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Versions: 00 01 02 03 04                                                
Internet Engineering Task Force                                 H. Singh
Internet-Draft                                                 W. Beebee
Intended status: Informational                       Cisco Systems, Inc.
Expires: January 9, 2011                                       C. Donley
                                                                B. Stark
                                                           O. Troan, Ed.
                                                     Cisco Systems, Inc.
                                                            July 8, 2010

          Advanced Requirements for IPv6 Customer Edge Routers


   This document continues the work undertaken by the IPv6 CE Router
   Phase I work in the IETF v6ops Working Group.  Advanced requirements
   or Phase II work is covered in this document.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   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 http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on January 9, 2011.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Conceptual Configuration Variables . . . . . . . . . . . . . .  4
   4.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . .  4
     4.1.  General Requirements . . . . . . . . . . . . . . . . . . .  4
     4.2.  WAN Side Configuration . . . . . . . . . . . . . . . . . .  5
     4.3.  LAN Side Configuration . . . . . . . . . . . . . . . . . .  6
     4.4.  Security Considerations  . . . . . . . . . . . . . . . . .  8
   5.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  8
   6.  Contributors . . . . . . . . . . . . . . . . . . . . . . . . .  8
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     8.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

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1.  Introduction

   This document defines Advanced IPv6 features for a residential or
   small office router referred to as an IPv6 CE router.  Typically
   these routers also support IPv4.  The IPv6 End-user Network
   Architecture for such a router is described in
   [I-D.ietf-v6ops-ipv6-cpe-router].  This version of the document
   completes the organization of Advanced features between General, WAN,
   and LAN requirements.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  Terminology

   End-user Network          one or more links attached to the IPv6 CE
                             router that connect IPv6 hosts.

   IPv6 Customer Edge router a node intended for home or small office
                             use which forwards IPv6 packets not
                             explicitly addressed to itself.  The IPv6
                             CE router connects the end-user network to
                             a service provider network.

   IPv6 host                 any device implementing an IPv6 stack
                             receiving IPv6 connectivity through the
                             IPv6 CE router

   LAN interface             an IPv6 CE router's attachment to a link in
                             the end-user network.  Examples are
                             Ethernets (simple or bridged), 802.11
                             wireless or other LAN technologies.  An
                             IPv6 CE router may have one or more network
                             layer LAN Interfaces.

   Service Provider          an entity that provides access to the
                             Internet.  In this document, a Service
                             Provider specifically offers Internet
                             access using IPv6, and may also offer IPv4
                             Internet access.  The Service Provider can
                             provide such access over a variety of
                             different transport methods such as DSL,
                             cable, wireless, and others.

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   WAN interface             an IPv6 CE router's attachment to a link
                             used to provide connectivity to the Service
                             Provider network; example link technologies
                             include Ethernets (simple or bridged), PPP
                             links, Frame Relay, or ATM networks as well
                             as Internet-layer (or higher-layer)
                             "tunnels", such as tunnels over IPv4 or
                             IPv6 itself.

3.  Conceptual Configuration Variables

   The CE Router maintains such a list of conceptual optional
   configuration variables.

   1.  Enable RIPng ([RFC2080]) on the LAN.

   2.  Softwire enable.

   3.  More Specifc Route ([RFC4191]) enable and configure routes.

   4.  If DHCPv6 fails, the CE Router may initiate PPPOE, a Softwire
       tunnel, or 6to4 [RFC3056], or 6rd [I-D.ietf-softwire-ipv6-6rd]

   5.  Change ULA on the device.

4.  Requirements

4.1.  General Requirements

   Quality of Service:

   Q-1:  The CPE router MAY support differentiated services [RFC2474].


   D-1:  For local DNS queries for configuration, the CE Router may
         include a DNS server to handle local queries.  Non-local
         queries can be forwarded unchanged to a DNS server specified in
         the DNS server DHCPv6 option.  The CE Router may also include
         DNS64 functionality which is specified in

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   D-2:  The local DNS server MAY also handle renumbering from the
         Service Provider provided prefix for local names used
         exclusively inside the home (the local AAAA and PTR records are
         updated).  This capability provides connectivity using local
         DNS names in the home after a Service Provider renumbering.  A
         CE Router MAY add local DNS entries based on dynamic requests
         from the LAN segment(s).  The protocol to carry such requests
         from hosts to the CE Router is yet to be described.

   The CE Router MAY support manual configuration via the web using a
   URL string like http://router.local as per multicast DNS (mDNS).
   Zero-configuration is vendor-dependent.

   G-1:  TODO if any.

4.2.  WAN Side Configuration

   The IPv6 CE router will need to support connectivity to one or more
   access network architectures.  This document describes an IPv6 CE
   router that is not specific to any particular architecture or Service
   Provider, and supports all commonly used architectures.

   WAN side requirements:

   W-1:  The CE Router WAN interface MUST support a B4 Interface as
         specified in [I-D.ietf-softwire-dual-stack-lite].

   W-2:  The CE Router WAN interface MUST support at least one 6rd
         Virtual Interface as specified in [I-D.ietf-softwire-ipv6-6rd].

   W-3:  The CE Router MUST support an IPv6 firewall feature.

   DHCPV6 requirements:

   WD-1:  The CE Router MUST use a persistent DUID ([RFC3315]) for
          DHCPv6 messages.  The DUID MUST NOT change between network
          interface reset or CE Router reset.

   Multicast requirements:

   WM-1:  Consistent with [RFC4605], the CE router MUST NOT implement
          the router portion of MLDv2 for the WAN interface.

   WM-2:  Multicast data MUST NOT be sent on any softwire tunnel
          operating on the CE Router with transition technologies like
          DS-Lite as specified in [I-D.ietf-softwire-dual-stack-lite].

   Prefix Delegation requirements:

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   WPD-1:  The CE Router is a requesting router and follows [RFC3633]
           for acquiring a delegated prefix from the Service Provider.

   Manageability requirements:

   WPD-1:  TODO.

4.3.  LAN Side Configuration

   Prefix Sub-Delegation requirements:

   LPD-1:  The LAN interface(s) are sub-delegated prefixes subnetted
           from the delegated prefix acquired by the WAN interface.  The
           CE Router MUST support hierarchical prefix delegation for
           automatic sub-delegation in the LAN.  Any other automated
           prefix sub-delegation is vendor dependent.

   CPE Router Behavior in a routed network:

   R-1:  One example of the CPE Router use in the home is shown below.
         The home has a broadband modem combined with a CPE Router, all
         in one device.  The LAN interface of the device is connected to
         another standalone CPE Router that supports a wireless access
         point.  To support such a network, this document recommends
         using prefix sub-delegation of the prefix obtained either via
         IA_PD from WAN interface or a ULA from the LAN interface .  The
         network interface of the downstream router may obtain an IA_PD
         via stateful DHCPv6.  If the CPE router supports the routed
         network through automatic prefix sub-delegation, the CPE router
         MUST support a DHCPv6 server or DHCPv6 relay agent.  Further,
         if an IA_PD is used, the Service Provider or user MUST allocate
         an IA_PD or ULA prefix short enough to be sub-delegated and
         subsequently used for SLAAC.  Therefore, a prefix length
         shorter than /64 is needed.  The CPE Router MAY support RIPng
         in the home network.

                /-------+------------\    /------------+-----\
        SP <--+ Modem | CPE Router    +--+ CPE Router | WAP + --> PC
                \-------+------------/    \------------+-----/

        WAP = Wireless Access Point

                                 Figure 1.

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   R-2:  The CE Router MAY support [RFC4191] on its LAN interfaces.
         Small consumer embedded multi-homed hosts in the home may not
         have configurable routing tables.  The CE Router can
         communicate More Specific Routes (MSRs) to these hosts to allow
         them to choose a preferred router to send traffic to for
         traffic destined to specific prefixes configured through manual
         configuration.  Advertisement of MSRs through RAs is turned off
         by default.

   Multicast Behavior:

   LM-1:  The CPE Router MUST follow the model described for MLD Proxy
          in [RFC4605] to implement multicast.

   LM-2:  Consistent with [RFC4605], the LAN interfaces on the CPE
          router MUST NOT implement an MLDv2 Multicast Listener.

   LM-3:  If the CPE Router hardware includes a network bridge between
          the WAN interface and the LAN interface(s), then the CPE
          Router MUST support MLDv2 snooping as per [RFC4541].

   ND Proxy requirements:

   LNDP-1:  If the CE Router has only one /64 prefix to be used across
            multiple LAN interfaces and the CE Router supports any two
            LAN interfaces that cannot bridge data between them because
            the two interfaces have disparate MAC layers, then the CE
            Router MUST support Proxying Neighbor Advertisements as
            specified in Section 7.2.8 of [RFC4861].  If any two LAN
            interfaces support bridging between the interfaces, then
            Proxying Neighbor Advertisements is not necessary between
            the two interfaces.  Legacy 3GPP networks have the following

            1.  No DHCPv6 prefix is delegated to the CE Router.

            2.  Only one /64 is available on the WAN link.

            3.  The link types between the WAN interface and LAN
                interface(s) are disparate and, therefore, can't be

            4.  No NAT66 is to be used.

            5.  Each LAN interface needs global connectivity.

            6.  Uses SLAAC to configure LAN interface addresses.

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            For these legacy 3GPP networks, the CPE Router MUST support
            ND Proxy between the WAN and LAN interface(s).  If a CE
            Router will never be deployed in an environment with these
            characteristics, then ND Proxy is not necessary.

4.4.  Security Considerations

   Security requirements:

   S-1:  The IPv6 CE router SHOULD support

5.  Acknowledgements

   Thanks to the following people (in alphabetical order) for their
   guidance and feedback:

   Mikael Abrahamsson, Merete Asak, Scott Beuker, Mohamed Boucadair, Rex
   Bullinger, Brian Carpenter, Remi Denis-Courmont, Gert Doering, Alain
   Durand, Katsunori Fukuoka, Tony Hain, Thomas Herbst, Kevin Johns,
   Stephen Kramer, Victor Kuarsingh, Francois-Xavier Le Bail, David
   Miles, Shin Miyakawa, Jean-Francois Mule, Michael Newbery, Carlos
   Pignataro, John Pomeroy, Antonio Querubin, Teemu Savolainen, Matt
   Schmitt, Hiroki Sato, Mark Townsley, Bernie Volz, James Woodyatt, Dan
   Wing and Cor Zwart

   This draft is based in part on CableLabs' eRouter specification.  The
   authors wish to acknowledge the additional contributors from the
   eRouter team:

   Ben Bekele, Amol Bhagwat, Ralph Brown, Eduardo Cardona, Margo Dolas,
   Toerless Eckert, Doc Evans, Roger Fish, Michelle Kuska, Diego
   Mazzola, John McQueen, Harsh Parandekar, Michael Patrick, Saifur
   Rahman, Lakshmi Raman, Ryan Ross, Ron da Silva, Madhu Sudan, Dan
   Torbet and Greg White

6.  Contributors

   The following people have participated as co-authors or provided
   substantial contributions to this document: Ralph Droms, Kirk
   Erichsen, Fred Baker, Jason Weil, Lee Howard, Jean-Francois Tremblay,
   Yiu Lee, John Jason Brzozowski and Heather Kirksey.

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7.  IANA Considerations

   This memo includes no request to IANA.

8.  References

8.1.  Normative References

              Bagnulo, M., Sullivan, A., Matthews, P., Beijnum, I., and
              M. Endo, "DNS64: DNS extensions for Network Address
              Translation from IPv6 Clients to  IPv4 Servers",
              draft-bagnulo-behave-dns64-02 (work in progress),
              March 2009.

              Singh, H., Beebee, W., and E. Nordmark, "IPv6 Subnet
              Model: the Relationship between Links and Subnet
              Prefixes", draft-ietf-6man-ipv6-subnet-model-12 (work in
              progress), April 2010.

              Durand, A., Droms, R., Haberman, B., Woodyatt, J., Lee,
              Y., and R. Bush, "Dual-Stack Lite Broadband Deployments
              Following IPv4 Exhaustion",
              draft-ietf-softwire-dual-stack-lite-04 (work in progress),
              March 2010.

              Townsley, M. and O. Troan, "IPv6 Rapid Deployment on IPv4
              Infrastructures (6rd)", draft-ietf-softwire-ipv6-6rd-10
              (work in progress), May 2010.

              Singh, H., Beebee, W., Donley, C., Stark, B., and O.
              Troan, "Basic Requirements for IPv6 Customer Edge
              Routers", draft-ietf-v6ops-ipv6-cpe-router-06 (work in
              progress), June 2010.

              Vyncke, E. and M. Townsley, "Advanced Security for IPv6
              CPE", draft-vyncke-advanced-ipv6-security-01 (work in
              progress), March 2010.

   [RFC1122]  Braden, R., "Requirements for Internet Hosts -
              Communication Layers", STD 3, RFC 1122, October 1989.

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   [RFC2080]  Malkin, G. and R. Minnear, "RIPng for IPv6", RFC 2080,
              January 1997.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2464]  Crawford, M., "Transmission of IPv6 Packets over Ethernet
              Networks", RFC 2464, December 1998.

   [RFC2474]  Nichols, K., Blake, S., Baker, F., and D. Black,
              "Definition of the Differentiated Services Field (DS
              Field) in the IPv4 and IPv6 Headers", RFC 2474,
              December 1998.

   [RFC2827]  Ferguson, P. and D. Senie, "Network Ingress Filtering:
              Defeating Denial of Service Attacks which employ IP Source
              Address Spoofing", BCP 38, RFC 2827, May 2000.

   [RFC3056]  Carpenter, B. and K. Moore, "Connection of IPv6 Domains
              via IPv4 Clouds", RFC 3056, February 2001.

   [RFC3315]  Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C.,
              and M. Carney, "Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 3315, July 2003.

   [RFC3633]  Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic
              Host Configuration Protocol (DHCP) version 6", RFC 3633,
              December 2003.

   [RFC3646]  Droms, R., "DNS Configuration options for Dynamic Host
              Configuration Protocol for IPv6 (DHCPv6)", RFC 3646,
              December 2003.

   [RFC3736]  Droms, R., "Stateless Dynamic Host Configuration Protocol
              (DHCP) Service for IPv6", RFC 3736, April 2004.

   [RFC4075]  Kalusivalingam, V., "Simple Network Time Protocol (SNTP)
              Configuration Option for DHCPv6", RFC 4075, May 2005.

   [RFC4191]  Draves, R. and D. Thaler, "Default Router Preferences and
              More-Specific Routes", RFC 4191, November 2005.

   [RFC4193]  Hinden, R. and B. Haberman, "Unique Local IPv6 Unicast
              Addresses", RFC 4193, October 2005.

   [RFC4242]  Venaas, S., Chown, T., and B. Volz, "Information Refresh
              Time Option for Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 4242, November 2005.

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   [RFC4294]  Loughney, J., "IPv6 Node Requirements", RFC 4294,
              April 2006.

   [RFC4443]  Conta, A., Deering, S., and M. Gupta, "Internet Control
              Message Protocol (ICMPv6) for the Internet Protocol
              Version 6 (IPv6) Specification", RFC 4443, March 2006.

   [RFC4541]  Christensen, M., Kimball, K., and F. Solensky,
              "Considerations for Internet Group Management Protocol
              (IGMP) and Multicast Listener Discovery (MLD) Snooping
              Switches", RFC 4541, May 2006.

   [RFC4605]  Fenner, B., He, H., Haberman, B., and H. Sandick,
              "Internet Group Management Protocol (IGMP) / Multicast
              Listener Discovery (MLD)-Based Multicast Forwarding
              ("IGMP/MLD Proxying")", RFC 4605, August 2006.

   [RFC4632]  Fuller, V. and T. Li, "Classless Inter-domain Routing
              (CIDR): The Internet Address Assignment and Aggregation
              Plan", BCP 122, RFC 4632, August 2006.

   [RFC4779]  Asadullah, S., Ahmed, A., Popoviciu, C., Savola, P., and
              J. Palet, "ISP IPv6 Deployment Scenarios in Broadband
              Access Networks", RFC 4779, January 2007.

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              September 2007.

   [RFC4862]  Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
              Address Autoconfiguration", RFC 4862, September 2007.

   [RFC4864]  Van de Velde, G., Hain, T., Droms, R., Carpenter, B., and
              E. Klein, "Local Network Protection for IPv6", RFC 4864,
              May 2007.

   [RFC5072]  S.Varada, Haskins, D., and E. Allen, "IP Version 6 over
              PPP", RFC 5072, September 2007.

8.2.  Informative References

              Baker, F., Li, X., Bao, C., and K. Yin, "Framework for
              IPv4/IPv6 Translation",
              draft-ietf-behave-v6v4-framework-09 (work in progress),
              May 2010.


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              UPnP Forum, "Universal Plug and Play (UPnP) Internet
              Gateway Device (IGD)", November 2001,

Authors' Addresses

   Hemant Singh
   Cisco Systems, Inc.
   1414 Massachusetts Ave.
   Boxborough, MA  01719

   Phone: +1 978 936 1622
   Email: shemant@cisco.com
   URI:   http://www.cisco.com/

   Wes Beebee
   Cisco Systems, Inc.
   1414 Massachusetts Ave.
   Boxborough, MA  01719

   Phone: +1 978 936 2030
   Email: wbeebee@cisco.com
   URI:   http://www.cisco.com/

   Chris Donley
   858 Coal Creek Circle
   Louisville, CO  80027

   Email: c.donley@cablelabs.com

   Barbara Stark
   725 W Peachtree St
   Atlanta, GA  30308

   Email: barbara.stark@att.com

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   Ole Troan (editor)
   Cisco Systems, Inc.
   Veversmauet 8
   N-5017 BERGEN,

   Email: ot@cisco.com

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