IPv6 DNS root performance

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Last week, six of the DNS roots got IPv6 addresses. This begs the question: How well does the IPv6 internet perform? What's the network latency to reach the root servers over IPv4 versus IPv6?

I did some ping tests from AS3999. The F root isn't too much slower over IPv6, J and M are actually faster over IPv6, and K is a lot slower. It isn't surprising that the K root is slower, since it has only one host in North America (the rest are in Europe and Asia).

Contrary to popular belief, IPv6 isn't always slower than IPv4. In some cases, it's significantly faster!

Here's the raw data:

F server:
IPv4: round-trip min/avg/max = 75.096/75.122/75.142 ms
IPv6: round-trip min/avg/max = 88.437/89.268/90.966 ms

J server:
IPv4: round-trip min/avg/max = 120.905/121.093/121.335 ms
IPv6: round-trip min/avg/max = 90.373/91.438/93.089 ms

K server:
IPv4: round-trip min/avg/max = 91.265/91.540/92.323 ms
IPv6: round-trip min/avg/max = 171.145/171.990/172.969 ms

M server:
IPv4: round-trip min/avg/max = 174.806/175.067/175.411 ms
IPv6: round-trip min/avg/max = 89.096/90.527/92.050 ms

The A and H servers aren't pingable over IPv4, so I excluded them.

(As an aside, notice that above I said "DNS roots" not "servers." There are 13 addresses for the DNS root servers. But there are a hell of a lot more than 13 root servers.)

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