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rfc:rfc3791

Network Working Group C. Olvera Request for Comments: 3791 Consulintel Category: Informational P. Nesser, II

                                            Nesser & Nesser Consulting
                                                             June 2004
           Survey of IPv4 Addresses in Currently Deployed
    IETF Routing Area Standards Track and Experimental Documents

Status of this Memo

 This memo provides information for the Internet community.  It does
 not specify an Internet standard of any kind.  Distribution of this
 memo is unlimited.

Copyright Notice

 Copyright (C) The Internet Society (2004).

Abstract

 This investigation work seeks to document all usage of IPv4 addresses
 in currently deployed IETF Routing Area documented standards.  In
 order to successfully transition from an all IPv4 Internet to an all
 IPv6 Internet, many interim steps will be taken.  One of these steps
 is the evolution of current protocols that have IPv4 dependencies.
 It is hoped that these protocols (and their implementations) will be
 redesigned to be network address independent, but failing that will
 at least dually support IPv4 and IPv6.  To this end, all Standards
 (Full, Draft, and Proposed) as well as Experimental RFCs will be
 surveyed and any dependencies will be documented.

Table of Contents

 1.  Introduction. . . . . . . . . . . . . . . . . . . . . . . . .   2
 2.  Document Organization . . . . . . . . . . . . . . . . . . . .   2
 3.  Full Standards. . . . . . . . . . . . . . . . . . . . . . . .   3
 4.  Draft Standards . . . . . . . . . . . . . . . . . . . . . . .   3
 5.  Proposed Standards. . . . . . . . . . . . . . . . . . . . . .   3
 6.  Experimental RFCs . . . . . . . . . . . . . . . . . . . . . .   7
 7.  Summary of Results. . . . . . . . . . . . . . . . . . . . . .   9
 8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
 9.  Acknowledgements. . . . . . . . . . . . . . . . . . . . . . .  12
 10. References. . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1. Normative References . . . . . . . . . . . . . . . . . . 13
     10.2. Informative References . . . . . . . . . . . . . . . . . 13

Olvera & Nesser II Informational [Page 1] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

 11. Authors' Addresses. . . . . . . . . . . . . . . . . . . . . .  14
 12. Full Copyright Statement. . . . . . . . . . . . . . . . . . .  15

1. Introduction

 This work aims to document all usage of IPv4 addresses in currently
 deployed IETF Routing Area documented standards.  Also, throughout
 this document there are discussions on how routing protocols might be
 updated to support IPv6 addresses.
 This material was originally presented within a single document, but
 in an effort to have the information in a manageable form, it has
 subsequently been split into 7 documents conforming to the current
 IETF main areas (Application [2], Internet [3], Operations &
 Management [4], Routing [this document], Security [5], Sub-IP [6] and
 Transport [7]).
 The general overview, methodology used during documentation and scope
 of the investigation for the whole 7 documents can be found in the
 introduction of this set of documents [1].
 It is important to mention that to perform this study the following
 classes of IETF standards are investigated: Full, Draft, and
 Proposed, as well as Experimental.  Informational, BCP and Historic
 RFCs are not addressed.  RFCs that have been obsoleted by either
 newer versions or as they have transitioned through the standards
 process are also not covered.

2. Document Organization

 The main Sections of this document are described below.
 Sections 3, 4, 5, and 6 each describe the raw analysis of Full,
 Draft, Proposed Standards and Experimental RFCs.  Each RFC is
 discussed in its turn starting with RFC 1 and ending (around) RFC
 3100.  The comments for each RFC are "raw" in nature.  That is, each
 RFC is discussed in a vacuum and problems or issues discussed do not
 "look ahead" to see if the problems have already been fixed.
 Section 7 is an analysis of the data presented in Sections 3, 4, 5,
 and 6.  It is here that all of the results are considered as a whole
 and the problems that have been resolved in later RFCs are
 correlated.

Olvera & Nesser II Informational [Page 2] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

3. Full Standards

 Full Internet Standards (most commonly simply referred to as
 "Standards") are fully mature protocol specification that are widely
 implemented and used throughout the Internet.

3.1. RFC 1722 (STD 57) RIP Version 2 Protocol Applicability Statement

 RIPv2 is only intended for IPv4 networks.

3.2. RFC 2328 (STD 54) OSPF Version 2

 This RFC defines a protocol for IPv4 routing.  It is highly
 assumptive about address formats being IPv4 in nature.

3.3. RFC 2453 (STD 56) RIP Version 2

 RIPv2 is only intended for IPv4 networks.

4. Draft Standards

 Draft Standards represent the penultimate standard level in the IETF.
 A protocol can only achieve draft standard when there are multiple,
 independent, interoperable implementations.  Draft Standards are
 usually quite mature and widely used.

4.1. RFC 1771 A Border Gateway Protocol 4 (BGP-4)

 This RFC defines a protocol used for exchange of IPv4 routing
 information and does not support IPv6 as is defined.

4.2. RFC 1772 Application of the Border Gateway Protocol in the

 Internet
 This RFC is a discussion of the use of BGP-4 on the Internet.

4.3. RFC 3392 Capabilities Advertisement with BGP-4

 Although the protocol enhancements have no IPv4 dependencies, the
 base protocol, BGP-4, is IPv4 only.

5. Proposed Standards

 Proposed Standards are introductory level documents.  There are no
 requirements for even a single implementation.  In many cases
 Proposed are never implemented or advanced in the IETF standards
 process.  They therefore are often just proposed ideas that are
 presented to the Internet community.  Sometimes flaws are exposed or

Olvera & Nesser II Informational [Page 3] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

 they are one of many competing solutions to problems.  In these later
 cases, no discussion is presented as it would not serve the purpose
 of this discussion.

5.1. RFC 1195 Use of OSI IS-IS for routing in TCP/IP and dual

    environments
 This document specifies a protocol for the exchange of IPv4 routing
 information.

5.2. RFC 1370 Applicability Statement for OSPF

 This document discusses a version of OSPF that is limited to IPv4.

5.3. RFC 1397 Default Route Advertisement In BGP2 and BGP3 Version of

    The Border Gateway Protocol
 BGP2 and BGP3 are both deprecated and therefore are not discussed in
 this document.

5.4. RFC 1478 An Architecture for Inter-Domain Policy Routing

 The architecture described in this document has no IPv4 dependencies.

5.5. RFC 1479 Inter-Domain Policy Routing Protocol Specification:

    Version 1 (IDPR)
 There are no IPv4 dependencies in this protocol.

5.6. RFC 1517 Applicability Statement for the Implementation of

    Classless Inter-Domain Routing (CIDR)
 This document deals exclusively with IPv4 addressing issue.

5.7. RFC 1518 An Architecture for IP Address Allocation with CIDR

 This document deals exclusively with IPv4 addressing issue.

5.8. RFC 1519 Classless Inter-Domain Routing (CIDR): an Address

    Assignment and Aggregation Strategy
 This document deals exclusively with IPv4 addressing issue.

5.9. RFC 1582 Extensions to RIP to Support Demand Circuits

 This protocol is an extension to a protocol for exchanging IPv4
 routing information.

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5.10. RFC 1584 Multicast Extensions to OSPF

 This document defines the use of IPv4 multicast to an IPv4 only
 routing protocol.

5.11. RFC 1793 Extending OSPF to Support Demand Circuits

 There are no IPv4 dependencies in this protocol other than the fact
 that it is a new functionality for a routing protocol that only
 supports IPv4 networks.

5.12. RFC 1997 BGP Communities Attribute

 Although the protocol enhancements have no IPv4 dependencies, the
 base protocol, BGP-4, is IPv4 only.

5.13. RFC 2080 RIPng for IPv6

 This RFC documents a protocol for exchanging IPv6 routing information
 and is not discussed in this document.

5.14. RFC 2091 Triggered Extensions to RIP to Support Demand Circuits

 This RFC defines an enhancement for an IPv4 routing protocol and
 while it has no IPv4 dependencies it is inherently limited to IPv4.

5.15. RFC 2338 Virtual Router Redundancy Protocol (VRRP)

 This protocol is IPv4 specific, there are numerous references to 32-
 bit IP addresses.

5.16. RFC 2370 The OSPF Opaque LSA Option

 There are no IPv4 dependencies in this protocol other than the fact
 that it is a new functionality for a routing protocol that only
 supports IPv4 networks.

5.17. RFC 2439 BGP Route Flap Damping

 The protocol enhancements have no IPv4 dependencies, even though the
 base protocol, BGP-4, is IPv4 only routing protocol.

5.18. RFC 2545 Use of BGP-4 Multiprotocol Extensions for IPv6 Inter-

     Domain Routing
 This RFC documents IPv6 routing methods and is not discussed in this
 document.

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5.19. RFC 2740 OSPF for IPv6

 This document defines an IPv6 specific protocol and is not discussed
 in this document.

5.20. RFC 2784 Generic Routing Encapsulation (GRE)

 This protocol is only defined for IPv4.  The document states in the
 Appendix:
    o  IPv6 as Delivery and/or Payload Protocol
 This specification describes the intersection of GRE currently
 deployed by multiple vendors. IPv6 as delivery and/or payload
 protocol is not included.

5.21. RFC 2796 BGP Route Reflection - An Alternative to Full Mesh IBGP

 Although the protocol enhancements have no IPv4 dependencies, the
 base protocol, BGP-4, is IPv4 only routing protocol.  This
 specification updates but does not obsolete RFC 1966.

5.22. RFC 2858 Multiprotocol Extensions for BGP-4

 In the Abstract:
 Currently BGP-4 is capable of carrying routing information only for
 IPv4.  This document defines extensions to BGP-4 to enable it to
 carry routing information for multiple Network Layer protocols (e.g.,
 IPv6, IPX, etc...).  The extensions are backward compatible - a
 router that supports the extensions can interoperate with a router
 that doesn't support the extensions.
 The document is therefore not examined further in this document.

5.23. RFC 2890 Key and Sequence Number Extensions to GRE

 There are no IPv4 dependencies in this protocol.

5.24. RFC 2894 Router Renumbering for IPv6

 The RFC defines an IPv6 only document and is not concerned in this
 survey.

5.25. RFC 2918 Route Refresh Capability for BGP-4

 Although the protocol enhancements have no IPv4 dependencies, the
 base protocol, BGP-4, is IPv4 only routing protocol.

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5.26. RFC 3065 Autonomous System Confederations for BGP

 Although the protocol enhancements have no IPv4 dependencies, the
 base protocol, BGP-4, is IPv4 only routing protocol.

5.27. RFC 3101 The OSPF Not-So-Stubby Area (NSSA) Option

 This document defines an extension to an IPv4 routing protocol.

5.28. RFC 3107 Carrying Label Information in BGP-4

 There are no IPv4 dependencies in this protocol.

5.29. RFC 3122 Extensions to IPv6 Neighbor Discovery for Inverse

    Discovery Specification
 This is an IPv6 related document and is not discussed in this
 document.

6. Experimental RFCs

 Experimental RFCs typically define protocols that do not have wide
 scale implementation or usage on the Internet.  They are often
 propriety in nature or used in limited arenas.  They are documented
 to the Internet community in order to allow potential
 interoperability or some other potential useful scenario.  In a few
 cases they are presented as alternatives to the mainstream solution
 to an acknowledged problem.

6.1. RFC 1075 Distance Vector Multicast Routing Protocol (DVMRP)

 This document defines a protocol for IPv4 multicast routing.

6.2. RFC 1383 An Experiment in DNS Based IP Routing

 This proposal is IPv4 limited:
 This record is designed for easy general purpose extensions in the
 DNS, and its content is a text string.  The RX record will contain
 three fields: A record identifier, A cost indicator, and An IP
 address.

Olvera & Nesser II Informational [Page 7] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

 The three strings will be separated by a single comma.  An example of
 record would thus be:
 ___________________________________________________________________
 |         domain          |   type |   record |   value           |
 |            -            |        |          |                   |
 |*.27.32.192.in-addr.arpa |   IP   |    TXT   |   RX, 10, 10.0.0.7|
 |_________________________|________|__________|___________________|
 which means that for all hosts whose IP address starts by the three
 octets "192.32.27" the IP host "10.0.0.7" can be used as a gateway,
 and that the preference value is 10.

6.3. RFC 1476 RAP: Internet Route Access Protocol

 This document defines an IPv7 routing protocol and has been abandoned
 by the IETF as a feasible design.  It is not considered in this
 document.

6.4. RFC 1765 OSPF Database Overflow

 There are no IPv4 dependencies in this protocol other than the fact
 that it is a new functionality for a routing protocol that only
 supports IPv4 networks.

6.5. RFC 1863 A BGP/IDRP Route Server alternative to a full mesh

    routing
 This protocol is both IPv4 and IPv6 aware and needs no changes.

6.6. RFC 1966 BGP Route Reflection An alternative to full mesh IBGP

 Although the protocol enhancements have no IPv4 dependencies, the
 base protocol, BGP-4, is IPv4 only routing protocol.  This
 specification has been updated by RFC 2796.

6.7. RFC 2189 Core Based Trees (CBT version 2) Multicast Routing

 The document specifies a protocol that depends on IPv4 multicast.
 There are many packet formats defined that show IPv4 usage.

6.8. RFC 2201 Core Based Trees (CBT) Multicast Routing Architecture

 See previous Section for the IPv4 limitation in this protocol.

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6.9. RFC 2337 Intra-LIS IP multicast among routers over ATM using

    Sparse Mode PIM
 This protocol is designed for IPv4 multicast.

6.10. RFC 2362 Protocol Independent Multicast-Sparse Mode (PIM-SM):

    Protocol Specification
 This protocol is both IPv4 and IPv6 aware and needs no changes.

6.11. RFC 2676 QoS Routing Mechanisms and OSPF Extensions

 There are IPv4 dependencies in this protocol.  It requires the use of
 the IPv4 TOS header field.

7. Summary of Results

 In the initial survey of RFCs, 23 positives were identified out of a
 total of 46, broken down as follows:
       Standards:                         3 out of  3 or 100.00%
       Draft Standards:                   1 out of  3 or  33.33%
       Proposed Standards:               13 out of 29 or  44.83%
       Experimental RFCs:                 6 out of 11 or  54.54%
 Of those identified many require no action because they document
 outdated and unused protocols, while others are document protocols
 that are actively being updated by the appropriate working groups.
 Additionally there are many instances of standards that should be
 updated but do not cause any operational impact if they are not
 updated.  The remaining instances are documented below.  The authors
 have attempted to organize the results in a format that allows easy
 reference to other protocol designers.  The assignment of statements
 has been based entirely on the authors perceived needs for updates
 and should not be taken as an official statement.

7.1. Standards

7.1.1. STD 57 RIP Version 2 Protocol Applicability Statement (RFC 1722)

 This problem has been fixed by RFC 2081, RIPng Protocol Applicability
 Statement.

Olvera & Nesser II Informational [Page 9] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

7.1.2. STD 54 OSPF Version 2 (RFC 2328)

 This problem has been fixed by RFC 2740, OSPF for IPv6.

7.1.3. STD 56 RIP Version 2 (RFC 2453)

 This problem has been fixed by RFC 2080, RIPng for IPv6.

7.2. Draft Standards

7.2.1. Border Gateway Protocol 4 (RFC 1771)

 This problem has been fixed in RFC 2858 Multiprotocol Extensions for
 BGP-4, RFC 2545 Use of BGP-4 Multiprotocol Extensions for IPv6
 Inter-Domain Routing, and in [8].
 RFC 2858 extends BGP to support multi-protocol extensions that allows
 routing information for other address families to be exchanged.  RFC
 2545 further extends RFC 2858 for full support of exchanging IPv6
 routing information and additionally clarifies support of the
 extended BGP-4 protocol using TCP+IPv6 as a transport mechanism.  RFC
 1771, 2858 & 2545 must be supported in order to provide full IPv6
 support.
 Note also that all the BGP extensions analyzed previously in this
 memo function without changes with the updated version of BGP-4.

7.3. Proposed Standards

7.3.1. Use of OSI IS-IS for routing in TCP/IP and dual environments

      (RFC 1195)
 This problem is being addressed by the IS-IS WG [9].

7.3.2. Applicability Statement for OSPFv2 (RFC 1370)

 This problem has been resolved in RFC 2740, OSPF for IPv6.

7.3.3. Applicability of CIDR (RFC 1517)

 The contents of this specification has been treated in various IPv6
 addressing architecture RFCs, see RFC 3513 & 3587.

7.3.4. CIDR Architecture (RFC 1518)

 The contents of this specification has been treated in various IPv6
 addressing architecture RFCs, see RFC 3513 & 3587.

Olvera & Nesser II Informational [Page 10] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

7.3.5. Classless Inter-Domain Routing (CIDR): an Address Assignment

      and Aggregation Strategy (RFC 1519)
 The contents of this specification has been treated in various IPv6
 addressing architecture RFCs, see RFC 3513 & 3587.

7.3.6. RIP Extensions for Demand Circuits (RFC 1582)

 This problem has been addressed in RFC 2080, RIPng for IPv6.

7.3.7. OSPF Multicast Extensions (RFC 1584)

 This functionality has been covered in RFC 2740, OSPF for IPv6.

7.3.8. OSPF For Demand Circuits (RFC 1793)

 This functionality has been covered in RFC 2740, OSPF for IPv6.

7.3.9. RIP Triggered Extensions for Demand Circuits (RFC 2091)

 This functionality is provided in RFC 2080, RIPng for IPv6.

7.3.10. Virtual Router Redundancy Protocol (VRRP)(RFC 2338)

 The problems identified are being addressed by the VRRP WG [10].

7.3.11. OSPF Opaque LSA Option (RFC 2370)

 This problem has been fixed by RFC 2740, OSPF for IPv6.  Opaque
 options support is an inbuilt functionality in OSPFv3.

7.3.12. Generic Routing Encapsulation (GRE)(RFC 2784)

 Even though GRE tunneling over IPv6 has been implemented and used,
 its use has not been formally specified.  Clarifications are
 required.

7.3.13. OSPF NSSA Option (RFC 3101)

 This functionality has been covered in RFC 2740, OSPF for IPv6.

7.4. Experimental RFCs

7.4.1. Distance Vector Multicast Routing Protocol (RFC 1075)

 This protocol is a routing protocol for IPv4 multicast routing.  It
 is no longer in use and need not be redefined.

Olvera & Nesser II Informational [Page 11] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

7.4.2. An Experiment in DNS Based IP Routing (RFC 1383)

 This protocol relies on IPv4 DNS RR, but is no longer relevant has
 never seen much use; no action is necessary.

7.4.3. Core Based Trees (CBT version 2) Multicast Routing (RFC 2189)

 This protocol relies on IPv4 IGMP Multicast and a new protocol
 standard may be produced.  However, the multicast routing protocol
 has never been in much use and is no longer relevant; no action is
 necessary.

7.4.4. Core Based Trees (CBT) Multicast Routing Architecture (RFC 2201)

 See previous Section for the limitation in this protocol.

7.4.5. Intra-LIS IP multicast among routers over ATM using Sparse

      Mode PIM (RFC 2337)
 This protocol is designed for IPv4 multicast.  However, Intra-LIS IP
 multicast among routers over ATM is not believed to be relevant
 anymore.  A new mechanism may be defined for IPv6 multicast.

7.4.6. QoS Routing Mechanisms and OSPF Extensions (RFC 2676)

 QoS extensions for OSPF were never used for OSPFv2, and there seems
 to be little need for them in OSPFv3.
 However, if necessary, an update to this document could simply define
 the use of the IPv6 Traffic Class field since it is defined to be
 exactly the same as the IPv4 TOS field.

8. Security Considerations

 This document examines the IPv6-readiness of routing specification;
 this does not have security considerations in itself.

9. Acknowledgements

 The original author, Philip J. Nesser II, would like to acknowledge
 the support of the Internet Society in the research and production of
 this document.
 He also would like to thanks his partner in all ways, Wendy M.
 Nesser.

Olvera & Nesser II Informational [Page 12] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

 Cesar Olvera would like to thanks Pekka Savola for an extended
 guidance and comments for the edition of this document, and Jordi
 Palet for his support and reviews.
 Additionally, he would further like to thank Andreas Bergstrom, Brian
 Carpenter, Jeff Haas, Vishwas Manral, Gabriela Medina, Venkata Naidu,
 Jeff Parker and Curtis Villamizar for valuable feedback.

10. References

10.1. Normative References

 [1]   Nesser, II, P. and A. Bergstrom, Editor, "Introduction to the
       Survey of IPv4 Addresses in Currently Deployed IETF Standards",
       RFC 3789, June 2004.
 [2]   Sofia, R. and P. Nesser, II, "Survey of IPv4 Addresses in
       Currently Deployed IETF Application Area Standards", RFC 3795,
       June 2004.
 [3]   Mickles, C. and P. Nesser, II, "Internet Area: Survey of IPv4
       Addresses Currently Deployed IETF Standards", RFC 3790, June
       2004.
 [4]   Nesser, II, P. and A. Bergstrom, "Survey of IPv4 addresses in
       Currently Deployed IETF Operations & Management Area
       Standards", RFC 3796, June 2004.
 [5]   Nesser, II, P. and A. Bergstrom. "Survey of IPv4 Addresses in
       Currently Deployed IETF Security Area Standards", RFC 3792,
       June 2004.
 [6]   Nesser, II, P. and A. Bergstrom. "Survey of IPv4 Addresses in
       Currently Deployed IETF Sub-IP Area Standards", RFC 3793, June
       2004.
 [7]   Nesser, II, P. and A. Bergstrom "Survey of IPv4 Addresses in
       Currently Deployed IETF Transport Area Standards", RFC 3794,
       June 2004.

10.2. Informative References

 [8]   Chen, E. and J. Yuan, "AS-wide Unique BGP Identifier for BGP-
       4", Work in Progress, December 2003.
 [9]   Hopps, C., "Routing IPv6 with IS-IS", Work in Progress, January
       2003.

Olvera & Nesser II Informational [Page 13] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

 [10]  Hinden, R., "Virtual Router Redundancy Protocol for IPv6", Work
       in Progress, February 2004.

11. Authors' Addresses

 Please contact the authors with any questions, comments or
 suggestions at:
 Cesar Olvera Morales
 Researcher
 Consulintel
 San Jose Artesano, 1
 28108 - Alcobendas
 Madrid, Spain
 Phone: +34 91 151 81 99
 Fax:   +34 91 151 81 98
 EMail: cesar.olvera@consulintel.es
 Philip J. Nesser II
 Principal
 Nesser & Nesser Consulting
 13501 100th Ave NE, #5202
 Kirkland, WA 98034
 Phone: +1 425 481 4303
 EMail: phil@nesser.com

Olvera & Nesser II Informational [Page 14] RFC 3791 IPv4 Addresses in the IETF Routing Area June 2004

12. Full Copyright Statement

 Copyright (C) The Internet Society (2004).  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.
 This document and the information contained herein are provided on an
 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE
 REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE
 INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
 THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

 The IETF takes no position regarding the validity or scope of any
 Intellectual Property Rights or other rights that might be claimed
 to pertain to the implementation or use of the technology
 described in this document or the extent to which any license
 under such rights might or might not be available; nor does it
 represent that it has made any independent effort to identify any
 such rights.  Information on the procedures with respect to
 rights in RFC documents can be found in BCP 78 and BCP 79.
 Copies of IPR disclosures made to the IETF Secretariat and any
 assurances of licenses to be made available, or the result of an
 attempt made to obtain a general license or permission for the use
 of such proprietary rights by implementers or users of this
 specification can be obtained from the IETF on-line IPR repository
 at http://www.ietf.org/ipr.
 The IETF invites any interested party to bring to its attention
 any copyrights, patents or patent applications, or other
 proprietary rights that may cover technology that may be required
 to implement this standard.  Please address the information to the
 IETF at ietf-ipr@ietf.org.

Acknowledgement

 Funding for the RFC Editor function is currently provided by the
 Internet Society.

Olvera & Nesser II Informational [Page 15]

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