Research On The Network Security Technology Based On Fire-Wall

The application of computer technology and development and promote the information technology revolution, computer and information technology and its extensive penetration and affinity, in aspects affect the world economy and social development. In twenty-first Century, the human life and the Internet more closely, more closely related to the. For example, E-mail, e-commerce, information platform and so on. However, various problems have appeared, such as the Internet, there are many threats and attacks, the network security is damaged, the light leakage of information, the system platform and the cyber source being attacked.Therefore, how to ensure the information is true, complete, effectively, legally transceiver, the problem of network security has become a hotspot. But the problems of network security is the most common method is to take the firewall technology. Therefore, the firewall technology is studied, and the design of different types of firewall, in order to achieve the maintenance of network security this purpose.In general, a firewall is a system or a set of system, in the internal network and external network to perform certain security strategy, it is actually a kind of isolation technology.An effective firewall should be able to ensure that all from the Internet into or to the Internet information will pass through the firewall, all through the firewall information should be inspected. Through the firewall can define one of the key points to prevent invasive; monitoring network security and give the alarm in case of abnormalities, especially for the great amount of information through the removal of inspection, but also should make log register; provides network address conversion function, help to alleviate the IP address resource issues.So use a firewall to protect computer, server and a local area network, which to a certain extent avoid attack and protect the safety of cyber source is a current popular technologies and means.This article in view of the current network in the presence of various types of threats and attacks, firstly, the key technology of network security research. The key techniques include the transmission of the data packets, packet filtering technology, agent technology, address translation technology.Then, based on the key technology of network security content, design three firewall packet filtering firewall, i.e., screened host firewall and screened subnet firewall, and the three firewall are analyzed. Among them, the main application of packet filtering firewall packet filtering technology, the realization of a simple; and screened host firewall and screened subnet firewall realize complex. But with high reliability. After that, according to the key technology of network security and three kinds of typical firewall implementation experience, completed a comprehensive network security design of large enterprises firewall. The firewall fully according to the demand of the enterprise, the enterprise network using packet filtering firewall design, on the internal network and the Internet firewall design using a screened subnet firewall design, and take other measures of network security, to achieve the protection of the enterprise network security purposes.Finally, in the whole firewall research process and the conclusion of this paper on the basis of this paper, the deficiencies, and follow-up improvement prospect.