防火墙作是因特网与用户网络之间建成的防护网络,以避免特洛伊木马、病毒与网络黑客的影响,阻止未授权的外部网络入侵。防火墙由网络安全域和不同网络间的硬件、软件设备构成,最后达到限制用户内部网络访问与管理的权限。本文结合防火墙概念、作用,对防火墙技术的安全防护进行了简单的分析。 The firewall is a built-in protection network between the Internet and the user network to avoid the influence of Trojans, viruses and network hackers and to prevent unauthorized external network intrusion. Firewall by the network security domain and the different networks between the hardware and software equipment, and finally to limit the user’s internal network access and management authority. In this paper, the concept of firewall, the role of the security of firewall technology for a simple analysis.