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1: IPv6 Rationale and Features > What Happened to IPv5?
What Happened to IPv5?
IPv5 is the IP protocol number of the Stream Protocol (ST) [RFC1190], an experimental protocol for streaming traffic. Figure 1.26 shows where ST fits in the IP architecture, including some specific streaming transport protocols named PVP and NVP.
To differentiate IPv4 packets from ST IP packets at the link layer, ST requires a specific IP version number. At the time of ST, the next version number available for IP was ‘5’. So IANA [IANA, 2001] allocated 5 to ST, so ST is also known as IPv5. When IPng was designed, the next version number available for IP was ‘6’, so IPng is IPv6.
Figure 1.26 Streaming Protocol and IPv4 Architecture
ST is an experimental protocol and is not deployed. Streaming is handled with multicast, RTP and other protocols.
