> Also NAT is not routing The term "transparent routing" is used throughout the document to identify the routing functionality that a NAT device provides

> Also NAT is not routing The term "transparent routing" is used throughout the document to identify the routing functionality that a NAT device provides. This is different from the routing functionality provided by a traditional router device in that a traditional router routes packets within a single address realm. Transparent routing refers to routing a datagram between disparate address realms, by modifying address contents in the IP header to be valid in the address realm into which the datagram is routed. Section 3.2 has a detailed description of transparent routing. Section 2.2 https://datatracker.ietf.org/doc/html/rfc2663 https://datatracker.ietf.org/doc/html/rfc2663 NAT is still routing, even if it is different than "traditional" routing.