Research and Design of the Mixed Firewall Based on the Filtering Technology

With the deep research to the packet filtering technology, this paper designs the double filtering technology program combining NDIS intermediate driver filter technology with SPI interface filter technology. It implements the system architecture and function module for the mixed firewall, proposes the mixed protection method based on the combination of user and kernel mode, and uses database to achieve the rule setting and log management. These approaches improve the performance of firewall in terms of efficiency, stability and safety.