For client-server networking, NAT traversal is a solved problem. For peer-to-peer networks it is not possible to do in general, but the potential of these networks in the liberation of users from "central" services is quite big. The 6bed4 tunnel allows applications to be designed as peer-to-peer IPv6 applications with only a fallback (to your own tunnel server) if necessary.
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IPv6 brings benefits in terms of network address policy, peer-to-peer support and privacy. By reducing IPv4 to backward compatibility we set the tone for a long-overdue transition. The approach given below makes it very attractive too; full IPv6 benefits for those who make the effort to at least install a tunnel, with fully reliable client-server usage patterns for those who stick to IPv4.
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IPv4 is no longer possible without NAT, which holds back the development of the Internet. In short, IPv4 has served its time and should be forcefully replaced by IPv6 in the coming 5-6 years.
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