Related technologies

Proxies
Non-transparent way for connecting IPv6 hosts to IPv4 hosts

Dual stack approach
Translator boxes MUST be dual stack
Endhost behind translator can be single stack

Temporary/dynamic assignment of IPv4 address
IPv6 host (on IPv6-only net) acquires IPv4 addr dynamically, to communicate with IPv4 hosts
Dynamic tunnelling necessary to route the packet (no route for IPv4)
Avoid the need of translator box

Toolnet6: quick IPv6 support for Win95
Header converter in OS code