Gateway (Gateway) is also known as the Internet connector, protocol converter. The gateway realizes network interconnection above the network layer and is the most complex network interconnection device, and is only used for interconnection of two networks with different high-level protocols. Gateways can be used for both WAN interconnection and LAN interconnection. A gateway is a computer system or device that acts as a switch. Used between two systems with different communication protocols, data formats or languages, or even completely different architectures, a gateway is a translator. Unlike bridges that simply communicate information, gateways repackage the received information to suit the needs of the destination system.
To go from one room to another, one must pass through a door. Similarly, sending information from one network to another must also pass through a "gateway", which is the gateway. As the name suggests, Gateway [1] is the "gateway" that connects one network to another. That is, the network gate.
Gateway (Gateway) is also known as the Internet connector, protocol converter. The default gateway is on the network layer to realize network interconnection, and is the most complex network interconnection device, only used for the interconnection of two networks with different high-level protocols. The structure of the gateway is also similar to that of the router, the difference is the interconnection layer. Gateways can be used for both WAN interconnection and LAN interconnection
Only by setting the IP address of the gateway, the TCP/IP protocol can realize the mutual communication between different networks. The IP address of the gateway is the IP address of the device with routing function. The device with routing function includes a router, a server with routing protocol enabled (essentially equivalent to a router), and a proxy server (also equivalent to a router).