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There's also SCTP: Stream Control Transmission Protocol (SCTP) is a transport-layer protocol, serving in a similar role to the popular protocols TCP and UDP. I

There's also SCTP: Stream Control Transmission Protocol (SCTP) is a transport-layer protocol, serving in a similar role to the popular protocols TCP and UDP. It is standardized by IETF in RFC 4960. SCTP provides some of the same service features of both: it is message-oriented like UDP and ensures reliable, in-sequence transport of messages with congestion control like TCP; it differs from these in providing multi-homing and redundant paths to increase resilience and reliability. https://en.m.wikipedia.org/wiki/Stream_Control_Transmission_Protocol https://en.m.wikipedia.org/wiki/Stream_Control_Transmission_... Edit: fix typo

voidz 10y ago
It's also (usually) routed over the Internet properly in my experience.
kosinus 10y ago
SCTP may see more usage in the wild because of WebRTC.
- unmole 10y ago
  WebRTC does not use real SCTP but a rather a tunnel over UDP. Besides, it's not like WebRTC accounts for a significant amount of Internet traffic. I'd say SCTP sees more usage simply because it has been around for much longer with SS7 being the primary use case.
  - atlas1j 10y ago
    There is a standards track RFC that defines SCTP over UDP. RFC 6951 "UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets for End-Host to End-Host Communication".
    - unmole 10y ago
      Sure. But it's still not real SCTP if the IP header's Protocol field doesn't say 0x84 :D
ycmbntrthrwaway 10y ago
Also QUIC, which got most of its ideas from SCTP and some from DCCP.
epx 10y ago
SCTP really really deserved to be widely deployed.
nickpsecurity 10y ago
And UDT which was winning awards for performance on supercomputers since around 2007: http://udt.sourceforge.net/ http://udt.sourceforge.net/
IgorPartola 10y ago
HTTP should have made SCTP a lot more popular. SCTP is a natural fit for reliably transporting static files, which is what HTTP was originally designed for. So many of the HTTP2/SPDY/etc. features are there to make up for the fact that TCP doesn't have a length "field" since it's stream-oriented. Obviously, there are exceptions and you can have both streams and known-length content served over HTTP, but I still think streams over SCTP would have been a better choice than datagrams over TCP. Edit: Also firewalls that filter out anything but TCP (or TCP + UDP, or TCP + UDP + ICMP) can die a fiery death. The fact that basically any new protocol has to tunnel over UDP instead of properly over IP is heresy and bullshit.

voidz 10y ago

It's also (usually) routed over the Internet properly in my experience.

kosinus 10y ago

SCTP may see more usage in the wild because of WebRTC.

unmole 10y ago
WebRTC does not use real SCTP but a rather a tunnel over UDP. Besides, it's not like WebRTC accounts for a significant amount of Internet traffic. I'd say SCTP sees more usage simply because it has been around for much longer with SS7 being the primary use case.
- atlas1j 10y ago
  There is a standards track RFC that defines SCTP over UDP. RFC 6951 "UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets for End-Host to End-Host Communication".
  - unmole 10y ago
    Sure. But it's still not real SCTP if the IP header's Protocol field doesn't say 0x84 :D

ycmbntrthrwaway 10y ago

Also QUIC, which got most of its ideas from SCTP and some from DCCP.

epx 10y ago

SCTP really really deserved to be widely deployed.

nickpsecurity 10y ago

And UDT which was winning awards for performance on supercomputers since around 2007: http://udt.sourceforge.net/ http://udt.sourceforge.net/

IgorPartola 10y ago

HTTP should have made SCTP a lot more popular. SCTP is a natural fit for reliably transporting static files, which is what HTTP was originally designed for. So many of the HTTP2/SPDY/etc. features are there to make up for the fact that TCP doesn't have a length "field" since it's stream-oriented. Obviously, there are exceptions and you can have both streams and known-length content served over HTTP, but I still think streams over SCTP would have been a better choice than datagrams over TCP. Edit: Also firewalls that filter out anything but TCP (or TCP + UDP, or TCP + UDP + ICMP) can die a fiery death. The fact that basically any new protocol has to tunnel over UDP instead of properly over IP is heresy and bullshit.