对于将企业内部网连到Internet上的中小企业而言,凭借防火墙阻断来自外部对内部网络的威胁和入侵,阻止内部用户对服务器的非授权访问,禁止内部向外发起非法连接等,是最主要的网络安全保护措施。但由于财力、IT技术实力和人力的局限,中小企业选择防火墙解决方案时,在关注方案7× For the small and medium-sized enterprises that connect the intranet to the Internet, it is the most important if the firewall blocks external threats and intrusion into the internal network, prevents internal users from unauthorized access to the server, and prohibits internal and external illegal connections. The main network security protection measures. However, due to financial, IT technical strength and the limitations of manpower, SMEs choose firewall solutions, the program of concern 7 ×