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Thanks for clarifying this! So this 25% really is consumer traffic, and Verizon is so high because they default to preferring IPv6 servers when available? That's great news for IPv6 adoption. It's also consistent with what's reported later in the article, about IPv6 prevalence at various other installations.

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As zaphoyd said, Verizon doesn't default to IPv6. Dual-stack devices should be using the Happy Eyeballs [1,2] algorithm to choose whether to use IPv4 or IPv6.

[1] http://tools.ietf.org/html/rfc6555

[2] http://en.wikipedia.org/wiki/Happy_Eyeballs

"defaulting" to IPv6 is something that is done on the DNS/client end. Verizon is so high because they have a brand new network that was built from the ground up with mandatory IPv6 support for all devices required. See the presentation notes that ejdyksen posted above for more information.

For mobile networks IPv6 has a better business case than most networks. Mobile networks are new enough that they don't typically have large blocks of addresses ready to use so every IPv6 packet is one that doesn't take resources on your expensive CGN gear. T-mobile's wireless network is also fully IPv6 enabled.

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