A company supports IPv4 and IPv6 addresses, and they need to be able to support flow- based translations for multiple IPv6 devices to a single IPv4 address. Which address family translation design sol

Stateful NAT-PT is an older deprecated protocol superseded by NAT64, and RFC 4966 identified fundamental design flaws that make it unsuitable for new deployments.

NAT-PT was deprecated by RFC 4966 due to inherent architectural problems including DNS-ALG dependencies and is no longer recommended for any deployment.

Stateless NAT64 (RFC 6145) uses an algorithmic one-to-one mapping between IPv6 and IPv4 addresses and cannot support multiple IPv6 hosts sharing a single IPv4 address.

Stateful NAT64, defined in RFC 6146, operates like IPv4 PAT/NAPT by creating per-flow state entries that map each IPv6 source address and port to a shared IPv4 address with a unique port, allowing many-to-one translation. The stateful binding table ensures that return IPv4 traffic is correctly translated back and delivered to the originating IPv6 host. This directly satisfies the requirement for flow-based translations from multiple IPv6 devices to a single IPv4 address.