网络技术的飞速发展给我们带来了许多便利,但同时,网络安全问题也威胁着每一个网络用户。防火墙是保障网络安全的重要手段。目前,最常用的是软件防火墙,这种防火墙会占用有限的系统资源,影响通信的效率。本文将基于嵌入式系统来设计一种硬件防火墙,使它兼备网卡和防火墙双重功能。 The rapid development of network technology has brought us a lot of convenience, but at the same time, network security issues also threaten every network user. Firewall is an important means to ensure network security. Currently, the most commonly used is a software firewall, this firewall will occupy limited system resources, affecting the efficiency of communications. This article will be based on embedded systems to design a hardware firewall, making it both network card and firewall dual functions.