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I-D ACTION:draft-ietf-ipsec-ikev2-ecnfix-01.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IP Security Protocol Working Group of the IETF.

	Title		: IKEv2: ECN Requirements for IPsec Tunnels
	Author(s)	: D. Black
	Filename	: draft-ietf-ipsec-ikev2-ecnfix-01.txt
	Pages		: 7
	Date		: 2003-2-19
	
IPsec (IP Security) tunnel encapsulation and decapsulation were 
specified prior to the addition of ECN (Explicit Congestion 
Notification) to IP, with the potential result that ECN congestion 
indications could be discarded by IPsec tunnel decapsulators.  The 
current ECN specification includes two ECN operating modes for 
IPsec tunnels to avoid this situation, and IKEv1/ISAKMP (Internet 
Key Exchange/Internet Security Association and Key Management 
Protocol) negotiation extensions to enable ECN to be used correctly 
with IPsec tunnels.  To simplify this situation, IKEv2 requires 
changes to tunnel decapsulation that prevent discarding of ECN 
congestion indication, obviating the need for multiple ECN 
operating modes and associated negotiation support.

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