多设备防火墙安全策略冲突分析

摘要

The firewall is the agent technology as the most commonly used security barrier in the network,packet filtering technology, stateful inspection technology, network address translation technology （NAT）,VPN technology to ensure the security of your computer.Internet firewalls can prevent external users to the illegal use of the internal network resources,to strengthen the network and network access control,thereby preventing the private data of a firewall to protect the internal network by outsiders to steal or change.%防火墙是作为网络中最常用的安全屏障以代理技术、包过滤技术、状态检查技术、网络地址转换技术（NAT）、VPN技术等功能，保证了计算机的安全性。Internet防火墙可以有效防止外部用户非法使用内部网的资源，加强网络与网络间的访问控制。从而阻止防火墙所保护的内部网络的私密数据被外人所窃取或更改。