How Ready is DNS for an IPv6-Only World?

Abstract

DNS is one of the core building blocks of the Internet. In this paper, we investigate DNS resolution in a strict IPv6-only scenario and find that a substantial fraction of zones cannot be resolved. We point out, that the presence of an resource record for a zone’s nameserver does not necessarily imply that it is resolvable in an IPv6-only environment since the full DNS delegation chain must resolve via IPv6 as well. Hence, in an IPv6-only setting zones may experience an effect similar to what is commonly referred to as lame delegation.Our longitudinal study shows that the continuing centralization of the Internet has a large impact on IPv6 readiness, i.e., a small number of large DNS providers has, and still can, influence IPv6 readiness for a large number of zones. A single operator that enabled IPv6 DNS resolution–by adding IPv6 glue records–was responsible for around 20.3% of all zones in our dataset not resolving over IPv6 until January 2017. Even today, 10% of DNS operators are responsible for more than 97.5% of all zones that do not resolve using IPv6 .

SilkSecured: A Comprehensive Analysis of Security and Dependencies in China's Governmental Web Systems

“…Websites offer users a variety of services [7], and the stability and reliability of these websites largely depend on their reliance on third-party services, including Content Delivery Network (CDN), Domain Name System (DNS), and Certi cate Authority (CA) services [8,9,10,11]. Additionally, the adoption of IPv6 [12,13,14,15], the application of IPv6 in domain name resolution servers [16], Internet Service Providers (ISPs) [17,18], and the third-party components and resources on which web services rely [19,20,21,22] also impact their overall performance and availability.…”