rfc9648.original		rfc9648.txt
	TCPM M. Scharf		Internet Engineering Task Force (IETF) M. Scharf
	Internet-Draft Hochschule Esslingen		Request for Comments: 9648 Hochschule Esslingen
	Intended status: Standards Track M. Jethanandani		Category: Standards Track M. Jethanandani
	Expires: 15 March 2023 Kloud Services		ISSN: 2070-1721 Kloud Services
	V. Murgai		V. Murgai
	Samsung		F5, Inc.
	11 September 2022		September 2024
	A YANG Model for Transmission Control Protocol (TCP) Configuration and		YANG Data Model for TCP
	State
	draft-ietf-tcpm-yang-tcp-09
	Abstract		Abstract
	This document specifies a minimal YANG model for TCP on devices that		This document specifies a minimal YANG data model for TCP on devices
	are configured and managed by network management protocols. The YANG		that are configured and managed by network management protocols. The
	model defines a container for all TCP connections, and groupings of		YANG data model defines a container for all TCP connections and
	authentication parameters that can be imported and used in TCP		groupings of authentication parameters that can be imported and used
	implementations or by other models that need to configure TCP		in TCP implementations or by other models that need to configure TCP
	parameters. The model also includes basic TCP statistics. The model		parameters. The model also includes basic TCP statistics. The model
	is compliant with Network Management Datastore Architecture (NMDA)		is compliant with Network Management Datastore Architecture (NMDA)
	(RFC 8342).		(RFC 8342).
	Status of This Memo		Status of This Memo
	This Internet-Draft is submitted in full conformance with the		This is an Internet Standards Track document.
	provisions of BCP 78 and BCP 79.
	Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-
	Drafts is at https://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		This document is a product of the Internet Engineering Task Force
	and may be updated, replaced, or obsoleted by other documents at any		(IETF). It represents the consensus of the IETF community. It has
	time. It is inappropriate to use Internet-Drafts as reference		received public review and has been approved for publication by the
	material or to cite them other than as "work in progress."		Internet Engineering Steering Group (IESG). Further information on
			Internet Standards is available in Section 2 of RFC 7841.
	This Internet-Draft will expire on 15 March 2023.		Information about the current status of this document, any errata,
			and how to provide feedback on it may be obtained at
			https://www.rfc-editor.org/info/rfc9648.
	Copyright Notice		Copyright Notice
	Copyright (c) 2022 IETF Trust and the persons identified as the		Copyright (c) 2024 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents (https://trustee.ietf.org/		Provisions Relating to IETF Documents
	license-info) in effect on the date of publication of this document.		(https://trustee.ietf.org/license-info) in effect on the date of
	Please review these documents carefully, as they describe your rights		publication of this document. Please review these documents
	and restrictions with respect to this document. Code Components		carefully, as they describe your rights and restrictions with respect
	extracted from this document must include Revised BSD License text as		to this document. Code Components extracted from this document must
	described in Section 4.e of the Trust Legal Provisions and are		include Revised BSD License text as described in Section 4.e of the
	provided without warranty as described in the Revised BSD License.		Trust Legal Provisions and are provided without warranty as described
			in the Revised BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2		1. Introduction
	2. Requirements Language . . . . . . . . . . . . . . . . . . . . 4		1.1. Conventions
	2.1. Note to RFC Editor . . . . . . . . . . . . . . . . . . . 4		2. Requirements Language
	3. YANG Module Overview . . . . . . . . . . . . . . . . . . . . 4		3. YANG Module Overview
	3.1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 4		3.1. Scope
	3.2. Model Design . . . . . . . . . . . . . . . . . . . . . . 6		3.2. Model Design
	3.3. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 6		3.3. Tree Diagram
	4. TCP YANG Model . . . . . . . . . . . . . . . . . . . . . . . 7		4. TCP YANG Data Model
	5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19		5. IANA Considerations
	5.1. The IETF XML Registry . . . . . . . . . . . . . . . . . . 19		5.1. The IETF XML Registry
	5.2. The YANG Module Names Registry . . . . . . . . . . . . . 20		5.2. The YANG Module Names Registry
	6. Security Considerations . . . . . . . . . . . . . . . . . . . 20		6. Security Considerations
	7. References . . . . . . . . . . . . . . . . . . . . . . . . . 21		7. References
	7.1. Normative References . . . . . . . . . . . . . . . . . . 21		7.1. Normative References
	7.2. Informative References . . . . . . . . . . . . . . . . . 23		7.2. Informative References
	Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 25		Appendix A. Examples
	Appendix B. Examples . . . . . . . . . . . . . . . . . . . . . . 25		A.1. Keepalive Configuration
	B.1. Keepalive Configuration . . . . . . . . . . . . . . . . . 26		A.2. TCP-AO Configuration
	B.2. TCP-AO Configuration . . . . . . . . . . . . . . . . . . 26		Appendix B. Complete Tree Diagram
	Appendix C. Complete Tree Diagram . . . . . . . . . . . . . . . 28		Acknowledgements
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 29		Authors' Addresses
	1. Introduction		1. Introduction
	The Transmission Control Protocol (TCP) [RFC9293] is used by many		The Transmission Control Protocol (TCP) [RFC9293] is used by many
	applications in the Internet, including control and management		applications in the Internet, including control and management
	protocols. As such, TCP is implemented on network elements that can		protocols. As such, TCP is implemented on network elements that can
	be configured and managed via network management protocols such as		be configured and managed via network management protocols such as
	NETCONF [RFC6241] or RESTCONF [RFC8040].		Network Configuration Protocol (NETCONF) [RFC6241] or RESTCONF
			[RFC8040].
	This document specifies a minimal YANG 1.1 [RFC7950] model for		This document specifies a minimal YANG 1.1 [RFC7950] data model for
	configuring and managing TCP on network elements that support YANG, a		configuring and managing TCP on network elements that support YANG, a
	TCP connection table, a TCP listener table containing information		TCP connection table, a TCP listener table containing information
	about a particular TCP listener, and an augmentation of the YANG Data		about a particular TCP listener, and an augmentation of the YANG data
	Model for Key Chains [RFC8177] to support authentication. The YANG		model for key chains [RFC8177] to support authentication. The YANG
	module specified in this document is compliant with Network		module specified in this document is compliant with Network
	Management Datastore Architecture (NMDA) [RFC8342].		Management Datastore Architecture (NMDA) [RFC8342].
	The YANG module has a narrow scope and focuses on a subset of		The YANG module has a narrow scope and focuses on a subset of
	fundamental TCP functions and basic statistics. It defines a		fundamental TCP functions and basic statistics. It defines a
	container for a list of TCP connections that includes definitions		container for a list of TCP connections that includes definitions
	from YANG Groupings for TCP Clients and TCP Servers		from "YANG Groupings for TCP Clients and TCP Servers" [RFC9643]. The
	[I-D.ietf-netconf-tcp-client-server]. The model adheres to the		model adheres to the recommendation in "BGP/MPLS IP Virtual Private
	recommendation in BGP/MPLS IP Virtual Private Networks [RFC4364].		Networks (VPNs)" [RFC4364]. Therefore, it allows enabling of TCP
	Therefore it allows enabling of TCP-AO [RFC5925], and accommodates		Authentication Option (TCP-AO) [RFC5925] and accommodates the
	the installed base that makes use of MD5. The module can be		installed base that makes use of MD5. The module can be augmented or
	augmented or updated to address more advanced or implementation-		updated to address more advanced or implementation-specific TCP
	specific TCP features in the future.		features in the future.
	This specification does not deprecate the Management Information Base		This specification does not deprecate the Management Information Base
	(MIB) for the Transmission Control Protocol (TCP) [RFC4022]. The		(MIB) for the Transmission Control Protocol (TCP) [RFC4022]. The
	basic statistics defined in this document follow the model of the TCP		basic statistics defined in this document follow the model of the TCP
	MIB. An TCP Extended Statistics MIB [RFC4898] is also available, but		MIB. A TCP extended statistics MIB [RFC4898] is also available, but
	this document does not cover such extended statistics. The YANG		this document does not cover such extended statistics. The YANG
	module also omits some selected parameters included in TCP MIB, most		module also omits some selected parameters included in TCP MIB, most
	notably Retransmission Timeout (RTO) configuration and a maximum		notably Retransmission Timeout (RTO) configuration and a maximum
	connection limit. This is a conscious decision as these parameters		connection limit. This is a conscious decision as these parameters
	hardly matter in a state-of-the-art TCP implementation. It would		hardly matter in a state-of-the-art TCP implementation. It would
	also be possible to translate a MIB into a YANG module, for instance		also be possible to translate a MIB into a YANG module, for instance,
	using Translation of Structure of Management Information Version 2		using "Translation of Structure of Management Information Version 2
	(SMIv2) MIB Modules to YANG Modules [RFC6643]. However, this		(SMIv2) MIB Modules to YANG Modules" [RFC6643]. However, this
	approach is not used in this document, because a translated model		approach is not used in this document, because a translated model
	would not be up-to-date.		would not be up-to-date.
	There are other existing TCP-related YANG models, which are		There are other existing TCP-related YANG data models, which are
	orthogonal to this specification. Examples are:		orthogonal to this specification. Examples are:
	* TCP header attributes are modeled in other security-related		* TCP header attributes are modeled in other security-related
	models, such as YANG Data Model for Network Access Control Lists		models, such as those described in "YANG Data Model for Network
	(ACLs) [RFC8519], Distributed Denial-of-Service Open Thread		Access Control Lists (ACLs)" [RFC8519], "Distributed Denial-of-
	Signaling (DOTS) Data Channel Specification [RFC8783], I2NSF		Service Open Threat Signaling (DOTS) Data Channel Specification"
	Capability YANG Data Model [I-D.ietf-i2nsf-capability-data-model],		[RFC8783], "I2NSF Capability YANG Data Model" [NSF-CAP-YANG], or
	or I2NSF Network Security Function-Facing Interface YANG Data		"I2NSF Network Security Function-Facing Interface YANG Data Model"
	Model [I-D.ietf-i2nsf-nsf-facing-interface-dm].		[NSF-FACING-YANG].
	* TCP-related configuration of a NAT (e.g., NAT44, NAT64,		* TCP-related configuration of a NAT (e.g., NAT44, NAT64, or
	Destination NAT) is defined in A YANG Module for Network Address		Destination NAT) is defined in "A YANG Module for Network Address
	Translation (NAT) and Network Prefix Translation (NPT) [RFC8512]		Translation (NAT) and Network Prefix Translation (NPT)" [RFC8512]
	and A YANG Data Model for Dual-Stack Lite (DS-Lite) [RFC8513].		and "A YANG Data Model for Dual-Stack Lite (DS-Lite)" [RFC8513].
	* TCP-AO and TCP MD5 configuration for Layer 3 VPNs is modeled in A		* TCP-AO and TCP MD5 configuration for Layer 3 VPNs is modeled in "A
	Layer 3 VPN Network YANG Model [RFC9182]. This model assumes that		YANG Network Data Model for Layer 3 VPNs" [RFC9182]. This model
	TCP-AO specific parameters are preconfigured in addition to the		assumes that TCP-AO-specific parameters are preconfigured in
	keychain parameters.		addition to the key chain parameters.
			1.1. Conventions
			Various examples in this document use the XML [W3C.REC-xml-20081126]
			encoding. Other encodings, such as JSON [RFC8259], could
			alternatively be used.
			Various examples in this document contain long lines that may be
			folded, as described in [RFC8792].
	2. Requirements Language		2. Requirements Language
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and		"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
	"OPTIONAL" in this document are to be interpreted as described in BCP		"OPTIONAL" in this document are to be interpreted as described in
	14 [RFC2119] [RFC8174] when, and only when, they appear in all		BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
	capitals, as shown here.		capitals, as shown here.
	2.1. Note to RFC Editor
	This document uses several placeholder values throughout the
	document. Please replace them as follows and remove this note before
	publication.
	RFC XXXX, where XXXX is the number assigned to this document at the
	time of publication.
	2022-09-11 with the actual date of the publication of this document.
	3. YANG Module Overview		3. YANG Module Overview
	3.1. Scope		3.1. Scope
	TCP is implemented on different system architectures. As a result,		TCP is implemented on different system architectures. As a result,
	there are many different and often implementation-specific ways to		there are many different and often implementation-specific ways to
	configure parameters of the TCP engine. In addition, in many TCP/IP		configure parameters of the TCP engine. In addition, in many TCP/IP
	stacks configuration exists for different scopes:		stacks, configuration exists for different scopes:
	* System-wide configuration: Many TCP implementations have		* System-wide configuration: Many TCP implementations have
	configuration parameters that affect all TCP connections from or		configuration parameters that affect all TCP connections from or
	to this TCP stack. Typical examples include enabling or disabling		to this TCP stack. Typical examples include enabling or disabling
	optional protocol features. For instance, many implementations		optional protocol features. For instance, many implementations
	can turn on or off use of window scaling Transmission Control		can turn on or off use of window scaling (defined in "Transmission
	Protocol (TCP) Specification [RFC9293] for all TCP connections.		Control Protocol (TCP)" [RFC9293]) for all TCP connections.
	* Interface configuration: It can be useful to use different TCP		* Interface configuration: It can be useful to use different TCP
	parameters on different interfaces, e.g., different device ports		parameters on different interfaces, e.g., different device ports
	or IP interfaces. In that case, TCP parameters can be part of the		or IP interfaces. In that case, TCP parameters can be part of the
	interface configuration. Typical examples are the Maximum Segment		interface configuration. Typical examples are the Maximum Segment
	Size (MSS) or configuration related to hardware offloading.		Size (MSS) or configuration related to hardware offloading.
	* Connection parameters: Many implementations have means to		* Connection parameters: Many implementations have means to
	influence the behavior of each TCP connection, e.g., on the		influence the behavior of each TCP connection, e.g., on the
	programming interface used by applications. Typical examples are		programming interface used by applications. Typical examples are
	socket options in the socket API, such as disabling the Nagle		socket options in the socket API, such as disabling the Nagle
	algorithm Transmission Control Protocol (TCP) Specification		algorithm (as described in "Transmission Control Protocol (TCP)"
	[RFC9293] by TCP_NODELAY. If an application uses such an		[RFC9293]) by TCP_NODELAY. If an application uses such an
	interface, it is possible that the configuration of the		interface, it is possible that the configuration of the
	application or application protocol includes TCP-related		application or application protocol includes TCP-related
	parameters. An example is the BGP YANG Model for Service Provider		parameters. An example is the BGP YANG module for service
	Networks [I-D.ietf-idr-bgp-model].		provider networks [BGP-MODEL].
	* Application preferences: Setting of TCP parameters can also be		* Application preferences: Setting of TCP parameters can also be
	part of application preferences, templates, or profiles. An		part of application preferences, templates, or profiles. An
	example would be the preferences defined in An Abstract		example would be the preferences defined in "An Abstract
	Application Layer Interface to Transport Services		Application Layer Interface to Transport Services"
	[I-D.ietf-taps-interface].		[TAPS-INTERFACE].
	As a result, there is no ground truth for setting certain TCP		As a result, there is no ground truth for setting certain TCP
	parameters, and traditionally different TCP implementations have used		parameters, and generally different TCP implementations have used
	different modeling approaches. For instance, one implementation may		different modeling approaches. For instance, one implementation may
	define a given configuration parameter globally, while another one		define a given configuration parameter globally, while another one
	uses per-interface settings, and both approaches work well for the		uses per-interface settings, and both approaches work well for the
	corresponding use cases. Also, different systems may use different		corresponding use cases. Also, different systems may use different
	default values. In addition, TCP can be implemented in different		default values. In addition, TCP can be implemented in different
	ways and design choices by the protocol engine often affect		ways and design choices by the protocol engine often affect
	configuration options.		configuration options.
	Nonetheless, a number of TCP stack parameters require configuration		Nonetheless, a number of TCP stack parameters require configuration
	by YANG models. This document therefore defines a minimal YANG model		by YANG data models. This document therefore defines a minimal YANG
	with fundamental parameters. An important use case is the TCP		data model with fundamental parameters. An important use case is the
	configuration on network elements such as routers, which often use		TCP configuration on network elements, such as routers, which often
	YANG data models. The model therefore specifies TCP parameters that		use YANG data models. The model therefore specifies TCP parameters
	are important on such TCP stacks.		that are important on such TCP stacks.
	This in particular applies to the support of TCP-AO [RFC5925] and the		In particular, this applies to the support of the TCP Authentication
	corresponding cryptographic algorithms [RFC5926]. TCP Authentication		Option (TCP-AO) [RFC5925] and the corresponding cryptographic
	Option (TCP-AO) is used on routers to secure routing protocols such		algorithms [RFC5926]. TCP-AO is used on routers to secure routing
	as BGP. In that case, a YANG model for TCP-AO configuration is		protocols such as BGP. In that case, a YANG data model for TCP-AO
	required. The model defined in this document includes the required		configuration is required. The model defined in this document
	parameters for TCP-AO configuration, such as the values of SendID and		includes the required parameters for TCP-AO configuration, such as
	RecvID. The keychain for TCP-AO can be modeled by the YANG Data		the values of SendID and RecvID. The key chain for TCP-AO can be
	Model for Key Chains [RFC8177]. The groupings defined in this		modeled by the YANG data model for key chains [RFC8177]. The
	document can be imported and used as part of such a preconfiguration.		groupings defined in this document can be imported and used as part
			of such a preconfiguration.
	Given an installed base, the model also allows enabling of the legacy		Given an installed base, the model also allows enabling of the legacy
	TCP MD5 [RFC2385] signature option. The TCP MD5 signature option was		TCP MD5 [RFC2385] signature option. The TCP MD5 signature option was
	obsoleted by TCP-AO in 2010. If current implementations require TCP		obsoleted by TCP-AO in 2010. If current implementations require TCP
	authentication, it is RECOMMENDED to use TCP-AO [RFC5925].		authentication, it is RECOMMENDED to use TCP-AO [RFC5925].
	Similar to the TCP MIB [RFC4022], this document also specifies basic		Similar to the TCP MIB [RFC4022], this document also specifies basic
	statistics, a TCP connection list, and a TCP listener list.		statistics, a TCP connection list, and a TCP listener list.
	* Statistics: Counters for the number of active/passive opens, sent		* Statistics: Counters for the number of active/passive opens, sent
	and received TCP segments, errors, and possibly other detailed		and received TCP segments, errors, and possibly other detailed
	debugging information		debugging information.
	* TCP connection list: Access to status information for all TCP		* TCP connection list: Access to status information for all TCP
	connections. Note, the connection table is modeled as a list that		connections. Note that the connection table is modeled as a list
	is read-writeable, even though a connection cannot be created by		that is readable and writeable, even though a connection cannot be
	adding entries to the table. Similarly, deletion of connections		created by adding entries to the table. Similarly, deletion of
	from this list is implementation-specific.		connections from this list is implementation-specific.
	* TCP listener list: A list containing information about TCP		* TCP listener list: A list containing information about TCP
	listeners, i.e., applications willing to accept connections.		listeners, i.e., applications willing to accept connections.
	This allows implementations of TCP MIB [RFC4022] to migrate to the		This allows implementations of TCP MIB [RFC4022] to migrate to the
	YANG model defined in this memo. Note that the TCP MIB does not		YANG data model defined in this memo. Note that the TCP MIB does not
	include means to reset statistics, which are defined in this		include means to reset statistics, which are defined in this
	document. This is not a major addition, as a reset can simply be		document. This is not a major addition, as a reset can simply be
	implemented by storing offset values for the counters.		implemented by storing offset values for the counters.
	This version of the module does not model details of Multipath TCP		This version of the module does not model details of Multipath TCP
	[RFC8684]. This could be addressed in a later version of this		[RFC8684]. This could be addressed in a later version of this
	document.		document.
	3.2. Model Design		3.2. Model Design
	The YANG model defined in this document includes definitions from the		The YANG data model defined in this document includes definitions
	YANG Groupings for TCP Clients and TCP Servers		from "YANG Groupings for TCP Clients and TCP Servers" [RFC9643].
	[I-D.ietf-netconf-tcp-client-server]. Similar to that model, this		Similar to that model, this specification defines YANG groupings.
	specification defines YANG groupings. This allows reuse of these		This allows reuse of these groupings in different YANG data models.
	groupings in different YANG data models. It is intended that these		It is intended that these groupings will be used either standalone or
	groupings will be used either standalone or for TCP-based protocols		for TCP-based protocols as part of a stack of protocol-specific
	as part of a stack of protocol-specific configuration models. An		configuration models. An example could be the one described in "YANG
	example could be the BGP YANG Model for Service Provider Networks		Model for Border Gateway Protocol (BGP-4)" [BGP-MODEL].
	[I-D.ietf-idr-bgp-model].
	3.3. Tree Diagram		3.3. Tree Diagram
	This section provides an abridged tree diagram for the YANG module		This section provides an abridged tree diagram for the YANG module
	defined in this document. Annotations used in the diagram are		defined in this document. Annotations used in the diagram are
	defined in YANG Tree Diagrams [RFC8340]. A complete tree diagram can		defined in "YANG Tree Diagrams" [RFC8340]. A complete tree diagram
	be found in the Appendix.		can be found in Appendix B.
	module: ietf-tcp		module: ietf-tcp
	+--rw tcp!		+--rw tcp!
	+--rw connections		+--rw connections
	| ...		| ...
	+--ro tcp-listeners* [type address port]		+--ro tcp-listeners* [type address port]
	| ...		| ...
	+--ro statistics {statistics}?		+--ro statistics {statistics}?
	...		...
	augment /key-chain:key-chains/key-chain:key-chain/key-chain:key:		augment /key-chain:key-chains/key-chain:key-chain/key-chain:key:
	+--rw authentication {authentication}?		+--rw authentication {authentication}?
	+--rw keychain? key-chain:key-chain-ref		+--rw keychain? key-chain:key-chain-ref
	+--rw (authentication)?		+--rw (authentication)?
	...		...
	4. TCP YANG Model		4. TCP YANG Data Model
	This YANG module references The TCP Authentication Option [RFC5925],		This YANG module references "The TCP Authentication Option"
	Protection of BGP Sessions via the TCP MD5 Signature [RFC2385],		[RFC5925], "Protection of BGP Sessions via the TCP MD5 Signature
	Transmission Control Protocol (TCP) Specification [RFC9293], and		Option" [RFC2385], and "Transmission Control Protocol (TCP)"
	imports Common YANG Data Types [RFC6991], The NETCONF Access Control		[RFC9293] and imports "Common YANG Data Types" [RFC6991], "Network
	Model [RFC8341], and YANG Groupings for TCP Clients and TCP Servers		Configuration Access Control Model" [RFC8341], and "YANG Groupings
	[I-D.ietf-netconf-tcp-client-server].		for TCP Clients and TCP Servers" [RFC9643].
	<CODE BEGINS> file "ietf-tcp@2022-09-11.yang"		<CODE BEGINS> file "ietf-tcp@2022-09-11.yang"
	module ietf-tcp {		module ietf-tcp {
	yang-version "1.1";		yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-tcp";		namespace "urn:ietf:params:xml:ns:yang:ietf-tcp";
	prefix "tcp";		prefix tcp;
	import ietf-yang-types {		import ietf-yang-types {
	prefix "yang";		prefix yang;
	reference		reference
	"RFC 6991: Common YANG Data Types.";		"RFC 6991: Common YANG Data Types.";
	}		}
	import ietf-tcp-common {		import ietf-tcp-common {
	prefix "tcpcmn";		prefix tcpcmn;
	reference		reference
	"I-D.ietf-netconf-tcp-client-server: YANG Groupings for TCP		"RFC 9643: YANG Groupings for TCP Clients and TCP Servers.";
	Clients and TCP Servers.";
	}		}
	import ietf-inet-types {		import ietf-inet-types {
	prefix "inet";		prefix inet;
	reference		reference
	"RFC 6991: Common YANG Data Types.";		"RFC 6991: Common YANG Data Types.";
	}		}
	import ietf-netconf-acm {		import ietf-netconf-acm {
	prefix nacm;		prefix nacm;
	reference		reference
	"RFC 8341: Network Configuration Access Control Model";		"RFC 8341: Network Configuration Access Control Model.";
	}		}
	import ietf-key-chain {		import ietf-key-chain {
	prefix key-chain;		prefix key-chain;
	reference		reference
	"RFC 8177: YANG Key Chain.";		"RFC 8177: YANG Data Model for Key Chains.";
	}		}
	organization		organization
	"IETF TCPM Working Group";		"IETF TCPM Working Group";
	contact		contact
	"WG Web: <https://datatracker.ietf.org/wg/tcpm/about>		"WG Web: https://datatracker.ietf.org/wg/tcpm/about
	WG List: <tcpm@ietf.org>		WG List: TCPM WG <tcpm@ietf.org>
	Authors: Michael Scharf (michael.scharf at hs-esslingen dot de)		Authors: Michael Scharf <michael.scharf@hs-esslingen.de>
	Mahesh Jethanandani (mjethanandani at gmail dot com)		Mahesh Jethanandani <mjethanandani@gmail.com>
	Vishal Murgai (vmurgai at gmail dot com)";		Vishal Murgai <vmurgai@gmail.com>";
	description		description
	"This module focuses on fundamental TCP functions and basic		"This module focuses on fundamental TCP functions and basic
	statistics. The model can be augmented to address more advanced		statistics. The model can be augmented to address more advanced
	or implementation specific TCP features.		or implementation-specific TCP features.
	Copyright (c) 2022 IETF Trust and the persons identified as		The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
			NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
			'MAY', and 'OPTIONAL' in this document are to be interpreted as
			described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
			they appear in all capitals, as shown here.
			Copyright (c) 2024 IETF Trust and the persons identified as
	authors of the code. All rights reserved.		authors of the code. All rights reserved.
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject to		without modification, is permitted pursuant to, and subject to
	the license terms contained in, the Simplified BSD License set		the license terms contained in, the Revised BSD License set
	forth in Section 4.c of the IETF Trust's Legal Provisions		forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX		This version of this YANG module is part of RFC 9648
	(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself		(https://www.rfc-editor.org/info/rfc9648); see the RFC itself
	for full legal notices.		for full legal notices.";
	The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
	NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
	'MAY', and 'OPTIONAL' in this document are to be interpreted as
	described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
	they appear in all capitals, as shown here.";
	revision "2022-09-11" {		revision 2022-09-11 {
	description		description
	"Initial Version";		"Initial version.";
	reference		reference
	"RFC XXXX, A YANG Model for Transmission Control Protocol (TCP)		"RFC 9648: YANG Data Model for TCP.";
	Configuration and State.";
	}		}
	// Typedefs		// Typedefs
	typedef mss {		typedef mss {
	type uint16;		type uint16;
	description		description
	"Type definition for Maximum Segment Size.";		"Type definition for the Maximum Segment Size.";
	}		}
	// Features		// Features
	feature statistics {		feature statistics {
	description		description
	"This implementation supports statistics reporting.";		"This implementation supports statistics reporting.";
	}		}
	feature authentication {		feature authentication {
	description		description
	"This implementation supports authentication.";		"This implementation supports authentication.";
	}		}
	// Identities		// Identities
	identity aes-128 {		identity aes-128 {
	base key-chain:crypto-algorithm;		base key-chain:crypto-algorithm;
	description		description
	"AES128 authentication algorithm used by TCP-AO.";		"AES128 authentication algorithm used by TCP-AO.";
	reference		reference
	"RFC 5926: Cryptographic Algorithms for the TCP		"RFC 5926: Cryptographic Algorithms for the TCP
	Authentication Option (TCP-AO).";		Authentication Option (TCP-AO).";
	}		}
	// TCP-AO Groupings		// TCP-AO Groupings
	grouping ao {		grouping ao {
	leaf send-id {		leaf send-id {
	type uint8 {		type uint8 {
	range "0..max";		range "0..max";
	}		}
	description		description
	"The SendID is inserted as the KeyID of the TCP-AO option		"The SendID is inserted as the KeyID of the TCP-AO option
	of outgoing segments. In a consistent configuration, the		of outgoing segments. In a consistent configuration, the
	SendID matches the RecvID at the other endpoint.";		SendID matches the RecvID at the other endpoint.";
	reference		reference
	"RFC 5925: The TCP Authentication Option, Section 3.1.";		"RFC 5925: The TCP Authentication Option, Section 3.1.";
	}		}
	leaf recv-id {		leaf recv-id {
	type uint8 {		type uint8 {
	range "0..max";		range "0..max";
	}		}
	description		description
	"The RecvID is matched against the TCP-AO KeyID of incoming		"The RecvID is matched against the TCP-AO KeyID of incoming
	segments. In a consistent configuration, the RecvID matches		segments. In a consistent configuration, the RecvID matches
	the SendID at the other endpoint.";		the SendID at the other endpoint.";
	reference		reference
	"RFC 5925: The TCP Authentication Option, Section 3.1.";		"RFC 5925: The TCP Authentication Option, Section 3.1.";
	}		}
	leaf include-tcp-options {		leaf include-tcp-options {
	type boolean;		type boolean;
	default true;		default "true";
	description		description
	"When set to true, TCP options are included in MAC		"When set to true, TCP options are included in the message
	calculation.";		authentication code (MAC) calculation.";
	reference		reference
	"RFC 5925: The TCP Authentication Option, Section 3.1.";		"RFC 5925: The TCP Authentication Option, Section 3.1.";
	}		}
	leaf accept-key-mismatch {		leaf accept-key-mismatch {
	type boolean;		type boolean;
	description		description
	"Accept, when set to true, TCP segments with a Master Key		"Accept, when set to true, TCP segments with a Master Key
	Tuple (MKT) that is not configured.";		Tuple (MKT) that is not configured.";
	reference		reference
	skipping to change at page 11, line 4 ¶		skipping to change at line 462 ¶
	i.e., the desired 'receive next' key ID.";		i.e., the desired 'receive next' key ID.";
	reference		reference
	"RFC 5925: The TCP Authentication Option.";		"RFC 5925: The TCP Authentication Option.";
	}		}
	description		description
	"Authentication Option (AO) for TCP.";		"Authentication Option (AO) for TCP.";
	reference		reference
	"RFC 5925: The TCP Authentication Option.";		"RFC 5925: The TCP Authentication Option.";
	}		}
	// TCP configuration		// TCP configuration
	container tcp {		container tcp {
	presence "The container for TCP configuration.";		presence "The container for TCP configuration.";
	description		description
	"TCP container.";		"TCP container.";
	container connections {		container connections {
	list connection {		list connection {
	key "local-address remote-address local-port remote-port";		key "local-address remote-address local-port remote-port";
	leaf local-address {		leaf local-address {
	type inet:ip-address;		type inet:ip-address;
	description		description
	"Identifies the address that is used by the local		"Identifies the address that is used by the local
	endpoint for the connection, and is one of the four		endpoint for the connection and is one of the four
	elements that form the connection identifier.";		elements that form the connection identifier.";
	}		}
	leaf remote-address {		leaf remote-address {
	type inet:ip-address;		type inet:ip-address;
	description		description
	"Identifies the address that is used by the remote		"Identifies the address that is used by the remote
	endpoint for the connection, and is one of the four		endpoint for the connection and is one of the four
	elements that form the connection identifier.";		elements that form the connection identifier.";
	}		}
	leaf local-port {		leaf local-port {
	type inet:port-number;		type inet:port-number;
	description		description
	"Identifies the local TCP port used for the connection,		"Identifies the local TCP port used for the connection
	and is one of the four elements that form the		and is one of the four elements that form the
	connection identifier.";		connection identifier.";
	}		}
	leaf remote-port {		leaf remote-port {
	type inet:port-number;		type inet:port-number;
	description		description
	"Identifies the remote TCP port used for the connection,		"Identifies the remote TCP port used for the connection
	and is one of the four elements that form the		and is one of the four elements that form the
	connection identifier.";		connection identifier.";
	}		}
	leaf mss {		leaf mss {
	type mss;		type mss;
	description		description
	"Maximum Segment Size (MSS) desired on this connection.		"Maximum Segment Size (MSS) desired on this connection.
			Note that the 'effective send MSS' can be smaller than
	Note, the 'effective send MSS' can be smaller than
	what is configured here.";		what is configured here.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf pmtud {		leaf pmtud {
	type boolean;		type boolean;
	default false;		default "false";
	description		description
	"Turns Path Maximum Transmission Unit Discovery (PMTUD)		"Turns Path Maximum Transmission Unit Discovery (PMTUD)
	on (true) or off (false).";		on (true) or off (false).";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	uses tcpcmn:tcp-common-grouping;		uses tcpcmn:tcp-common-grouping;
	leaf state {		leaf state {
	type enumeration {		type enumeration {
	enum closed {		enum closed {
	value 1;		value 1;
	description		description
	"Connection is closed. Connections in this state		"Connection is closed. Connections in this state
	skipping to change at page 13, line 6 ¶		skipping to change at line 559 ¶
	enum syn-received {		enum syn-received {
	value 4;		value 4;
	description		description
	"Represents waiting for a confirming connection		"Represents waiting for a confirming connection
	request acknowledgment after having both received		request acknowledgment after having both received
	and sent a connection request.";		and sent a connection request.";
	}		}
	enum established {		enum established {
	value 5;		value 5;
	description		description
	"Represents an open connection, data received can be		"Represents an open connection; data received can be
	delivered to the user. The normal state for the data		delivered to the user. The normal state for the
	transfer phase of the connection.";		data transfer phase of the connection.";
	}		}
	enum fin-wait-1 {		enum fin-wait-1 {
	value 6;		value 6;
	description		description
	"Represents waiting for a connection termination		"Represents waiting for a connection termination
	request from the remote TCP peer, or an		request from the remote TCP peer or an
	acknowledgment of the connection termination request		acknowledgment of the connection termination
	previously sent.";		request previously sent.";
	}		}
	enum fin-wait-2 {		enum fin-wait-2 {
	value 7;		value 7;
	description		description
	"Represents waiting for a connection termination		"Represents waiting for a connection termination
	request from the remote TCP peer.";		request from the remote TCP peer.";
	}		}
	enum close-wait {		enum close-wait {
	value 8;		value 8;
	description		description
	skipping to change at page 13, line 38 ¶		skipping to change at line 591 ¶
	request from the local user.";		request from the local user.";
	}		}
	enum last-ack {		enum last-ack {
	value 9;		value 9;
	description		description
	"Represents waiting for an acknowledgment of the		"Represents waiting for an acknowledgment of the
	connection termination request previously sent to		connection termination request previously sent to
	the remote TCP peer (this termination request sent		the remote TCP peer (this termination request sent
	to the remote TCP peer already included an		to the remote TCP peer already included an
	acknowledgment of the termination request sent from		acknowledgment of the termination request sent from
	the remote TCP peer)";		the remote TCP peer).";
	}		}
	enum closing {		enum closing {
	value 10;		value 10;
	description		description
	"Represents waiting for a connection termination		"Represents waiting for a connection termination
	request acknowledgment from the remote TCP peer.";		request acknowledgment from the remote TCP peer.";
	}		}
	enum time-wait {		enum time-wait {
	value 11;		value 11;
	description		description
	"Represents waiting for enough time to pass to be		"Represents waiting for enough time to pass to be
	sure the remote TCP peer received the acknowledgment		sure the remote TCP peer received the
	of its connection termination request, and to avoid		acknowledgment of its connection termination
	new connections being impacted by delayed segments		request and to avoid new connections being impacted
	from previous connections.";		by delayed segments from previous connections.";
	}		}
	}		}
	config false;		config false;
	description		description
	"The state of this TCP connection.";		"The state of this TCP connection.";
	}		}
	description		description
	"List of TCP connections with their parameters.		"List of TCP connections with their parameters.
	The list is modeled as writeable even though only some of		The list is modeled as writeable even though only some of
	the nodes are writeable, e.g. keepalive. Connections		the nodes are writeable, e.g., keepalive. Connections
	that are created and match this list SHOULD apply the		that are created and match this list SHOULD apply the
	writeable parameters. At the same time, implementations		writeable parameters. At the same time, implementations
	may not allow creation of new TCP connections simply by		may not allow creation of new TCP connections simply by
	adding entries to the list. Furthermore, the behavior		adding entries to the list. Furthermore, the behavior
	upon removal is implementation-specific. Implementations		upon removal is implementation-specific. Implementations
	may not support closing or resetting a TCP connection		may not support closing or resetting a TCP connection
	upon an operation that removes the entry from the list.		upon an operation that removes the entry from the list.
	The operational state of this list SHOULD reflect		The operational state of this list SHOULD reflect
	connections that have configured, but not created, and		connections that have configured but not created and
	connections that have been created. Connections in		connections that have been created. Connections in the
	CLOSED state are not reflected on this list.";		CLOSED state are not reflected on this list.";
	}		}
	description		description
	"A container of all TCP connections.";		"A container of all TCP connections.";
	}		}
	list tcp-listeners {		list tcp-listeners {
	key "type address port";		key "type address port";
	config false;		config false;
	skipping to change at page 15, line 6 ¶		skipping to change at line 655 ¶
	description		description
	"The address type of address. The value		"The address type of address. The value
	should be unspecified (0) if connection initiations		should be unspecified (0) if connection initiations
	to all local IP addresses are accepted.";		to all local IP addresses are accepted.";
	}		}
	leaf address {		leaf address {
	type union {		type union {
	type inet:ip-address;		type inet:ip-address;
	type string {		type string {
	length 0;		length "0";
	}		}
	}		}
	description		description
	"The local IP address for this TCP connection.		"The local IP address for this TCP connection.
	The value of this node can be represented in three		The value of this node can be represented in three
	possible ways, depending on the characteristics of the		possible ways, depending on the characteristics of the
	listening application:		listening application:
	1. For an application willing to accept both IPv4 and		1. For an application willing to accept both IPv4 and
	IPv6 datagrams, the value of this node must be		IPv6 datagrams, the value of this node must be
	''h (a zero-length octet-string), with the value		''h (a zero-length octet string), with the value
	of the corresponding 'type' object being		of the corresponding 'type' object being
	unspecified (0).		unspecified (0).
	2. For an application willing to accept only IPv4 or		2. For an application willing to accept only IPv4 or
	IPv6 datagrams, the value of this node must be		IPv6 datagrams, the value of this node must be
	'0.0.0.0' or '::' respectively, with		'0.0.0.0' or '::' respectively, with
	'type' representing the appropriate address type.		'type' representing the appropriate address type.
	3. For an application which is listening for data		3. For an application that is listening for data
	destined only to a specific IP address, the value		destined only to a specific IP address, the value
	of this node is the specific local address, with		of this node is the specific local address, with
	'type' representing the appropriate address type.";		'type' representing the appropriate address type.";
	}		}
	leaf port {		leaf port {
	type inet:port-number;		type inet:port-number;
	description		description
	"The local port number for this TCP connection.";		"The local port number for this TCP connection.";
	}		}
	}		}
	container statistics {		container statistics {
	if-feature statistics;		if-feature "statistics";
	config false;		config false;
	leaf active-opens {		leaf active-opens {
	type yang:counter64;		type yang:counter64;
	description		description
	"The number of times that TCP connections have made a		"The number of times that TCP connections have made a
	direct transition to the SYN-SENT state from the CLOSED		direct transition to the SYN-SENT state from the CLOSED
	state.";		state.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf passive-opens {		leaf passive-opens {
	type yang:counter64;		type yang:counter64;
	description		description
	"The number of times TCP connections have made a direct		"The number of times TCP connections have made a direct
	transition to the SYN-RCVD state from the LISTEN state.";		transition to the SYN-RCVD state from the LISTEN state.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf attempt-fails {		leaf attempt-fails {
	type yang:counter64;		type yang:counter64;
	description		description
	"The number of times that TCP connections have made a		"The number of times that TCP connections have made a
	direct transition to the CLOSED state from either the		direct transition to the CLOSED state from either the
	SYN-SENT state or the SYN-RCVD state, plus the number of		SYN-SENT state or the SYN-RCVD state, plus the number of
	times that TCP connections have made a direct transition		times that TCP connections have made a direct transition
	to the LISTEN state from the SYN-RCVD state.";		to the LISTEN state from the SYN-RCVD state.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf establish-resets {		leaf establish-resets {
	type yang:counter64;		type yang:counter64;
	description		description
	"The number of times that TCP connections have made a		"The number of times that TCP connections have made a
	direct transition to the CLOSED state from either the		direct transition to the CLOSED state from either the
	ESTABLISHED state or the CLOSE-WAIT state.";		ESTABLISHED state or the CLOSE-WAIT state.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf currently-established {		leaf currently-established {
	type yang:gauge32;		type yang:gauge32;
	description		description
	"The number of TCP connections for which the current state		"The number of TCP connections for which the current state
	is either ESTABLISHED or CLOSE-WAIT.";		is either ESTABLISHED or CLOSE-WAIT.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf in-segments {		leaf in-segments {
	type yang:counter64;		type yang:counter64;
	description		description
	"The total number of TCP segments received, including those		"The total number of TCP segments received, including those
	received in error. This count includes TCP segments		received in error. This count includes TCP segments
	received on currently established connections.";		received on currently established connections.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf out-segments {		leaf out-segments {
	type yang:counter64;		type yang:counter64;
	description		description
	"The total number of TCP segments sent, including those on		"The total number of TCP segments sent, including those on
	current connections but excluding those containing only		current connections but excluding those containing only
	retransmitted octets.";		retransmitted octets.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf retransmitted-segments {		leaf retransmitted-segments {
	type yang:counter64;		type yang:counter64;
	description		description
	"The total number of TCP segments retransmitted; that is,		"The total number of TCP segments retransmitted; that is,
	the number of TCP segments transmitted containing one or		the number of TCP segments transmitted containing one or
	more previously transmitted octets.";		more previously transmitted octets.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf in-errors {		leaf in-errors {
	type yang:counter64;		type yang:counter64;
	description		description
	"The total number of TCP segments received in error		"The total number of TCP segments received in error
	(e.g., bad TCP checksums).";		(e.g., bad TCP checksums).";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf out-resets {		leaf out-resets {
	type yang:counter64;		type yang:counter64;
	description		description
	"The number of TCP segments sent containing the RST flag.";		"The number of TCP segments sent containing the RST flag.";
	reference		reference
	"RFC 9293: Transmission Control Protocol (TCP)		"RFC 9293: Transmission Control Protocol (TCP).";
	Specification.";
	}		}
	leaf auth-failures {		leaf auth-failures {
	if-feature authentication;		if-feature "authentication";
	type yang:counter64;		type yang:counter64;
	description		description
	"The number of times that authentication has failed either		"The number of times that authentication has failed either
	with TCP-AO or MD5.";		with TCP-AO or MD5.";
	}		}
	action reset {		action reset {
	nacm:default-deny-all;		nacm:default-deny-all;
	description		description
	"Reset statistics action command.";		"Reset statistics action command.";
	skipping to change at page 18, line 46 ¶		skipping to change at line 829 ¶
	"Statistics across all connections.";		"Statistics across all connections.";
	}		}
	}		}
	augment "/key-chain:key-chains/key-chain:key-chain/key-chain:key" {		augment "/key-chain:key-chains/key-chain:key-chain/key-chain:key" {
	description		description
	"Augmentation of the key-chain model to add TCP-AO and TCP-MD5		"Augmentation of the key-chain model to add TCP-AO and TCP-MD5
	authentication.";		authentication.";
	container authentication {		container authentication {
	if-feature authentication;		if-feature "authentication";
	leaf keychain {		leaf keychain {
	type key-chain:key-chain-ref;		type key-chain:key-chain-ref;
	description		description
	"Reference to the key chain that will be used by		"Reference to the key chain that will be used by
	this model. Applicable for TCP-AO and TCP-MD5		this model. Applicable for TCP-AO and TCP-MD5
	only";		only.";
	reference		reference
	"RFC 8177: YANG Key Chain.";		"RFC 8177: YANG Data Model for Key Chains.";
	}		}
	choice authentication {		choice authentication {
	container ao {		container ao {
	presence "Presence container for all TCP-AO related" +		presence "Presence container for all TCP-AO related"
	" configuration";		+ " configuration";
	uses ao;		uses ao;
	description		description
	"Use TCP-AO to secure the connection.";		"Use TCP-AO to secure the connection.";
	}		}
	container md5 {		container md5 {
	presence "Presence container for all MD5 related" +		presence "Presence container for all MD5 related"
	" configuration";		+ " configuration";
	description		description
	"Use TCP-MD5 to secure the connection. As the TCP MD5		"Use TCP-MD5 to secure the connection. As the TCP MD5
	signature option is obsoleted by TCP-AO, it is		signature option is obsoleted by TCP-AO, it is
	RECOMMENDED to use TCP-AO instead.";		RECOMMENDED to use TCP-AO instead.";
	reference		reference
	"RFC 2385: Protection of BGP Sessions via the TCP MD5		"RFC 2385: Protection of BGP Sessions via the TCP MD5
	Signature.";		Signature Option.";
	}		}
	description		description
	"Choice of TCP authentication.";		"Choice of TCP authentication.";
	}		}
	description		description
	"Authentication definitions for TCP configuration.		"Authentication definitions for TCP configuration.
	This includes parameters such as how to secure the		This includes parameters such as how to secure the
	connection, that can be part of either the client		connection, which can be part of either the client
	or server.";		or server.";
	}		}
	}		}
	}		}
	<CODE ENDS>		<CODE ENDS>
	5. IANA Considerations		5. IANA Considerations
	5.1. The IETF XML Registry		5.1. The IETF XML Registry
	This document registers an URI in the "ns" subregistry of the IETF		IANA has registered the following URI in the "ns" registry defined in
	XML Registry [RFC3688]. Following the format in IETF XML Registry		the "IETF XML Registry" [RFC3688].
	[RFC3688], the following registration is requested:
	URI: urn:ietf:params:xml:ns:yang:ietf-tcp		URI: urn:ietf:params:xml:ns:yang:ietf-tcp
	Registrant Contact: The IESG.		Registrant Contact: The IESG
	XML: N/A, the requested URI is an XML namespace.		XML: N/A; the requested URI is an XML namespace.
	5.2. The YANG Module Names Registry		5.2. The YANG Module Names Registry
	The following entry is requested to be added to the "YANG Module		IANA has registered the following in the "YANG Module Names" registry
	Names" registry created by YANG - A Data Modeling Language for the		created by "YANG - A Data Modeling Language for the Network
	Network Configuration Protocol (NETCONF) [RFC6020]:		Configuration Protocol (NETCONF)" [RFC6020].
	name: ietf-tcp		Name: ietf-tcp
	namespace: urn:ietf:params:xml:ns:yang:ietf-tcp		Namespace: urn:ietf:params:xml:ns:yang:ietf-tcp
	prefix: tcp		Prefix: tcp
	reference: RFC XXXX (this document)		Reference: RFC 9648
	The registration is not maintained by IANA.		This is not an IANA maintained module; however, the URI and other
			details of the module are maintained by IANA.
	6. Security Considerations		6. Security Considerations
	The YANG module specified in this document defines a schema for data		This section is modeled after the template defined in Section 3.7.1
	that is designed to be accessed via network management protocols such		of [RFC8407].
	as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer
	is the secure transport layer, and the mandatory-to-implement secure		The "ietf-tcp" YANG module defines a schema for data that is designed
	transport is Secure Shell (SSH) described in Using the NETCONF		to be accessed via YANG-based management protocols, such as NETCONF
	protocol over SSH [RFC6242]. The lowest RESTCONF layer is HTTPS, and		[RFC6241] and RESTCONF [RFC8040]. These protocols have mandatory-to-
	the mandatory-to-implement secure transport is TLS [RFC8446].		implement secure transport layers (e.g., Secure Shell (SSH)
			[RFC4252], TLS [RFC8446], and QUIC [RFC9000]) and mandatory-to-
			implement mutual authentication.
	The Network Configuration Access Control Model (NACM) [RFC8341]		The Network Configuration Access Control Model (NACM) [RFC8341]
	provides the means to restrict access for particular NETCONF or		provides the means to restrict access for particular NETCONF or
	RESTCONF users to a preconfigured subset of all available NETCONF or		RESTCONF users to a preconfigured subset of all available NETCONF or
	RESTCONF protocol operations and content.		RESTCONF protocol operations and content.
	There are a number of data nodes defined in this YANG module that are		There are a number of data nodes defined in this YANG module that are
	writable/creatable/deletable (i.e., "config true", which is the		writable/creatable/deletable (i.e., "config true", which is the
	default). These data nodes may be considered sensitive or vulnerable		default). These data nodes may be considered sensitive or vulnerable
	in some network environments. Write operations (e.g., edit-config)		in some network environments. Write operations (e.g., edit-config)
	to these data nodes without proper protection can have a negative		to these data nodes without proper protection can have a negative
	effect on network operations. These are the subtrees and data nodes		effect on network operations. These are the subtrees and data nodes
	and their sensitivity/vulnerability:		and their sensitivity/vulnerability:
	* Common configuration included from NETCONF Client and Server		* Common configuration included from NETCONF client and server
	Models [I-D.ietf-netconf-tcp-client-server]. Unrestricted access		models [RFC9643]. Unrestricted access to all the nodes, e.g.,
	to all the nodes, e.g., keepalive idle-timer, can cause		keepalive idle timer, can cause connections to fail or to timeout
	connections to fail or to timeout prematurely.		prematurely.
	* Authentication configuration. Unrestricted access to the nodes		* Authentication configuration. Unrestricted access to the nodes
	under authentication configuration can prevent the use of		under authentication configuration can prevent the use of
	authenticated communication and cause connection setups to fail.		authenticated communication and cause connection setups to fail.
	This can result in massive security vulnerabilities and service		This can result in massive security vulnerabilities and service
	disruption for the traffic requiring authentication.		disruption for the traffic requiring authentication.
	Some of the readable data nodes in this YANG module may be considered		Some of the readable data nodes in this YANG module may be considered
	sensitive or vulnerable in some network environments. It is thus		sensitive or vulnerable in some network environments. It is thus
	important to control read access (e.g., via get, get-config, or		important to control read access (e.g., via get, get-config, or
	skipping to change at page 21, line 35 ¶		skipping to change at line 958 ¶
	sensitive or vulnerable in some network environments. It is thus		sensitive or vulnerable in some network environments. It is thus
	important to control access to these operations. These are the		important to control access to these operations. These are the
	operations and their sensitivity/vulnerability:		operations and their sensitivity/vulnerability:
	* The YANG module allows for the statistics to be cleared by		* The YANG module allows for the statistics to be cleared by
	executing the reset action. This action should be restricted to		executing the reset action. This action should be restricted to
	users with the right permission.		users with the right permission.
	The module specified in this document supports MD5 to basically		The module specified in this document supports MD5 to basically
	accommodate the installed BGP base. MD5 suffers from the security		accommodate the installed BGP base. MD5 suffers from the security
	weaknesses discussed in Section 2 of RFC 6151 [RFC6151] or		weaknesses discussed in Section 2 of [RFC6151] or Section 2.1 of
	Section 2.1 of RFC 6952 [RFC6952].		[RFC6952].
	7. References		7. References
	7.1. Normative References		7.1. Normative References
	[I-D.ietf-netconf-tcp-client-server]
	Watsen, K. and M. Scharf, "YANG Groupings for TCP Clients
	and TCP Servers", Work in Progress, Internet-Draft, draft-
	ietf-netconf-tcp-client-server-13, 24 May 2022,
	<https://www.ietf.org/archive/id/draft-ietf-netconf-tcp-
	client-server-13.txt>.
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,		Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997,		DOI 10.17487/RFC2119, March 1997,
	<https://www.rfc-editor.org/info/rfc2119>.		<https://www.rfc-editor.org/info/rfc2119>.
	[RFC2385] Heffernan, A., "Protection of BGP Sessions via the TCP MD5		[RFC2385] Heffernan, A., "Protection of BGP Sessions via the TCP MD5
	Signature Option", RFC 2385, DOI 10.17487/RFC2385, August		Signature Option", RFC 2385, DOI 10.17487/RFC2385, August
	1998, <https://www.rfc-editor.org/info/rfc2385>.		1998, <https://www.rfc-editor.org/info/rfc2385>.
	[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,		[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
	DOI 10.17487/RFC3688, January 2004,		DOI 10.17487/RFC3688, January 2004,
	<https://www.rfc-editor.org/info/rfc3688>.		<https://www.rfc-editor.org/info/rfc3688>.
			[RFC4252] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
			Authentication Protocol", RFC 4252, DOI 10.17487/RFC4252,
			January 2006, <https://www.rfc-editor.org/info/rfc4252>.
	[RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP		[RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP
	Authentication Option", RFC 5925, DOI 10.17487/RFC5925,		Authentication Option", RFC 5925, DOI 10.17487/RFC5925,
	June 2010, <https://www.rfc-editor.org/info/rfc5925>.		June 2010, <https://www.rfc-editor.org/info/rfc5925>.
	[RFC5926] Lebovitz, G. and E. Rescorla, "Cryptographic Algorithms		[RFC5926] Lebovitz, G. and E. Rescorla, "Cryptographic Algorithms
	for the TCP Authentication Option (TCP-AO)", RFC 5926,		for the TCP Authentication Option (TCP-AO)", RFC 5926,
	DOI 10.17487/RFC5926, June 2010,		DOI 10.17487/RFC5926, June 2010,
	<https://www.rfc-editor.org/info/rfc5926>.		<https://www.rfc-editor.org/info/rfc5926>.
	[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for		[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
	the Network Configuration Protocol (NETCONF)", RFC 6020,		the Network Configuration Protocol (NETCONF)", RFC 6020,
	DOI 10.17487/RFC6020, October 2010,		DOI 10.17487/RFC6020, October 2010,
	<https://www.rfc-editor.org/info/rfc6020>.		<https://www.rfc-editor.org/info/rfc6020>.
	[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,		[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
	and A. Bierman, Ed., "Network Configuration Protocol		and A. Bierman, Ed., "Network Configuration Protocol
	(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,		(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
	<https://www.rfc-editor.org/info/rfc6241>.		<https://www.rfc-editor.org/info/rfc6241>.
	[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
	Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
	<https://www.rfc-editor.org/info/rfc6242>.
	[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",		[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
	RFC 6991, DOI 10.17487/RFC6991, July 2013,		RFC 6991, DOI 10.17487/RFC6991, July 2013,
	<https://www.rfc-editor.org/info/rfc6991>.		<https://www.rfc-editor.org/info/rfc6991>.
	[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",		[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
	RFC 7950, DOI 10.17487/RFC7950, August 2016,		RFC 7950, DOI 10.17487/RFC7950, August 2016,
	<https://www.rfc-editor.org/info/rfc7950>.		<https://www.rfc-editor.org/info/rfc7950>.
	[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF		[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
	Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,		Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
	skipping to change at page 23, line 28 ¶		skipping to change at line 1040 ¶
	[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,		[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
	and R. Wilton, "Network Management Datastore Architecture		and R. Wilton, "Network Management Datastore Architecture
	(NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,		(NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
	<https://www.rfc-editor.org/info/rfc8342>.		<https://www.rfc-editor.org/info/rfc8342>.
	[RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol		[RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol
	Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,		Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
	<https://www.rfc-editor.org/info/rfc8446>.		<https://www.rfc-editor.org/info/rfc8446>.
			[RFC9000] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
			Multiplexed and Secure Transport", RFC 9000,
			DOI 10.17487/RFC9000, May 2021,
			<https://www.rfc-editor.org/info/rfc9000>.
	[RFC9293] Eddy, W., Ed., "Transmission Control Protocol (TCP)",		[RFC9293] Eddy, W., Ed., "Transmission Control Protocol (TCP)",
	STD 7, RFC 9293, DOI 10.17487/RFC9293, August 2022,		STD 7, RFC 9293, DOI 10.17487/RFC9293, August 2022,
	<https://www.rfc-editor.org/info/rfc9293>.		<https://www.rfc-editor.org/info/rfc9293>.
	7.2. Informative References		[RFC9643] Watsen, K. and M. Scharf, "YANG Groupings for TCP Clients
			and TCP Servers", RFC 9643, DOI 10.17487/RFC9643,
			September 2024, <https://www.rfc-editor.org/info/rfc9643>.
	[I-D.ietf-i2nsf-capability-data-model]		7.2. Informative References
	Hares, S., Jeong, J. P., Kim, J. T., Moskowitz, R., and Q.
	Lin, "I2NSF Capability YANG Data Model", Work in Progress,
	Internet-Draft, draft-ietf-i2nsf-capability-data-model-32,
	23 May 2022, <https://www.ietf.org/archive/id/draft-ietf-
	i2nsf-capability-data-model-32.txt>.
	[I-D.ietf-i2nsf-nsf-facing-interface-dm]		[BGP-MODEL]
	Kim, J. T., Jeong, J. P., Park, J., Hares, S., and Q. Lin,		Jethanandani, M., Patel, K., Hares, S., and J. Haas, "YANG
	"I2NSF Network Security Function-Facing Interface YANG		Model for Border Gateway Protocol (BGP-4)", Work in
	Data Model", Work in Progress, Internet-Draft, draft-ietf-		Progress, Internet-Draft, draft-ietf-idr-bgp-model-17, 5
	i2nsf-nsf-facing-interface-dm-29, 1 June 2022,		July 2023, <https://datatracker.ietf.org/doc/html/draft-
	<https://www.ietf.org/archive/id/draft-ietf-i2nsf-nsf-		ietf-idr-bgp-model-17>.
	facing-interface-dm-29.txt>.
	[I-D.ietf-idr-bgp-model]		[NSF-CAP-YANG]
	Jethanandani, M., Patel, K., Hares, S., and J. Haas, "BGP		Hares, S., Ed., Jeong, J., Ed., Kim, J., Moskowitz, R.,
	YANG Model for Service Provider Networks", Work in		and Q. Lin, "I2NSF Capability YANG Data Model", Work in
	Progress, Internet-Draft, draft-ietf-idr-bgp-model-14, 3		Progress, Internet-Draft, draft-ietf-i2nsf-capability-
	July 2022, <https://www.ietf.org/archive/id/draft-ietf-		data-model-32, 23 May 2022,
	idr-bgp-model-14.txt>.		<https://datatracker.ietf.org/doc/html/draft-ietf-i2nsf-
			capability-data-model-32>.
	[I-D.ietf-taps-interface]		[NSF-FACING-YANG]
	Trammell, B., Welzl, M., Enghardt, T., Fairhurst, G.,		Kim, J., Ed., Jeong, J., Ed., Park, J., Hares, S., and Q.
	Kuehlewind, M., Perkins, C., Tiesel, P. S., and T. Pauly,		Lin, "I2NSF Network Security Function-Facing Interface
	"An Abstract Application Layer Interface to Transport		YANG Data Model", Work in Progress, Internet-Draft, draft-
	Services", Work in Progress, Internet-Draft, draft-ietf-		ietf-i2nsf-nsf-facing-interface-dm-29, 1 June 2022,
	taps-interface-16, 31 August 2022,		<https://datatracker.ietf.org/doc/html/draft-ietf-i2nsf-
	<https://www.ietf.org/archive/id/draft-ietf-taps-		nsf-facing-interface-dm-29>.
	interface-16.txt>.
	[RFC4022] Raghunarayan, R., Ed., "Management Information Base for		[RFC4022] Raghunarayan, R., Ed., "Management Information Base for
	the Transmission Control Protocol (TCP)", RFC 4022,		the Transmission Control Protocol (TCP)", RFC 4022,
	DOI 10.17487/RFC4022, March 2005,		DOI 10.17487/RFC4022, March 2005,
	<https://www.rfc-editor.org/info/rfc4022>.		<https://www.rfc-editor.org/info/rfc4022>.
	[RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private		[RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private
	Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February		Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February
	2006, <https://www.rfc-editor.org/info/rfc4364>.		2006, <https://www.rfc-editor.org/info/rfc4364>.
	skipping to change at page 25, line 5 ¶		skipping to change at line 1107 ¶
	Information Version 2 (SMIv2) MIB Modules to YANG		Information Version 2 (SMIv2) MIB Modules to YANG
	Modules", RFC 6643, DOI 10.17487/RFC6643, July 2012,		Modules", RFC 6643, DOI 10.17487/RFC6643, July 2012,
	<https://www.rfc-editor.org/info/rfc6643>.		<https://www.rfc-editor.org/info/rfc6643>.
	[RFC6952] Jethanandani, M., Patel, K., and L. Zheng, "Analysis of		[RFC6952] Jethanandani, M., Patel, K., and L. Zheng, "Analysis of
	BGP, LDP, PCEP, and MSDP Issues According to the Keying		BGP, LDP, PCEP, and MSDP Issues According to the Keying
	and Authentication for Routing Protocols (KARP) Design		and Authentication for Routing Protocols (KARP) Design
	Guide", RFC 6952, DOI 10.17487/RFC6952, May 2013,		Guide", RFC 6952, DOI 10.17487/RFC6952, May 2013,
	<https://www.rfc-editor.org/info/rfc6952>.		<https://www.rfc-editor.org/info/rfc6952>.
			[RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
			Interchange Format", STD 90, RFC 8259,
			DOI 10.17487/RFC8259, December 2017,
			<https://www.rfc-editor.org/info/rfc8259>.
			[RFC8407] Bierman, A., "Guidelines for Authors and Reviewers of
			Documents Containing YANG Data Models", BCP 216, RFC 8407,
			DOI 10.17487/RFC8407, October 2018,
			<https://www.rfc-editor.org/info/rfc8407>.
	[RFC8512] Boucadair, M., Ed., Sivakumar, S., Jacquenet, C.,		[RFC8512] Boucadair, M., Ed., Sivakumar, S., Jacquenet, C.,
	Vinapamula, S., and Q. Wu, "A YANG Module for Network		Vinapamula, S., and Q. Wu, "A YANG Module for Network
	Address Translation (NAT) and Network Prefix Translation		Address Translation (NAT) and Network Prefix Translation
	(NPT)", RFC 8512, DOI 10.17487/RFC8512, January 2019,		(NPT)", RFC 8512, DOI 10.17487/RFC8512, January 2019,
	<https://www.rfc-editor.org/info/rfc8512>.		<https://www.rfc-editor.org/info/rfc8512>.
	[RFC8513] Boucadair, M., Jacquenet, C., and S. Sivakumar, "A YANG		[RFC8513] Boucadair, M., Jacquenet, C., and S. Sivakumar, "A YANG
	Data Model for Dual-Stack Lite (DS-Lite)", RFC 8513,		Data Model for Dual-Stack Lite (DS-Lite)", RFC 8513,
	DOI 10.17487/RFC8513, January 2019,		DOI 10.17487/RFC8513, January 2019,
	<https://www.rfc-editor.org/info/rfc8513>.		<https://www.rfc-editor.org/info/rfc8513>.
	skipping to change at page 25, line 31 ¶		skipping to change at line 1143 ¶
	[RFC8684] Ford, A., Raiciu, C., Handley, M., Bonaventure, O., and C.		[RFC8684] Ford, A., Raiciu, C., Handley, M., Bonaventure, O., and C.
	Paasch, "TCP Extensions for Multipath Operation with		Paasch, "TCP Extensions for Multipath Operation with
	Multiple Addresses", RFC 8684, DOI 10.17487/RFC8684, March		Multiple Addresses", RFC 8684, DOI 10.17487/RFC8684, March
	2020, <https://www.rfc-editor.org/info/rfc8684>.		2020, <https://www.rfc-editor.org/info/rfc8684>.
	[RFC8783] Boucadair, M., Ed. and T. Reddy.K, Ed., "Distributed		[RFC8783] Boucadair, M., Ed. and T. Reddy.K, Ed., "Distributed
	Denial-of-Service Open Threat Signaling (DOTS) Data		Denial-of-Service Open Threat Signaling (DOTS) Data
	Channel Specification", RFC 8783, DOI 10.17487/RFC8783,		Channel Specification", RFC 8783, DOI 10.17487/RFC8783,
	May 2020, <https://www.rfc-editor.org/info/rfc8783>.		May 2020, <https://www.rfc-editor.org/info/rfc8783>.
			[RFC8792] Watsen, K., Auerswald, E., Farrel, A., and Q. Wu,
			"Handling Long Lines in Content of Internet-Drafts and
			RFCs", RFC 8792, DOI 10.17487/RFC8792, June 2020,
			<https://www.rfc-editor.org/info/rfc8792>.
	[RFC9182] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M.,		[RFC9182] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M.,
	Ed., Munoz, L., and A. Aguado, "A YANG Network Data Model		Ed., Munoz, L., and A. Aguado, "A YANG Network Data Model
	for Layer 3 VPNs", RFC 9182, DOI 10.17487/RFC9182,		for Layer 3 VPNs", RFC 9182, DOI 10.17487/RFC9182,
	February 2022, <https://www.rfc-editor.org/info/rfc9182>.		February 2022, <https://www.rfc-editor.org/info/rfc9182>.
	[RFC9235] Touch, J. and J. Kuusisaari, "TCP Authentication Option		[RFC9235] Touch, J. and J. Kuusisaari, "TCP Authentication Option
	(TCP-AO) Test Vectors", RFC 9235, DOI 10.17487/RFC9235,		(TCP-AO) Test Vectors", RFC 9235, DOI 10.17487/RFC9235,
	May 2022, <https://www.rfc-editor.org/info/rfc9235>.		May 2022, <https://www.rfc-editor.org/info/rfc9235>.
	Appendix A. Acknowledgements		[TAPS-INTERFACE]
			Trammell, B., Ed., Welzl, M., Ed., Enghardt, R.,
	Michael Scharf was supported by the StandICT.eu project, which is		Fairhurst, G., Kühlewind, M., Perkins, C., Tiesel, P., and
	funded by the European Commission under the Horizon 2020 Programme.		T. Pauly, "An Abstract Application Layer Interface to
			Transport Services", Work in Progress, Internet-Draft,
			draft-ietf-taps-interface-26, 16 March 2024,
			<https://datatracker.ietf.org/doc/html/draft-ietf-taps-
			interface-26>.
	The following persons have contributed to this document by reviews		[W3C.REC-xml-20081126]
	(in alphabetical order): Mohamed Boucadair, Gorry Fairhurst, Jeffrey		Bray, T., Paoli, J., Sperberg-McQueen, C.M., Maler, E.,
	Haas, and Tom Petch.		and F. Yergeau, "Extensible Markup Language (XML) 1.0
			(Fifth Edition)", World Wide Web Consortium
			Recommendation REC-xml-20081126, November 2008,
			<https://www.w3.org/TR/2008/REC-xml-20081126/>.
	Appendix B. Examples		Appendix A. Examples
	B.1. Keepalive Configuration
	This particular example demonstrates how both a particular connection		A.1. Keepalive Configuration
	can be configured for keepalives.
	NOTE: '\' line wrapping per RFC 8792		This particular example demonstrates how a particular connection can
			be configured for keepalives.
	<?xml version="1.0" encoding="UTF-8"?>		NOTE: '\' line wrapping per RFC 8792
	<!--
	This example shows how TCP keepalive, MSS and PMTU can be configured \
	for a given connection. An idle connection is dropped after		<?xml version="1.0" encoding="UTF-8"?>
	idle-time + (max-probes * probe-interval).		<!--
	-->		This example shows how TCP keepalive, MSS, and PMTU can be configure\
	<tcp		d for a given connection. An idle connection is dropped after
	xmlns="urn:ietf:params:xml:ns:yang:ietf-tcp">		idle-time + (max-probes * probe-interval).
	<connections>		-->
	<connection>		<tcp
	<local-address>192.0.2.1</local-address>		xmlns="urn:ietf:params:xml:ns:yang:ietf-tcp">
	<remote-address>192.0.2.2</remote-address>		<connections>
	<local-port>1025</local-port>		<connection>
	<remote-port>22</remote-port>		<local-address>192.0.2.1</local-address>
	<mss>1400</mss>		<remote-address>192.0.2.2</remote-address>
	<pmtud>true</pmtud>		<local-port>1025</local-port>
	<keepalives>		<remote-port>22</remote-port>
	<idle-time>5</idle-time>		<mss>1400</mss>
	<max-probes>5</max-probes>		<pmtud>true</pmtud>
	<probe-interval>10</probe-interval>		<keepalives>
	</keepalives>		<idle-time>5</idle-time>
	</connection>		<max-probes>5</max-probes>
	</connections>		<probe-interval>10</probe-interval>
	</tcp>		</keepalives>
			</connection>
			</connections>
			</tcp>
	B.2. TCP-AO Configuration		A.2. TCP-AO Configuration
	The following example demonstrates how to model a TCP-AO [RFC5925]		The following example demonstrates how to model a TCP-AO [RFC5925]
	configuration for the example in TCP-AO Test Vectors [RFC9235]. The		configuration for the example in "TCP Authentication Option (TCP-AO)
	IP addresses and other parameters are taken from the test vectors.		Test Vectors" [RFC9235]. The IP addresses and other parameters are
			taken from the test vectors.
	NOTE: '\' line wrapping per RFC 8792		NOTE: '\' line wrapping per RFC 8792
	<?xml version="1.0" encoding="UTF-8"?>		<?xml version="1.0" encoding="UTF-8"?>
	<!--		<!--
	This example sets TCP-AO configuration parameters similar to		This example sets TCP-AO configuration parameters similarly to
	the examples in RFC 9235.		the examples in RFC 9235.
			-->
	<key-chains		<key-chains
	xmlns="urn:ietf:params:xml:ns:yang:ietf-key-chain">		xmlns="urn:ietf:params:xml:ns:yang:ietf-key-chain">
	<key-chain>		<key-chain>
	<name>ao-config</name>		<name>ao-config</name>
	<description>"An example for TCP-AO configuration."</description>\		<description>"An example for TCP-AO configuration."</description>
			<key>
			<key-id>55</key-id>
			<lifetime>
			<send-lifetime>
			<start-date-time>2017-01-01T00:00:00Z</start-date-time>
			<end-date-time>2017-02-01T00:00:00Z</end-date-time>
			</send-lifetime>
			<accept-lifetime>
			<start-date-time>2016-12-31T23:59:55Z</start-date-time>
			<end-date-time>2017-02-01T00:00:05Z</end-date-time>
			</accept-lifetime>
			</lifetime>
			<crypto-algorithm
			xmlns:tcp=
			"urn:ietf:params:xml:ns:yang:ietf-tcp">tcp:aes-128</crypto\
			-algorithm>
			<key-string>
			<keystring>testvector</keystring>
			</key-string>
			<authentication
			xmlns="urn:ietf:params:xml:ns:yang:ietf-tcp">
			<keychain>ao-config</keychain>
			<ao>
			<send-id>61</send-id>
			<recv-id>84</recv-id>
			</ao>
			</authentication>
			</key>
			</key-chain>
			</key-chains>
	<key>		Appendix B. Complete Tree Diagram
	<key-id>55</key-id>
	<lifetime>
	<send-lifetime>
	<start-date-time>2017-01-01T00:00:00Z</start-date-time>
	<end-date-time>2017-02-01T00:00:00Z</end-date-time>
	</send-lifetime>
	<accept-lifetime>
	<start-date-time>2016-12-31T23:59:55Z</start-date-time>
	<end-date-time>2017-02-01T00:00:05Z</end-date-time>
	</accept-lifetime>
	</lifetime>
	<crypto-algorithm
	xmlns:tcp=
	"urn:ietf:params:xml:ns:yang:ietf-tcp">tcp:aes-128</crypto-algorit\
	hm>
	<key-string>
	<keystring>testvector</keystring>
	</key-string>
	<authentication
	xmlns="urn:ietf:params:xml:ns:yang:ietf-tcp">
	<keychain>ao-config</keychain>
	<ao>
	<send-id>61</send-id>
	<recv-id>84</recv-id>
	</ao>
	</authentication>
	</key>
	</key-chain>
	</key-chains>
	Appendix C. Complete Tree Diagram
	Here is the complete tree diagram for the TCP YANG model.		Here is the complete tree diagram for the TCP YANG data model.
	module: ietf-tcp		module: ietf-tcp
	+--rw tcp!		+--rw tcp!
	+--rw connections		+--rw connections
	| +--rw connection*		| +--rw connection*
	| [local-address remote-address local-port remote-port]		| [local-address remote-address local-port remote-port]
	| +--rw local-address inet:ip-address		| +--rw local-address inet:ip-address
	| +--rw remote-address inet:ip-address		| +--rw remote-address inet:ip-address
	| +--rw local-port inet:port-number		| +--rw local-port inet:port-number
	| +--rw remote-port inet:port-number		| +--rw remote-port inet:port-number
	skipping to change at page 29, line 13 ¶		skipping to change at line 1315 ¶
	+--:(ao)		+--:(ao)
	| +--rw ao!		| +--rw ao!
	| +--rw send-id? uint8		| +--rw send-id? uint8
	| +--rw recv-id? uint8		| +--rw recv-id? uint8
	| +--rw include-tcp-options? boolean		| +--rw include-tcp-options? boolean
	| +--rw accept-key-mismatch? boolean		| +--rw accept-key-mismatch? boolean
	| +--ro r-next-key-id? uint8		| +--ro r-next-key-id? uint8
	+--:(md5)		+--:(md5)
	+--rw md5!		+--rw md5!
			Acknowledgements
			Michael Scharf was supported by the StandICT.eu project, which is
			funded by the European Commission under the Horizon 2020 Programme.
			The following persons have contributed to this document by reviews
			(in alphabetical order): Mohamed Boucadair, Gorry Fairhurst, Jeffrey
			Haas, and Tom Petch.
	Authors' Addresses		Authors' Addresses
	Michael Scharf		Michael Scharf
	Hochschule Esslingen - University of Applied Sciences		Hochschule Esslingen
			University of Applied Sciences
	Kanalstr. 33		Kanalstr. 33
	73728 Esslingen		73728 Esslingen am Neckar
	Germany		Germany
	Email: michael.scharf@hs-esslingen.de		Email: michael.scharf@hs-esslingen.de
	Mahesh Jethanandani		Mahesh Jethanandani
	Kloud Services		Kloud Services
	Email: mjethanandani@gmail.com		Email: mjethanandani@gmail.com
	Vishal Murgai		Vishal Murgai
	Samsung		F5, Inc.
	Email: vmurgai@gmail.com		Email: vmurgai@gmail.com
End of changes. 139 change blocks.
	402 lines changed or deleted		413 lines changed or added
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