Three minutes to take you to understand the terminal access technology

Today I will tell you about terminal access technology. Terminal access refers to the connection of terminal devices and routers, and the completion of data communication between terminal devices and other terminal devices through routers.

There are two types of terminal access implemented by routers: the terminal access initiator and the terminal access receiver.

The terminal access initiator is the party that initiates the TCP connection request. As the client of the TCP connection, it is generally a router;

The terminal access receiver is the party that responds to the TCP connection request. As a TCP connection server, it can be a front-end machine or a router.

Whether the router is the initiator or the receiver, as long as the TCP connection is established, the data stream on the terminal device can be transparently transmitted to the opposite end of the TCP connection.

There are generally five types of terminal access:

TTY terminal access: The initiator is a router and the receiver is a front-end machine. The service terminal is connected to the router through an asynchronous serial port. The router is connected to the front-end computer through the network. The application services run on the front-end computer. The front-end computer interacts with the router through the ttyd program and pushes the business screen to the service terminal through the router. The router is responsible for the transparent transmission of data between its connected service terminals and front-end machines.

Telnet terminal access: The service terminal is connected to the router (Telnet Client) through an asynchronous serial port. The router is connected to the front-end machine (Telnet Server) through the network. The application services run on the front-end machine. The front-end machine interacts with the router through the standard Telnet method. Then establish a data channel between the terminal and the front-end machine.

ETelnet terminal access: The service terminal is connected to the router (ETelnet Client) through an asynchronous serial port. The router is connected to the front-end machine (ETelnet Server) through the network. The application services run on the front-end machine. The front-end machine communicates with the router through a specific encrypted Telnet method. Interaction, and then establish a data channel between the terminal and the front-end machine.

SSH terminal access: The business terminal is connected to the router (secure shell) through an asynchronous serial port. The router is connected to the front-end machine (SSHServer) through the network. Application services run on the front-end machine. The front-end machine interacts with the router through standard SSH, and then Establish a data channel between the terminal and the front-end machine.

RTC terminal access: The initiator of the RTC is a router, and the receiver is also a router. RTC terminal access is another typical application of terminal access. It establishes a connection between a local terminal device and a remote terminal device through a router, completes data interaction, and implements data monitoring functions.

In asynchronous RTC mode (RTC currently only supports asynchronous mode), the monitoring terminal in the data center and the remote monitored terminal are connected to the router through an asynchronous serial port, and the routers exchange data through the IP network.

Generally speaking, the router connected to the monitoring device acts as the initiator (RTC Client). The monitoring device can initiate the connection at any time to obtain the data of the monitored device. The router connected to the monitored device acts as the receiver (RTC Server), and receives the connection request of the monitored device at any time to send the monitored data.

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