“Gateway is also called the gateway and protocol converter. The network interconnection realized above the network layer of the gateway is a complex network interconnection device, which is only used for the interconnection of two networks with different high-level protocols. Gateways can be used for both WAN interconnection and LAN interconnection. Gateway is a kind of computer system or equipment that acts as an important task of conversion. The gateway is a translator between two systems that use different communication protocols, data formats or languages, or even completely different architectures. Unlike a bridge that simply conveys information, the gateway repacks the received information to meet the needs of the destination system. Same layer-application layer. “