Network Working Group D. Schwartz Internet-Draft XConnect Global Networks Intended status: Informational D. Besprosvan Expires: May 15, 2008 Mailvision November 12, 2007 Requirements for domain marking for the purpose of Upstream Traffic Characterization draft-schwartz-sipping-domain-marking-requirements-00.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on May 15, 2008. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract SIP as defined in RFC 3261 [1] defines a Via header as a construct to be used for upstream response routing and for downstream assistance in loop detection. There is an increasing need on downstream administrative domains (ADs) to gain visibility into all the ADs in its upstream path. The information needed is not IP based as internal architectures at upstream ADs is of no consequence to Schwartz & Besprosvan Expires May 15, 2008 [Page 1] Internet-Draft Domain Marking Requirments November 2007 downstream ADs. Logical domain marking, however, is desperately needed for any traffic analysis to occur at the receiving side. Gathering AD information from Via headers is non obvious and in many instances nearly impossible. This documents identifies the requirements for addressing this issue. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Open Issues . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4 8. Normative References . . . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5 Intellectual Property and Copyright Statements . . . . . . . . . . 6 Schwartz & Besprosvan Expires May 15, 2008 [Page 2] Internet-Draft Domain Marking Requirments November 2007 1. Introduction When receiving a SIP request from an upstream Administrative Domain (AD) there is no easy way of identifying administrative domains traversed by the SIP request prior to arrival at the current AD. While Via information may be available (depending on presence of upstream B2BUA), its presence alone may not necessarily shed light onto the path traversed in terms of which ADs were hit as there is no assurance that a domain name appears in any of the Vias. A downstream AD may wish to characterize traffic entering his domain for reasons such as SPIT detection or simply to gain visibility into the traffic patterns arriving at his servers. This document identifies requirements for a new header that can be used to pass Administrative Domain Identities downstream in a SIP request. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [2]. In addition to the above, Terminology in this document makes use of the following terminology: Administrative Domain (AD): A collection of SIP entities, managed by single administrative authority Ingress Border SIP Entity (IBSE): The first SIP entity within AD to process an incoming SIP request from an upstream node AD Unique Identifier (ADUI): An identifier that is unique only within the context of an Administrative Domain 3. Requirements Req 1: It MUST be possible for the first SIP element in an Administrative Domain (AD) or the IBSE to uniquely identify the source of an incoming SIP request. Req 2: It MUST be possible for the IBSE to associate a unique identifier (ADUI) to a source and to maintain this ADUI for all future requests received from this source. Schwartz & Besprosvan Expires May 15, 2008 [Page 3] Internet-Draft Domain Marking Requirments November 2007 Req 3: It MUST not be possible for downstream ADs to gain any information about upstream ADs from the ADUI list other than their uniqueness. Req 4: It MUST be possible for the ADUI to be appended to a list of ADUIs added by ADs traversed prior to current AD. 4. Open Issues Should this mechanism be extended to SIP responses as well? Should there be any requirements on the strength of uniqueness of the ADUI? Do we want to allow for sub markings within an AD? 5. Security Considerations This document describes the requirements for a new header to assist in downstream traffic characterization. The security concerns are related to the ability of certain entities to create/modify/delete the unique ID described above. Any implementation of this document will have to address these issues at greater depth. 6. IANA Considerations This document does not require actions by IANA. 7. Acknowledgements Many Thanks to Brocha Strous of Kayote Networks and Jeremy Barkan of DigitalShtick for their insightful comments leading to the publication of this document. 8. Normative References [1] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002. [2] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, March 1997. Schwartz & Besprosvan Expires May 15, 2008 [Page 4] Internet-Draft Domain Marking Requirments November 2007 Authors' Addresses David Schwartz XConnect Global Networks Malcha Technology Park Building # 1 Jerusalem 90961 Israel Phone: +972 52 347 4656 Email: dschwartz@xconnect.net URI: www.xconnect.net Diego Besprosvan Mailvision 10a Haganim Street P.O.B. 8460 Haifa 31084 Israel Phone: +972-4-850-0505 ext 102 Email: diegob@mailvision.com URI: www.mailvision.com Schwartz & Besprosvan Expires May 15, 2008 [Page 5] Internet-Draft Domain Marking Requirments November 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. 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