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A third option, called 6rd, was used by the French ISP Free to rapidly deploy IPv6 to its residential customers by encapsulating IPv6 packets for transmission over IPv4 backbone networks.
End users can choose from a variety of tunneling techniques, including 6to4, Teredo and ISATAP for carrying IPv6 packets over IPv4 networks, but these techniques raise security concerns.
Read more about lans & wans in Network World's LANs & WANs section.