An Internet2 IPv6 Milestone

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For the past few months, I've been keeping track of how many .edu domains have IPv6-reachable authoritative DNS. So far the results have been less than exciting: Less than 10% of Internet2 University Members had taken the plunge.

That's changed. We're now over the 10% threshold. Four more universities have IPv6 DNS:

  • Columbia University
  • University of California, Los Angeles
  • University of California, San Francisco
  • Virginia Tech

This means that 22 of the 212 Internet2 University members (or 10.4%) have IPv6-reachable DNS. Six months ago, that number was 5%. Doubling that in a few months makes me hopeful. I'm having a beer to celebrate.

I've noticed a clustering of .edu DNS. Typically one institution will provide DNS for many others. For example, UC Berkeley v6-enabled one of their DNS servers ( That box also provides DNS for Columbia, UCLA and UC San Francisco. Likewise, the University of Orgeon provides IPv6 DNS for Portland State and Internet2. And Indiana University also provides for UIUC and U. Rhode Island. There are many more examples.

These clusters are both good and bad. They're good because they provide "easy targets" for IPv6 -- by IPv6 enabling a handful of machines, you provide maximum coverage. They're bad because, often, they're the only IPv6-enabled server for a domain -- if one server at Berkeley goes down, three other universities effectively drop off the IPv6 Internet.

But I'm still taking this as a win.

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