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The rapid development of the Internet to people's lives has brought great convenience, but at the same time, the Internet also is facing an unprecedented threat. Therefore, how to use effective and feasible ways of making the network can be dangerous to the people within the scope of the receiver have attracted more and more attention. And how to implement prevention strategies, first of all depends on the security of the current system. Therefore, the independent network security elements -- vulnerability scanning, intrusion detection, firewall and anti-virus risk assessment is necessary.
Firewall as a more mature current network security technologies, its security is directly related to the user's personal interests. For independent network security elements -- the technology of firewall, the firewall log file analysis, design the corresponding mathematical model and prototype software, a points system the method, what the system's security level, to achieve the goal of network security risk assessment, in order to improve the system security to provide a scientific basis. The main threats to network security in : unauthorized access, posing as legitimate users, data integrity, interfere with the normal operation of the system, using the network to spread the virus, wiretap etc.. This requires us and Internet interconnect brings security problems be paid attention. The rapid development of computer network technology make the network security problems have become increasingly prominent, while the firewall is the most widely used security products. This paper expounds the working principle of network firewall and the advantages and disadvantages of the traditional firewall are analyzed, finally, computer science and other fields related to the new technology, puts forward a new firewall technology, and its development prospects.

The rapid development of the Internet to people's lives has brought great convenience, but at the same time, the Internet also is facing an unprecedented threat. Therefore, how to use effective and feasible ways of making the network can be dangerous to the people within the scope of the receiver have attracted more and more attention. And how to implement prevention strategies, first of all depends on the security of the current system. Therefore, the independent network security elements -- vulnerability scanning, intrusion detection, firewall and anti-virus risk assessment is necessary.

Firewall as a more mature current network security technologies, its security is directly related to the user's personal interests. For independent network security elements -- the technology of firewall, the firewall log file analysis, design the corresponding mathematical model and prototype software, a points system the method, what the system's security level, to achieve the goal of network security risk assessment, in order to improve the system security to provide a scientific basis. The main threats to network security in : unauthorized access, posing as legitimate users, data integrity, interfere with the normal operation of the system, using the network to spread the virus, wiretap etc.. This requires us and Internet interconnect brings security problems be paid attention. The rapid development of computer network technology make the network security problems have become increasingly prominent, while the firewall is the most widely used security products. This paper expounds the working principle of network firewall and the advantages and disadvantages of the traditional firewall are analyzed, finally, computer science and other fields related to the new technology, puts forward a new firewall technology, and its development prospects.

Key words: application layer gateway distributed firewall packet filtering firewall firewall monitoring embedded intelligent firewall network security firewall protection strategy development trend

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