New Transport Layer Protocols

SCTP (Stream Control Transmission Protocol)

New transport layer protocol; designed for telephony, but general-purpose.
Supported since 2.6.0.
Provides reliable, unduplicated, in-order delivery (like TCP).
Message boundaries are preserved.
Supports multiple logical streams on a single connection.
Further information:
http://www.sctp.org/
http://lksctp.sourceforge.net/ (Linux implementation)
http://tdrwww.exp-math.uni-essen.de/inhalt/forschung/sctp_fb/index.html (tutorial)
RFCs 2960, 3257, 3286, and 3309.
Programming API is described in: Stevens, Fenner, and Rudoff. 2004. UNIX Network Programming, Volume 1, (3rd ed.): The Sockets Networking API.