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Topic: Explicit Congestion Notification

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	RFC 3168 (rfc3168) - The Addition of Explicit Congestion Notification (ECN
		ECN as an Indication of Persistent Congestion We emphasize that a single packet with the CE codepoint set in an IP packet causes the transport layer to respond, in terms of congestion control, as it would to a packet drop.
		When ECN usage is allowed in the outer IP header, the ECT codepoint is set in the outer header for ECN-capable connections and congestion notifications (indicated by the CE codepoint) from such connections are propagated to the inner header at tunnel egress.
		The ECN nonce allows the development of mechanisms for the sender to probabilistically verify that network elements are not erasing the CE codepoint, and that data receivers are properly reporting to the sender the receipt of packets with the CE codepoint set.
	www.faqs.org /rfcs/rfc3168.html (19407 words)

	RFC 2481 (rfc2481) - A Proposal to add Explicit Congestion Notification (E
		The network's state of congestion or otherwise is determined by end- systems probing for the network state, by gradually increasing the load on the network (by increasing the window of packets that are outstanding in the network) until the network becomes congested and a packet is lost.
		Explicit Congestion Notification in IP We propose that the Internet provide a congestion indication for incipient congestion (as in RED and earlier work [RJ90]) where the notification can sometimes be through marking packets rather than dropping them.
		While ECN is inextricably tied up with active queue management at the router, the reverse does not hold; active queue management mechanisms have been developed and deployed independently from ECN, using packet drops as indications of congestion in the absence of ECN in the IP architecture.
	www.faqs.org /rfcs/rfc2481.html (8387 words)

	[No title]
		Standards Track [Page 38] RFC 3168 The Addition of ECN to IP September 2001 When ECN (Explicit Congestion Notification) is used, it is required that congestion indications generated within an IP tunnel not be lost at the tunnel egress.
		Standards Track [Page 50] RFC 3168 The Addition of ECN to IP September 2001 One consequence for the network of subverting end-to-end congestion control is that flows that do not receive the congestion indications from the network might increase their sending rate until they drive the network into heavier congestion.
		Standards Track [Page 51] RFC 3168 The Addition of ECN to IP September 2001 The threat to the network posed by the subversion of ECN-based congestion control in the network is essentially the same as the threat posed by an end-system that intentionally fails to cooperate with end-to-end congestion control.
	www.ietf.org /rfc/rfc3168.txt (19881 words)

	[No title]
		Although RED is meant to be a general mechanism using one Ramakrishnan & Floyd Experimental [Page 3] RFC 2481 ECN to IP January 1999 of several alternatives for congestion indication, in the current environment of the Internet RED is restricted to using packet drops as a mechanism for congestion indication.
		Ramakrishnan & Floyd Experimental [Page 14] RFC 2481 ECN to IP January 1999 The IPsec protocol currently requires that the inner header's ECN field not be changed by IPsec decapsulation processing at a tunnel egress node.
		In the Ramakrishnan & Floyd Experimental [Page 21] RFC 2481 ECN to IP January 1999 one-bit implementation, this means that the single overloaded bit should by default be in the "CE or not ECT" position.
	www.rfc-editor.org /rfc/rfc2481.txt (8586 words)

	Explicit Congestion Notification - Wikipedia, the free encyclopedia
		ECN is an extension to IP which allows advance notification of congestion.
		RFC 3168 - The Addition of Explicit Congestion Notification (ECN) to IP http://www.icir.org/floyd/ecn.html – Sally Floyd's ECN page
		This page was last modified 12:29, 15 July 2006.
	en.wikipedia.org /wiki/Explicit_Congestion_Notification (70 words)

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