十多年后，网络仍然很小
The Web is Still Small After More Than a Decade
摘要：
出于各种原因，理解Web托管是必不可少的。例如，它可以帮助人们评估拒绝服务攻击或基于IP的阻止可能对托管网站的可用性造成的附带损害。然而，自2007年进行第一次研究以来，已经过去了十多年。互联网的基础设施发生了巨大的变化，从那时起，需要重新研究，以了解网络托管的性质。在本文中，我们进行了一项实证研究，重新访问网络共址使用主动DNS测量收集的数据集。我们的研究结果表明，网络仍然很小，集中在少数托管服务提供商。更具体地说，我们发现超过60%的网站与至少10个其他网站位于同一地点-一组包括不太受欢迎的网站。相比之下，17.5%的最受欢迎的网站是从自己的服务器提供服务。虽然高度的Web托管可能会使共同托管的网站容易受到DoS攻击，但我们的研究结果表明，共同托管许多网站并从主要提供商的配置良好的内容分发网络（CDN）提供服务是一种日益增长的趋势，这些提供商提供高级DoS保护。不管高度的网络协同定位，我们对流行的阻止列表的分析表明，基于IP的阻止不会像以前认为的那样造成严重的附带损害。
英文摘要：
Understanding web co-location is essential for various reasons. For instance, it can help one to assess the collateral damage that denial-of-service attacks or IP-based blocking can cause to the availability of co-located web sites. However, it has been more than a decade since the first study was conducted in 2007. The Internet infrastructure has changed drastically since then, necessitating a renewed study to comprehend the nature of web co-location. In this paper, we conduct an empirical study to revisit web co-location using datasets collected from active DNS measurements. Our results show that the web is still small and centralized to a handful of hosting providers. More specifically, we find that more than 60% of web sites are co-located with at least ten other web sites---a group comprising less popular web sites. In contrast, 17.5% of mostly popular web sites are served from their own servers. Although a high degree of web co-location could make co-hosted sites vulnerable to DoS attacks, our findings show that it is an increasing trend to co-host many web sites and serve them from well-provisioned content delivery networks (CDN) of major providers that provide advanced DoS protection benefits. Regardless of the high degree of web co-location, our analyses of popular block lists indicate that IP-based blocking does not cause severe collateral damage as previously thought.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
