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Content Delivery and the Natural Evolution of DNS

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Executive Summary

Content Delivery Networks (CDNs) rely on the Domain Name System (DNS) for replica server selection. DNSbased server selection builds on the assumption that, in the absence of information about the client's actual network location, the location of a client's DNS resolver provides a good approximation. The recent growth of remote DNS services breaks this assumption and can negatively impact client's web performance. In this paper, the authors assess the end-to-end impact of using remote DNS services on CDN performance and present the first evaluation of an industry-proposed solution to the problem. They find that remote DNS usage can indeed significantly impact client's web performance and that the proposed solution, if available, can effectively address the problem for most clients.

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