说明：  基于Winsock 2 SPI包过滤防火墙的实现 介绍基于Winsock 2 SPI包过滤防火墙的实现方法。包过滤防火墙采用了工作在应用层的Winsock 2 SPI 作为其核心技术,利用其进行编写动态链接库(DLL),用户通过调用DLL实现数据包的过滤。此方法具有编程、调 试方便、容易实现内容过滤等优点,在防火墙方面得到广泛的应用。
(Winsock 2 SPI-based packet filtering firewall to introduce the realization of Winsock 2 SPI-based packet filtering firewall implementation. Packet filtering firewall used in the application layer of the Winsock 2 SPI as part of its core technology, the use of the preparation of its Dynamic Link Library (DLL), the user by calling the DLL to achieve packet filtering. This method has the programming, debugging convenient, easy to implement content filtering, etc., in the firewall receive a wide range of applications.)