Thoughts on IPv6 in the DNS root
A few weeks ago, RIPE NCC, the "European" RIR, added a few more IPv6-enabled K root servers. As you may recall, back in February, IANA enabled IPv6 glue in the DNS root. With RIPE NCC's recent additions, there are now at least 33 IPv6-enabled root servers (out of 150 total servers). I say at least because I don't have any information on which J root servers have IPv6.
Here's a handy Google Map widget showing their locations:
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I was surprised to see so many servers in North America, since that region tends to lag behind Europe and Asia for IPv6 deployment. In fact, the Asia/Pacific region has the fewest number of IPv6 servers of any RIR:
|RIPE NCC||42 %|
While it's good to see more IPv6-enabled servers, the more important issue is increasing IPv6 traffic to the root. Just after the IPv6 glue was added to the root, the K root saw an almost five-fold increase in IPv6 traffic. However, this still only works out to 1.2% of its queries over IPv6:
The H root has similar results. While the number of IPv6 queries has steadily increased since February, 2008, it still receives less than 1% of its queries over IPv6:
The M root saw the same thing: Only 1% of their queries are over IPv6:
At RIPE-56, Geoff Huston gave a presentation comparing IPv4 -vs- IPv6 queries in APNIC's root servers. He found that IPv6 queries peaked at 1% of the total number of queries. Likewise, at the 2008 Global IPv6 Summit in Korea, it was revealed that Japan's authoritative servers get at best 1.4% of their queries over IPv6. And Japan was one of the first countries to add AAAA glue.
Comparatively speaking, there are only a handful of DNS servers on the Internet. It's fairly easy to get them IPv6-enabled. It will be a much harder task to IPv6-enable the billion+ PCs on the Internet (which is expected to double by 2014). And that number doesn't include non-PC devices, which make up an increasingly large number of network-attached devices. It's time to get to work, folks.
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