http://www.rfc-editor.org/rfc/rfc7514.txt
RFC 7514: Really Explicit Congestion Notification (RECN), M. Luckie2015-04-01T23:00:00-00:00This document proposes a new ICMP message that a router or host may use to advise a host to reduce the rate at which it sends, in cases where the host ignores other signals provided by packet loss and Explicit Congestion Notification (ECN).