Internet Stream Protocol
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The Internet Stream Protocol (ST) was an experimental protocol defined in 1979 in IEN 119 (Internet Engineering Note), and was later revised in RFC 1190 (ST2) and RFC 1819 (ST2+). ST was envisioned to be the connection oriented complement to IPv4, but it has never been introduced for public usage. Many of the concepts available in ST can be found today in MPLS.
In datagram mode, ST was assigned Internet Protocol version number 5.