This feature is new in the Solaris 9 4/03 release.
IPv6 networks can now transfer packets over Internet Protocol Version 4 (IPv4) networks by configuring one or more routers to support a 6to4 tunnel. System administrators can use 6to4 tunnels as a transitional method for migrating their networks from IPv4 to IPv6. This feature implements RFCs 3056 and 3068.
For further information on IPv6, see the IPv6 Administration Guide.