What is TCP Reset?

March 7, 2025

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.