What is a gateway

  gateway （Gateway） Also called protocol converter , It is a complex network connection device , Can support conversion between different protocols , Realize interconnection between different protocol networks . Gateway has the ability to transform incompatible high-level protocols , In order to realize the communication between heterogeneous devices , The gateway needs to support different link layers 、 Private session layer 、 Translation and transformation of presentation layer and application layer protocols .

So , Gateway is an intelligent router , A super intelligent bridge , An intelligent repeater .​

To make two completely different networks （ Heterogeneous network ） come together , Gateway is generally used , stay Internet The two networks in the network should also be interconnected through a computer called gateway . This computer can communicate with the target computer according to the user IP Address , Decide whether to send the information sent by the user out of the local network , meanwhile , It also receives the information sent by the outside world to the computer belonging to the local network , It is a channel connecting one network to another . In order to make TCP/IP Protocol addressable , The channel is given a IP Address , This IP The address is called the gateway address .

Gateway is mainly used for the connection between network or LAN with different architecture and host system . In interconnected devices , It's the most complicated , Generally, only one-to-one conversion can be performed , Or the transformation of a few specific application protocols . Gateway is generally a kind of software product . at present , Gateway has become a common tool for every user on the network to access mainframe .