本文目的是演示Linux中的SOCK_PACKET插口的使用方法，实现对网络数据帧的捕获，编程方法简洁高效，可广泛应用在网络数据的分析、过滤和协议变换上。作者通过对Linux系统的编程实践，提出了一些思考，希望对读者有所启发-purpose of this paper is a demonstration of Linux SOCK_PACKET jack way to use the network to achieve the data frame capture, programming simple and efficient method, which is widely used in network data analysis, filtering and transformation of the agreement. The author of the Linux programming practice, some think, and I hope to inspire readers