rfc9740v2.txt		rfc9740.txt
	Internet Engineering Task Force (IETF) M. Boucadair		Internet Engineering Task Force (IETF) M. Boucadair
	Request for Comments: 9740 Orange		Request for Comments: 9740 Orange
	Category: Standards Track B. Claise		Category: Standards Track B. Claise
	ISSN: 2070-1721 Huawei		ISSN: 2070-1721 Huawei
	February 2025		February 2025
	New IPFIX Information Elements for TCP Options and IPv6 Extensions		New IPFIX Information Elements for TCP Options and IPv6 Extension
	Headers		Headers
	Abstract		Abstract
	This document specifies new IP Flow Information Export (IPFIX)		This document specifies new IP Flow Information Export (IPFIX)
	Information Elements (IEs) to solve issues with existing		Information Elements (IEs) to solve issues with existing
	ipv6ExtensionHeaders and tcpOptions IPFIX IEs, especially the ability		ipv6ExtensionHeaders and tcpOptions IPFIX IEs, especially the ability
	to export any observed IPv6 extension headers or TCP options.		to export any observed IPv6 extension headers or TCP options.
	Status of This Memo		Status of This Memo
	skipping to change at line 335 ¶		skipping to change at line 335 ¶
	This IE is a subTemplateList of ipv6ExtensionHeaderType and		This IE is a subTemplateList of ipv6ExtensionHeaderType and
	ipv6ExtensionHeaderCount IEs.		ipv6ExtensionHeaderCount IEs.
	Each header chain in a Flow with varying extension header chains		Each header chain in a Flow with varying extension header chains
	MUST be exported in a separate IE.		MUST be exported in a separate IE.
	The same extension header type may appear several times in an		The same extension header type may appear several times in an
	ipv6ExtensionHeaderTypeCountList IE. For example, if an IPv6		ipv6ExtensionHeaderTypeCountList IE. For example, if an IPv6
	packet of a Flow includes a Hop-by-Hop Options header, a		packet of a Flow includes a Hop-by-Hop Options header, a
	Destination Options header, a Fragment header, and Destination		Destination Options header, a Fragment header, and a Destination
	Options header, the ipv6ExtensionHeaderTypeCountList IE will		Options header, the ipv6ExtensionHeaderTypeCountList IE will
	report:		report:
	* the count of Hop-by-Hop Options headers,		* the count of Hop-by-Hop Options headers,
	* the occurrences of the Destination Options headers that are		* the occurrences of the Destination Options headers that are
	observed before a Fragment header,		observed before a Fragment header,
	* the occurrences of the Fragment headers, and		* the occurrences of the Fragment headers, and
	skipping to change at line 505 ¶		skipping to change at line 505 ¶
	The presence of tcpSharedOptionExID16List or		The presence of tcpSharedOptionExID16List or
	tcpSharedOptionExID32List IEs is an indication that a shared TCP		tcpSharedOptionExID32List IEs is an indication that a shared TCP
	option (Kind=253 or 254) is observed in a Flow. The presence of		option (Kind=253 or 254) is observed in a Flow. The presence of
	tcpSharedOptionExID16List or tcpSharedOptionExID32List IEs takes		tcpSharedOptionExID16List or tcpSharedOptionExID32List IEs takes
	precedence over setting the corresponding bits in the		precedence over setting the corresponding bits in the
	tcpOptionsFull IE for the same Flow. In order to optimize the use		tcpOptionsFull IE for the same Flow. In order to optimize the use
	of the reduced-size encoding in the presence of		of the reduced-size encoding in the presence of
	tcpSharedOptionExID16List or tcpSharedOptionExID32List IEs, the		tcpSharedOptionExID16List or tcpSharedOptionExID32List IEs, the
	Exporter MUST NOT set to 1 the shared TCP options (Kind=253 or		Exporter MUST NOT set to 1 the shared TCP options (Kind=253 or
	254) flags of the tcpOptionsFull IE that is reported for the same		254) of the tcpOptionsFull IE that is reported for the same Flow.
	Flow.
	Abstract Data Type: unsigned256		Abstract Data Type: unsigned256
	Data Type Semantics: flags		Data Type Semantics: flags
	Additional Information: See the "TCP Option Kind Numbers" registry		Additional Information: See the "TCP Option Kind Numbers" registry
	at [IANA-TCP].		at [IANA-TCP].
	See [RFC9293] for the general definition of TCP options.		See [RFC9293] for the general definition of TCP options.
End of changes. 3 change blocks.
	4 lines changed or deleted		3 lines changed or added
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