draft-ietf-ippm-checksum-trailer-02.txt		draft-ietf-ippm-checksum-trailer-03.txt
	Network Working Group T. Mizrahi		Network Working Group T. Mizrahi
	Internet Draft Marvell		Internet Draft Marvell
	Intended status: Informational		Intended status: Experimental
	Expires: January 2016 July 20, 2015		Expires: April 2016 October 14, 2015
	UDP Checksum Complement in OWAMP and TWAMP		UDP Checksum Complement in OWAMP and TWAMP
	draft-ietf-ippm-checksum-trailer-02.txt		draft-ietf-ippm-checksum-trailer-03.txt
	Abstract		Abstract
	The One-Way Active Measurement Protocol (OWAMP) and the Two-Way		The One-Way Active Measurement Protocol (OWAMP) and the Two-Way
	Active Measurement Protocol (TWAMP) are used for performance		Active Measurement Protocol (TWAMP) are used for performance
	monitoring in IP networks. Delay measurement is performed in these		monitoring in IP networks. Delay measurement is performed in these
	protocols by using timestamped test packets. Some implementations use		protocols by using timestamped test packets. Some implementations use
	hardware-based timestamping engines that integrate the accurate		hardware-based timestamping engines that integrate the accurate
	transmission timestamp into every outgoing OWAMP/TWAMP test packet		transmission timestamp into every outgoing OWAMP/TWAMP test packet
	during transmission. Since these packets are transported over UDP,		during transmission. Since these packets are transported over UDP,
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	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	The list of current Internet-Drafts can be accessed at		The list of current Internet-Drafts can be accessed at
	http://www.ietf.org/ietf/1id-abstracts.txt.		http://www.ietf.org/ietf/1id-abstracts.txt.
	The list of Internet-Draft Shadow Directories can be accessed at		The list of Internet-Draft Shadow Directories can be accessed at
	http://www.ietf.org/shadow.html.		http://www.ietf.org/shadow.html.
	This Internet-Draft will expire on January 20, 2016.		This Internet-Draft will expire on April 14, 2016.
	Copyright Notice		Copyright Notice
	Copyright (c) 2015 IETF Trust and the persons identified as the		Copyright (c) 2015 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		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	skipping to change at page 2, line 25		skipping to change at page 2, line 25
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction...................................................2		1. Introduction...................................................2
	2. Conventions used in this document..............................4		2. Conventions used in this document..............................4
	2.1. Terminology...............................................4		2.1. Terminology...............................................4
	2.2. Abbreviations.............................................4		2.2. Abbreviations.............................................5
	3. Using the UDP Checksum Complement in OWAMP and TWAMP...........5		3. Using the UDP Checksum Complement in OWAMP and TWAMP...........5
	3.1. Overview..................................................5		3.1. Overview..................................................5
	3.2. OWAMP / TWAMP Test Packets with Checksum Complement.......5		3.2. OWAMP / TWAMP Test Packets with Checksum Complement.......5
	3.2.1. Transmission of OWAMP/TWAMP with Checksum Complement.8		3.2.1. Transmission of OWAMP/TWAMP with Checksum Complement.8
	3.2.2. Intermediate Updates of OWAMP/TWAMP with Checksum		3.2.2. Intermediate Updates of OWAMP/TWAMP with Checksum
	Complement..................................................9		Complement..................................................9
	3.2.3. Reception of OWAMP/TWAMP with Checksum Complement....9		3.2.3. Reception of OWAMP/TWAMP with Checksum Complement....9
	3.3. Interoperability with Existing Implementations............9		3.3. Interoperability with Existing Implementations............9
	3.4. Using the Checksum Complement with or without Authentication		3.4. Using the Checksum Complement with or without Authentication
	...............................................................9		...............................................................9
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	The term Checksum Complement is used throughout this document and		The term Checksum Complement is used throughout this document and
	refers to the 2 octets at the end of the UDP payload, used for		refers to the 2 octets at the end of the UDP payload, used for
	updating the UDP checksum by intermediate entities.		updating the UDP checksum by intermediate entities.
	The usage of the Checksum Complement can in some cases simplify the		The usage of the Checksum Complement can in some cases simplify the
	implementation, since if the packet data is processed in a serial		implementation, since if the packet data is processed in a serial
	order, it is simpler to first update the timestamp field, and then		order, it is simpler to first update the timestamp field, and then
	update the Checksum Complement rather than to update the timestamp		update the Checksum Complement rather than to update the timestamp
	and then update the UDP checksum, residing at the UDP header.		and then update the UDP checksum, residing at the UDP header.
			The Checksum Complement mechanism is also defined for the Network
			Time Protocol in [NTPComp].
	2. Conventions used in this document		2. Conventions used in this document
	2.1. Terminology		2.1. Terminology
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this		"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
	document are to be interpreted as described in [KEYWORDS].		document are to be interpreted as described in [KEYWORDS].
	2.2. Abbreviations		2.2. Abbreviations
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	[IEEE1588] IEEE TC 9 Instrumentation and Measurement Society,		[IEEE1588] IEEE TC 9 Instrumentation and Measurement Society,
	"1588 IEEE Standard for a Precision Clock		"1588 IEEE Standard for a Precision Clock
	Synchronization Protocol for Networked Measurement and		Synchronization Protocol for Networked Measurement and
	Control Systems Version 2", IEEE Standard, 2008.		Control Systems Version 2", IEEE Standard, 2008.
	[IPPMIPsec] Pentikousis, K., Zhang, E., Cui, Y., "IKEv2-based		[IPPMIPsec] Pentikousis, K., Zhang, E., Cui, Y., "IKEv2-based
	Shared Secret Key for O/TWAMP", draft-ietf-ippm-ipsec		Shared Secret Key for O/TWAMP", draft-ietf-ippm-ipsec
	(work in progress), May 2015.		(work in progress), May 2015.
			[NTPComp] Mizrahi, T., "UDP Checksum Complement in the Network
			Time Protocol (NTP)", draft-ietf-ntp-checksum-trailer
			(work in progress), October 2015.
	[ZeroChecksum] Fairhurst, G., Westerlund, M., "Applicability		[ZeroChecksum] Fairhurst, G., Westerlund, M., "Applicability
	Statement for the Use of IPv6 UDP Datagrams with Zero		Statement for the Use of IPv6 UDP Datagrams with Zero
	Checksums", RFC 6936, April 2013.		Checksums", RFC 6936, April 2013.
	Authors' Addresses		Authors' Addresses
	Tal Mizrahi		Tal Mizrahi
	Marvell		Marvell
	6 Hamada St.		6 Hamada St.
	Yokneam, 20692 Israel		Yokneam, 20692 Israel
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