"The reason why modern end host systems prefer to use IPv4 is that auto-tunneling using either 6to4 or Teredo is lousy. The experience simply is atrocious!" Huston says. "So when we measure the amount of end hosts that prefer to use IPv6 in a dual stack scenario we are in fact looking at old end host systems that are not being maintained in terms of software releases from the vendor and a small number of end hosts that have native IPv6 service from their service providers."
Huston says observers shouldn't expect IPv6 traffic volumes to rise significantly on or immediately following World IPv6 Day. That's because IPv6 traffic volumes will only rise for end users with native IPv6 service from their ISPs.
"How many folk will see a difference [on World IPv6 Day]?" Huston asks. "At most 0.3% of folk. It's hardly a shattering number."
Instead, Huston recommends that the Internet engineering community measure the success of World IPv6 Day in terms of reducing the fear that website operators have about the cost and hassle of upgrading to IPv6.
World IPv6 Day "is intended to turn the Internet, or at least the Web content delivery part of the network, into a laboratory for 24 hours [so we can] see what happens when a mono-stack world turns into a dual-stack world," Huston says. "In and of itself, it won't get the IPv6 ball rolling."
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