IPv4 and IPv6 are incompatible protocols. For this reason, transition to the new protocol cannot be expected to be painless, and will involve significant costs for service providers and customers alike. If we compare the costs of transition with the non-transition mode or using IPv4 with supporting new services, then it can help us identify the best time to start the transition process .Whenever transition begins there will be no single “flag day” on which the all-IPv4 network turns into an IPv6 network.
.More at VM Times
http://vmtimes.com/2009/05/ipv6-tunneling-over-ipv4-infrastructure/
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