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当网络管理员刚刚装完公司的防火墙,报怨就会蜂拥而至:“我的浏览器失效了!”、“为什么我会收到这样的消息?”以及“主机没发现”等错误。最有可能的是旧的DNS(域名系统)在作怪。实际上,整个防火墙跟踪过程中最头疼的事是适当地配置防火墙前后的域名系统。防火墙可将内部网络与Internet隔离开,在防火墙建立以前,公司的DNS或许能够在Internet上查找。如果切断了对Internet DNS的自由访问,旧的URL到IP地址解析
When the network administrator just installed the company’s firewall, the resentment swarmed: “My browser is down!”, “Why do I get such a message?” And “The host did not find it” error. Most likely the old DNS (Domain Name System) at play. In fact, the most troubling thing about the entire firewall tracking process is to properly configure the domain name system before and after the firewall. Firewalls separate the internal network from the Internet. Before a firewall is established, the company’s DNS may be able to find it on the Internet. If you cut off Internet DNS free access, the old URL to IP address resolution