Introduction #

In modern computer networks, TCP（Transmission Control Protocol）serves as the foundational protocol for internet communication and plays an indispensable role. TCP is not only responsible for reliable data transfer but also ensures network connection stability and efficiency through complex handshakes and flow control mechanisms. It is a connection-oriented, reliable, byte-stream-based transport layer protocol that ensures the reliable transfer of data between various applications.

However, in the design and implementation of the TCP protocol, there is a mechanism that, although important, is often overlooked—TCP Reset (TCP Reset). In certain situations, TCP sends a “reset” (RST) segment to terminate the currently ongoing data transmission, which is commonly referred to as TCP Reset. This mechanism can have significant negative impacts on network security and system stability in some cases. This article will delve into the hazards and implications of TCP Reset and provide a detailed explanation of how to address this issue.

Preface #

In the modern internet ecosystem, the Domain Name System (DNS) is a critical infrastructure that connects users to websites, playing an indispensable role. Simply put, DNS acts like an address book on the internet, converting human-friendly domain names (such as www.example.com) into IP addresses that computers can understand (like 192.168.1.1). However, this seemingly basic function hides a severe security risk. In certain circumstances, DNS servers can be maliciously manipulated or tampered with, leading to interference in user query results—a phenomenon known as DNS poisoning.

Introduction #

In today’s fast-paced era of informatization, the network has become a critical infrastructure for societal operations, with cybersecurity serving as the core element to ensure the stable operation of this infrastructure. As a firewall product occupying a significant position in the field of cybersecurity, “Great Wall Firewall” leverages its robust technical capabilities and innovative solutions to implement internet regulation as an essential tool for safeguarding national information security. This article will delve into the functional design, core technology, and security strategies of the Great Wall Firewall from a technical perspective, showcasing the professionalism and reliability of this cybersecurity product.