Datagram Congestion Control Protocol (DCCP) Simultaneous-Open Technique to Facilitate NAT/Middlebox Traversal
Gorry Fairhurst · 2009
This document specifies an update to the Datagram Congestion Control Protocol (DCCP), a connection-oriented and datagram-based transport protocol. The update adds support for the DCCP-Listen packet. This assists DCCP applications to communicate through middleboxes (e.g. a DCCP server behind a firewall, or Network Address Port Translators), where establishing necessary middlebox state requires peering endpoints to initiate communication in a near-simultaneous manner.