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近年来,网络犯罪的递增、大量黑客网站的诞生,网络系统的安全问题越来越受到重视。网络系统的安全对于国家机关、银行、医院是至关重要的。因此,安全保密工作越来越成为网络建设中的关键技术,防火墙技术就是其中重要的一环。防火墙相当于一个控流器,可用来监视或拒绝应用层的通信业务,它通过建立一整套规则和策略来监测和限制穿过防火墙的数据流,允许合法数据包通过,组织非法数据包通过,从而达到有效保护内部网络安全的目的。
In recent years, the increase of cybercrime, the birth of a large number of hacker websites, and the safety of network systems have drawn more and more attention. The security of the network system is of vital importance to state agencies, banks and hospitals. Therefore, the work of security and confidentiality has increasingly become the key technology in network construction, and the firewall technology is one of the most important parts. The firewall is equivalent to a flow controller, which can be used to monitor or reject application layer communication services. It monitors and limits the flow of data through the firewall by establishing a set of rules and policies, allowing legal data packets to pass through, organizing illegal data packets to pass through, So as to achieve the purpose of effectively protecting the internal network security.