Using KAME code

Most applications are seamless
ftp, telnet, rsh, ssh, ...
telnet banana.kame.net

IPv6 becomes visible only when you use numeric addresses
ping6 ::1
telnet ::1

Socket APIs are updated with AF_INET6 and sockaddr_in6
Basic applications are trivial
IPv6-ready resolver is in libinet6.a
Needs to be integrated into libc when KAME gets merged
Routing socket, setsockopt, and other tricky parts need update

(demo maybe)