The Web is Still Small After More Than a Decade
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 c...
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Zusammenfassung: | 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. |
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DOI: | 10.48550/arxiv.2004.04623 |