ACL的网络病毒过滤-随着网络技术的不断发展，出现了大量的基于网络的服务，网络安全问题也就变得越来越重要。ACL即访问控制列表，它是工作在OSI参考模型三层以上设备，通过对数据包中的第三、四层中的包头信息按照给定的规则进行分析，判断是否转发该数据包。基于ACL的网络病毒的过滤技术在一定程度上可以比较好的保护局域网用户免遭外界病毒的干扰，是一种比较好的中小型局域网网络安全控制技术。-ACL' s network virus filtering- With the continuous development of network technology, there has been a large number of web-based services, network security problems will become increasingly important. ACL is Access Control List, which is working in the OSI reference model layer above device, the data package through the third, four in the header information in accordance with the rules of a given analysis to determine whether the packet forwarding. Network-based virus filtering ACL in a certain extent, the better to protect LAN users from the virus outside interference, is a relatively good control of small and medium local area network security technology.