什么是DNS污染?

DNS即域名系统。这是一个全球性网络系统,能把域名(例如: domain.com)映射为IP地址(例如: 1.2.3.4)。DNS污染是指对域名系统的刻意干扰,使域名指向不正确的IP地址。发生这种状况时,用户无法访问目标网站,或者被重定向到某个不同的网站。

DNS查询会根据查询请求来源国家的不同,而返回不同的IP地址。这种状况已经有合理的解释。因此,目前为止,本站无法判断某个网站是否受到跟网络审查有关的DNS污染,我们只能断定某网站没有受到DNS 污染,如果满足:

  1. 在美国访问时,主机域名指向某个IP 地址,同时
  2. 在中国访问时,主机域名指向同一个IP地址。

如果域名指向不同的IP 地址,该网站有可能受到DNS污染。网站是否被dns污染,还有其他判断标准,如连接被重置,访问超时等。

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DNS spoofing, also referred to as DNS cache poisoning, is a form of computer security hacking in which corrupt Domain Name System data is introduced into the DNS resolver's cache, causing the name server to return an incorrect IP address. You should use Dedicated Proxies to resolve this problem.

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