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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