+-------------+ +----------+ Private | lwB4 | IPv4-in-IPv6| Stateless| +------+ IPv4 |------+------| Tunnel | lwAFTR | _______ | IPv4 |------->| |Encap.|------------>|(encap/A+P| ( IPv4 ) |Device|<-------| NAPT | / |<------------|bind. tab +--( Internet ) +------+ | 44 |Decap.| ^ | routing) | (________) +------+------+ | +----------+ Operator IPv6 Network