said by Johkal: said by paul248:
6to4 is arguably worse than not having IPv6 at all.
Because 6to4 relies on anycast routing, through equipment operated by arbitrary third parties. Its performance and reliability are unpredictable, and problems are difficult to debug.
A few years ago, there was an effort to de-prioritize 6to4 in the major OSes and browsers. You can see the results in the declining red line here:
»www.google.com/intl/en/i ··· ics.html
The neutering of 6to4 was one of the changes that made World IPv6 Launch possible.