This policy setting allows you to configure 6to4 an address assignment and router-to-router automatic tunneling technology that is used to provide unicast IPv6 connectivity between IPv6 sites and hosts across the IPv4 Internet. 6to4 uses the global address prefix: 2002:WWXX:YYZZ::/48 in which the letters are a hexadecimal representation of the global IPv4 address (w.x.y.z) assigned to a site.If you disable or do not configure this policy setting the local host setting is used.If you enable this policy setting you can configure 6to4 with one of the following settings:Policy Default State: 6to4 is enabled if the host has only link-local IPv6 connectivity and a public IPv4 address. If no global IPv6 address is present and no global IPv4 address is present the host will not have a 6to4 interface. If no global IPv6 address is present and a global IPv4 address is present the host will have a 6to4 interface.Policy Enabled State: If a global IPv4 address is present the host will have a 6to4 interface. If no global IPv4 address is present the host will not have a 6to4 interface.Policy Disabled State: 6to4 is turned off and connectivity with 6to4 will not be available.