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The understanding of IPv6 deployment is surprisingly limited. In fact, it is not even clear how the authors should quantify IPv6 deployment. This paper collects and analyzes a variety of data to characterize the penetration of IPv6. The authors show that each analysis leads to somewhat different conclusions. For example: registry data shows IPv6 address allocations are growing rapidly, yet BGP table dumps indicate many addresses are either never announced or announced long after allocation; Netflow records from a tier-1 ISP show growth in native IPv6 traffic, but deeper analysis reveals most of the traffic is DNS queries and ICMP packets; a more detailed inspection of tunneled IPv6 traffic uncovers many packets exchanged between IPv4-speaking hosts (e.g., To traverse NAT boxes).
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