Introduction - If you have any usage issues, please Google them yourself
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.