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I took a DMOZ[1] dump, extracted all unique domain-name port combinations
and checked their IPv6 connectivity.
3 388 012 : 100.000% : total
3 260 296 : 96.230% : IPv4 only
122 560 : 3.620% : bad NS
3 372 : 0.100% : IPv6 working
1 694 : 0.050% : broken or "fake" IPv6
broken: TCP connect failed
fake: IPv6 mapped IPv4 addresses (e.g. ::ffff:1.2.3.4)
33.4% of all services that advertised IPv6 failed to deliver or in
other words the IPv6 failure rate is ten times the NS failure rate.
Seems high, thus a cross check via TLDs' NS:
270 : 100.0% : TLD total (excluding the IDN tests)
268 : 99.3% : IPv4 working
2 : 0.7% : IPv4 broken (HM and KP)
177 : 65.6% : IPv6 working
8 : 3.0% : IPv6 broken
1910 : 100.0% : NS total
1500 : 78.5% : IPv4 only
31 : 1.6% : IPv4 broken
356 : 19.1% : IPv6 working
23 : 1.2% : IPv6 broken
IPv6 failure rates of 4.3% (TLD) and 6.1% (NS) is lower than the above
33.4% but are still significantly higher than the IPv4 failure rates of
0.7% (TLD) and 1.6% (NS). TLD root-NSs usually are managed by dedicated
infrastructure organisations thus better trouble shooting than the DMOZ
listed ones get is expected and suggests the above 33.4% failure rate
isn't some kind of sampling artifact.
About 4 days later I did a more detailed check of the hosts with
broken IPv6:
1624 : hosts total
827 : connection timed out
382 : no route to host
249 : connection refused
95 : network unreachable
54 : SixXS never received a route announcement for that block
43 : broadcast address
30 : * IPv4 in IPv6
22 : IPv6 assignments reclaimed (3ffe::/16)
16 : * no IPv6 (::)
12 : * IPv4 only
10 : * IPv6 working
4 : IPv6 never assigned
4 : local (fe80::/10)
2 : local (::1)
2 : broken NS
Issues(cases not marked with a star) do tend to arise
but why are fundamental issues like "connection timed out",
"no route to host" and "connection refused" so frequent?
(testing was done from 2a01:4d0:102::31)
Thomas
[1] http://www.dmoz.org/help/getdata.html
