It's well known that with the rapid development of Internet, internet is turning to be one of the most important instruments of getting information. More and more official network, personal computer and portable equipment have become the knots of the network; therefore it has turned into one of the greatest inventions in the last century.However, the original design of Internet hasn't considered the importance of the net security. At present with the appearance of the E-commerce and E-government, the security of Internet has become a great barrier in the development of Internet. Governments, companies and research institutions in various countries have strengthened the research and the development of the Internet security products. The research connected with gateway technology is popular nowadays. The correlative technology of security and product market overseas is mature, but in domestic market, we are just in the fundamental phase. Most companies have not developed mature products. Since the legislature has been enacted, the circumstance changed. People pay much more attention to the net security and the home security market gradually developed.This paper successfully presents a design plan of the embedded security gateway based on the research of the embedded system, concerning the theory and the technology, which not only entails the firewall, the technology of VPN, but also manifests the structure specialties, including the compacted-structure, stable-capability and convenient-configuring. To the hardware, the paper adopts the co-work structure of POWERPC and DSP, forming a conspicuous trait of this security gateway, which has considered the application characteristic of the embedded security gateway. |