We need to support scoped IPv6 addresses in Inet6Address as defined in draft-ietf-ipngwg-scoping-arch-04.txt.

The Windows IPv6 implementation and the Linux IPv6 implementations support it
already. It will also be supported by Solaris 10.

Scoped IPv6 addresses are used for non-global addresses, and are basically
used to specify to which interface a non-global address applies.