科学上网是自由访问互联网的一种方式，许多网络用户不得不采用该方法以访问被封锁的网站或绕过地区限制。
然而，DNS（域名系统）污染成为了科学上网的一个常见问题。
DNS污染指的是在域名解析过程中，网络运营商或政府机构对DNS解析进行故意干扰和篡改。
这种干扰可能会导致用户无法正确访问特定的网站，或者被重定向到错误的网址上。
DNS污染对科学上网产生了负面影响。
当用户尝试访问境外禁止或限制的网站时，DNS污染可能会使得网站无法访问，从而阻碍用户获取信息和自由表达的权力。
为了克服DNS污染，科学上网用户可以使用一些有效的方法。
例如，可通过更改计算机或移动设备的DNS服务器地址来实现。
用户可以使用公共DNS服务器或自建DNS服务器，以确保DNS解析不受到干扰。
另外，虚拟私人网络（VPN）也是科学上网的一种常见手段。
通过VPN，用户的互联网连接会经过加密和隧道以避免被网络运营商或政府机构检测到，从而实现科学上网的目的。
综上所述，科学上网DNS污染限制了互联网自由。
了解DNS污染及应对方法，对于科学上网用户是至关重要的。
只有通过合理的技术手段，我们才能享受到更自由的互联网体验。
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随着互联网的快速发展，VPN在中国的应用也日益普及。
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