Abstract: With the rapid development of the Internet,as an important means of network security,firewall has become the focus of research.In order to effectively filter the irrelevant data packets,resist the malicious attacks,and ensure the safe and stable operation of the network,on the basis of researching on the deep packet inspection (DPI) technology,a firewall system based on field programmable gate array (FPGA) and ternary content addressable memory (TCAM) was presented.The test results show that the designed firewall system based on deep packet inspection technology can meet the actual requirements.

Key words: DPI,Hardware firewall,Field programmable gate array,Ternary content addressable memory