Many ISP's (but certainly not all) provide you a single real IPv4 address on whatever the first device is in your location ... usually your own personal router. Linksys, or whatever.
As long as you have a real IPv4 address, then you can use 6to4 trivially. By simply clicking the 6to4 checkbox to enable 6to4, you're able to use IPv6 over an ISP which only supports IPv4. (Side Note: Which OSes handle this well? Win7: Device manager, Action, Add legacy hardware, Microsoft 6to4. OSX Snow Leopard: Network Preferences, add 6to4.) In a 6to4 address, 16 bits are arbitrarily selected by the device. So I logically conclude: If your little linksys or whatever router supports 6to4, and it can distribute IPv6 to the autoconfigure clients on your LAN, that means you don't even need to do *any* thing to your windows/mac/whatever laptops etc. Just enable the checkbox for 6to4 in your little router, and voila, you have IPv6 running on your LAN. Anybody doing anything like this in practice, or am I just talking theory at this point? Unfortunately, I can't test it myself, because I'm one of the saps who doesn't get a real IP address from their ISP.
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