BlogReveal how the SOCKS5 agent works

Reveal how the SOCKS5 agent works

2023-07-21 11:14:28

The SOCKS protocol is a set of open software standards developed by the Internal Engineering Working Group to deal with cybersecurity issues. Similar to a wall, the SOCKS protocol is sandwiched between the Internal server and the user client, providing traffic and security management for information entering the corporate network.

SOCKS5 is an intermediary protocol between front-end machines and server machines that communicate using the TCP/IP protocol. It enables front-end computers in the Intranet to access servers on the Internet, thus enhancing the security of communication. In front-end computers that support the SOCKS5 protocol, there are generally two operating states:

1, direct communication state: In the direct communication state, the communication between the front-end computer and the target server is direct, without going through the SOCKS5 agent. This means that the front-end computer sends the request directly to the target server and receives the response directly from the server, without the intervention of an intermediate agent. This communication mode is applicable to the scenario where the terminal server does not need a proxy.

In the direct communication state, the front-end computer's request passes directly through the enterprise network boundary and directly to the target server. This method of communication is simple and direct, and does not require additional transit, so it can often achieve faster response speed and more stable connections.

①Why choose a residential agency IP?

However, the direct communication state also has some limitations and potential security risks. First, because there is no proxy protection, the real IP address of the front-end computer is directly exposed to the target server, making it easy to trace. For some scenarios where privacy and anonymity need to be protected, direct communication may not be the most appropriate option.

Second, because the proxy server is bypassed, the front-end computer may not be able to implement the access control and security policies of the enterprise's internal network in the direct communication state. This could result in some sensitive data or resources being accessed by unauthorized users, increasing cybersecurity risks.

Therefore, when using the SOCKS5 agent, you can choose whether to enter the direct communication state according to the specific situation. For some tasks that require high security and anonymity, it is best to use the SOCKS5 proxy to carry out secure transit and hide the real IP address through the proxy server. In some specific scenarios, if you ensure that the target server is trusted and does not need to go through a proxy, you can choose the direct communication state to obtain faster access speed and simple connection. Considering various factors comprehensively, reasonable selection of communication mode will help to improve the efficiency and security of network communication.

2. SOCKS5 state: In the SOCKS5 state, the front-end computer communicates with the SOCKS5 server through the SOCKS5 interface to request access to the final server. When initializing a session, the front-end passes the IP address and port information of the target server to the SOCKS5 server, so that the SOCKS5 server can start and manage the communication process with the final server in strict accordance with the requirements of the front-end.

The whole process can be likened to the front-end computer entrusting the SOCKS5 server to contact the target server on its behalf. After the front-end computer makes requests, the SOCKS5 server forwards them to the actual target server, and in doing so, the SOCKS5 server simulates the behavior of the front-end computer, making it appear as if the target server is communicating directly with the front-end. When sending a request to the real server, the SOCKS5 server does not make any changes to the request packet, but forwards it to the target server in its original form, and after receiving the response from the real server, forwards it to the front-end computer in its original form.

②What are the differences between forward proxy and reverse proxy

SOCKS5 protocol works on the session layer, which makes it a solution to provide security services between the session layer and the session layer. Since the SOCKS5 agent works at a lower network level, it is not concerned with the details of the high-level application, and therefore is not restricted by the high-level application protocols (such as FTP, HTTP, NNTP requests, etc.). This means that the SOCKS5 proxy is not affected by the application protocol, and can implement the proxy function for various applications that support the TCP/IP protocol.

Because the SOCKS5 agent works at the session layer, it has a high degree of versatility and flexibility. Unlike other proxy protocols, the SOCKS5 proxy does not require specific client support, making it suitable for a variety of applications and operating system platforms. This characteristic makes SOCKS5 agent become a very general and practical proxy protocol, widely used in network security and data transmission scenarios.

The SOCKS5 proxy is a proxy server that uses the SOCKS protocol. The default port is 1080. The SOCKS5 agent that works at the session layer does not require the application to adhere to a specific operating system platform. Therefore, it simply transmits the packet and does not interfere with the content of the packet. This makes it much freer to use SOCKS5 agents without worrying about application protocol restrictions. If you want to have higher security and wider applicability when using proxies, SOCKS5 proxies are a good choice.

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