Automatic IPv6 Connectivity Client Utilityhttp://www.sixxs.net/tools/aiccu/
AICCU -- Automatic IPv6 Connectivity Client Utility, makes it easy for
users to get IPv6 connectivity at http://www.sixxs.net/. After having
requested an account, tunnel and optionally a subnet, AICCU can be used
to automatically configure the tunnel.
AICCU supports TIC (Tunnel Information & Control protocol), which it
uses for retrieving the tunnel configuration information, AYIYA, which
allows tunnels to be created even behind firewalls and NAT's.