You're describing NAT-PT, which the IETF moved to "historic status" in 2007: https://tools.ietf.org/html/rfc4966 https://tools.ietf.org/html/rfc4966 Recent dev

You're describing NAT-PT, which the IETF moved to "historic status" in 2007: https://tools.ietf.org/html/rfc4966 https://tools.ietf.org/html/rfc4966 Recent developments like DNS over HTTPS make it even less viable.