What are the Linux remote management protocols?

Linux remote management protocols include: 1. RDP protocol (Remote Desktop Protocol), which is an extension of the international standard multi-channel conference protocol "T.120" issued by the International Telecommunications Union; 2. RFB protocol (Graphical Remote Management Protocol) is a simple protocol for remote access to the graphical user interface; 3. Telnet Protocol (Command Line Interface Remote Management Protocol) provides users with the ability to complete remote host work on the local computer; 4. SSH protocol (command line interface remote management protocol).

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

When it comes to remote management, it usually refers to the remote management server, not the personal computer. Personal computers can be used at any time. Servers are usually placed in computer rooms. Users cannot directly access the server hardware and can only use remote management.

Remote management is actually the process of data transmission (information exchange) between computers (servers) through the network. Just like the browser requires the HTTP protocol (Hypertext Transfer Protocol) to browse the web, remote management also requires Remote management protocol support.

Currently, there are four commonly used remote management protocols:

• RDP (remote desktop protocol) protocol: Remote desktop protocol, most Windows systems support this by default protocol, on which remote desktop management in Windows systems is based. This protocol is an extension of T.120, an international standard multi-channel conference protocol issued by the International Telecommunications Union.

• RFB (Remote FrameBuffer) protocol: Graphical remote management protocol is a simple protocol for remote access to the graphical user interface. The VNC remote management tool is based on this protocol.

• Telnet: Command line interface remote management protocol. Almost all operating systems support this protocol by default. It provides users with the ability to complete remote host work on the local computer. The characteristic of this protocol is that it uses clear text transmission when transmitting data, that is, the data is not encrypted.

• SSH (Secure Shell) protocol: Command line interface remote management protocol, almost all operating systems support this protocol by default. Unlike Telnet, this protocol encrypts and compresses data during data transmission, so using this protocol to transmit data is both secure and fast.

RDP vs. RFB

Both the RDP protocol and the RFB protocol allow users to access remote systems through a graphical user interface, but the RFB protocol tends to transmit images , the RDP protocol tends to transmit instructions:

• RFB protocol will draw the window in the video memory on the server side, and then pass the image to the client. The client only needs to decode the obtained image and display it. Yes;
• RDP will hand over the drawing work to the client, and the server needs to make appropriate adjustments based on the display capabilities of the client.

Therefore, to complete the same operation, the amount of data transmitted using the RFB protocol will be larger than that of RDP, and RDP has more stringent requirements on the client than RFB. RFB is suitable for thin clients, while RDP is suitable for Low speed network.

Thin clients are compared to fat clients. For example, when people use QQ, they need to download the client, which is a "fat client"; on the contrary, you can check the Internet through a browser All kinds of information, no need to download any other software, this is a "thin client". To simply understand, thin client refers to reducing the burden on the client as much as possible, and most of the work is completed by the server; thick client is the opposite.

Telnet Comparison with SSH

Telnet protocol and SSH protocol are both command line remote management protocols. They have common application fields and are often used for remote access to servers.

Compared with the Telnet protocol, the SSH protocol encrypts the data when sending data, making data transmission more secure. Therefore, the SSH protocol replaces the Telnet protocol in almost all application fields.

In some testing situations where encryption is not required (such as LAN), the Telnet protocol is still often used.

Linux remote management software

Based on the above 4 remote management protocols, Linux remote management server software can be divided into the following 3 types:

• Similar Graphical remote management software based on VNC (based on RFB protocol), such as Remote management, this management method only provides a simple management window, and the available management functions are limited;
• Due to security and stability considerations, most servers abandon the graphical management interface and choose Command line interface, so remote management of Linux servers often uses command line management based on the SSH protocol.
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