If you want to configure a 6to4 interface, enter y. You want to configure a 6to4 interface if you are a v4/v6 host connected to an IPv4-only network and you want to communicate with other 6to4 or native IPv6 sites. This will create a 6to4 site that contains only this host. The utility will prompt you for 6to4 interface information.      

For hosts within a 6to4 site, do not configure a 6to4 interface as a 6to4 address will be automatically configured using standard IPv6 mechanisms. For these and all other hosts, press [Enter] to accept the default, and the utility continues at Footnote 9.