device router, and The router also needs to configure routing protocols or write static routes, otherwise it will still not work. Recommended solution: Private LAN, you can expand the subnet mask, so that different network segments become the same network segment.