New Transport Layer Protocols

DCCP (Datagram Congestion Control Protocol)

New transport layer protocol.
Linux 2.6.14.
DCCP provides congestion control so that fast sender does not overwhelm a network (like TCP).
DCCP does not guarantee reliable or in-order delivery (like UDP, unlike TCP).
Some applications need congestion control, but not the other overhead required to provide TCP's reliability guarantees.
E.g., streaming media.
Further information:
http://www.icir.org/kohler/dcp/

Linux gets DCCP (Jonathan Corbet, LWN.net, 1 Sep 2005), http://lwn.net/Articles/149756/

See also Ian McDonald's presentation Recent congestion control advancements in Linux at lca2006 (10:55-11:45, Thursday, Burns 2)