Because of 1 out of every 2000 users are "broken" based on measurements published by major content providers so far. Popular web sites are as yet unwilling to publish to IPv6, until this level of broken decreases.
When you go to your favorite web site in a browser, and it hangs for several seconds or even minutes. If the publisher publishes to IPv6, and your computer has a *broken* IPv6 route (as compared to having no route), then your computer will attempt to use that broken route first, before falling back to the IPv4 internet.
Newer operating systems have IPv6 enabled by default. Older ones, may have IPv6 enabled, as a result of user action (or specific applications). Enabling IPv6 does not automatically make you vulnerable.
The problem lies when your system is convinced to try and use IPv6, when it is not working adequately. This may be because you're using a public service for your IPv6 gateway. Or, someone on your network, was advertising (to the network) IPv6 through internet connection sharing; and they left. Last, your router may have IPv6 automatically configured to use public unmanaged gateways; and is telling your computer to use it.
The simplest, yet near-sighted, solution, would be just to disable IPv6. However, over the next couple of years, this will start to cause you more troubles than not. It would be best to instead find the root of your actual problem, and fix that instead.
What is missing on this site now is the self-help. The site is now able to detect several issues, but the most important one (connections timeout to ipv6, instead of failing fast or succeeding) I can't do much with the javascript to further isolate.
End users running this tests, who have a broken condition, will be asked to share some information about their setup. The more we understand the symptoms and what they mean, the better we can guide users to a happy resolution.
If you have the resources to help assist with diagnosing these end users, and/or provide other assistance with writing howtos and the like, please see http://test-ipv6.com/partnering.html.
Copyright (C) 2010, 2011 Jason Fesler. All rights reserved. -- r396
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