Improving the Internet's Transport Layer

The Internet's transport layer is almost impossible to change; this is at least partially due to its lack of abstraction, which makes application designers choose protocols instead of services. I vaguely described a better approach in:

Michael Welzl: "A Case for Middleware to Enable Advanced Internet Services", Proceedings of Next Generation Network Middleware workshop (NGNM'04), co-located with Networking 2004, Athens, Greece, 14 May, 2004.

Bryan Ford and Jana Iyengar's "Breaking Up the Transport Logjam" paper provides some more details about what a better Internet transport layer could look like; however, neither my old paper nor this one (nor any other one that I know of) explains how to make the move from today's Internet to such a new, better design.

I want to make that move. For some explanations, see these slides: part 1: part 2:

In a nutshell, I think that we must first get SCTP and DCCP deployed, for which we must make it as attractive and easy as possible to use these two protocols. This page collects my efforts in this direction.

• Florian Niederbacher's master thesis has shown that significant performance gains can be attained by transparently mapping multiple TCP connections between the same host pair onto streams of a single SCTP association underneath the socket interface. An abbreviated version is:
  Michael Welzl, Florian Niederbacher, Stein Gjessing: "Beneficial Transparent Deployment of SCTP: the Missing Pieces", IEEE GlobeCom 2011, 5-9 December 2011, Houston, Texas.
  
  • It has also shown that, using default parameters, the Linux SCTP implementation will usually perform much worse than TCP. We have begun to fix this in a project called "A Better Linux SCTP", funded by the NL.Net foundation. The first outcome of this project is code for SCTP auto-buffer tuning, and the second is a (not yet 100% working) implementation of pluggable congestion control for SCTP. Also note that the Linux SCTP implementation has generally
  improved (bugfixed, ..) since Florian's thesis.
• MulTFRC could be used to make DCCP more attractive.
• Stefan Jörer's master thesis proposes a new transport API design for the Internet. An abbreviated version is:
  Michael Welzl, Stefan Jörer, Stein Gjessing: "Towards a Protocol-Independent Internet Transport API", accepted for publication, FutureNet IV workshop in conjunction with of IEEE ICC 2011, 5-9 June 2011, Kyoto, Japan.