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Versions: 00 01 RFC 2462

INTERNET-DRAFT                                   Susan Thomson, Bellcore
July 30, 1997                                         Thomas Narten, IBM
<draft-ietf-ipngwg-addrconf-v2-00.txt>                     July 30, 1997

                 IPv6 Stateless Address Autoconfiguration                 |


Status of this Memo

   This document is a submission to the ADDRCONF Working Group of the
   Internet Engineering Task Force (IETF). Comments should be submitted
   to the addrconf@cisco.com mailing list.

   This document is an Internet Draft.  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. Internet Drafts may be updated, replaced, or obsoleted by
   other documents at any time.  It is not appropriate to use Internet
   Drafts as reference material or to cite them other than as a "working
   draft" or "work in progress."

   To learn the current status of any Internet Draft, please check the
   1id-abstracts.txt listing contained in the Internet Drafts Shadow
   Directories on ds.internic.net, nic.nordu.net, ftp.nisc.sri.com or
   munnari.oz.au.

   Distribution of this memo is unlimited.

   This Internet Draft expires February 28, 1998.


Abstract

   This document specifies the steps a host takes in deciding how to
   autoconfigure its interfaces in IP version 6. The autoconfiguration
   process includes creating a link-local address and verifying its
   uniqueness on a link, determining what information should be
   autoconfigured (addresses, other information, or both), and in the
   case of addresses, whether they should be obtained through the
   stateless mechanism, the stateful mechanism, or both.  This document
   defines the process for generating a link-local address, the process
   for generating site-local and global addresses via stateless address
   autoconfiguration, and the Duplicate Address Detection procedure. The



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   details of autoconfiguration using the stateful protocol are
   specified elsewhere.

















































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   Contents

   Status of this Memo..........................................    1     |

   1.  INTRODUCTION.............................................    3     |

   2.  TERMINOLOGY..............................................    5     |
      2.1.  Requirements........................................    9     |

   3.  DESIGN GOALS.............................................    9     |

   4.  PROTOCOL OVERVIEW........................................   10     |
      4.1.  Site Renumbering....................................   12     |

   5.  PROTOCOL SPECIFICATION...................................   13     |
      5.1.  Node Configuration Variables........................   13     |
      5.2.  Autoconfiguration-Related Variables.................   13     |
      5.3.  Creation of Link-Local Addresses....................   14     |
      5.4.  Duplicate Address Detection.........................   15     |
         5.4.1.  Message Validation.............................   16     |
         5.4.2.  Sending Neighbor Solicitation Messages.........   16     |
         5.4.3.  Receiving Neighbor Solicitation Messages.......   17     |
         5.4.4.  Receiving Neighbor Advertisement Messages......   18     |
         5.4.5.  When Duplicate Address Detection Fails.........   18     |
      5.5.  Creation of Global and Site-Local Addresses.........   18     |
         5.5.1.  Soliciting Router Advertisements...............   19     |
         5.5.2.  Absence of Router Advertisements...............   19     |
         5.5.3.  Router Advertisement Processing................   19     |
         5.5.4.  Address Lifetime Expiry........................   21     |
      5.6.  Configuration Consistency...........................   21     |

   6.  SECURITY CONSIDERATIONS..................................   22     |

   7.  References...............................................   22     |

   8.  Acknowledgements.........................................   23     |

   9.  APPENDIX A: LOOPBACK SUPPRESSION & DUPLICATE ADDRESS DETECTION   23|

   10.  APPENDIX B: CHANGES SINCE RFC 1971......................   25     |


1.  INTRODUCTION

   This document specifies the steps a host takes in deciding how to
   autoconfigure its interfaces in IP version 6. The autoconfiguration
   process includes creating a link-local address and verifying its
   uniqueness on a link, determining what information should be



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   autoconfigured (addresses, other information, or both), and in the
   case of addresses, whether they should be obtained through the
   stateless mechanism, the stateful mechanism, or both.  This document
   defines the process for generating a link-local address, the process
   for generating site-local and global addresses via stateless address
   autoconfiguration, and the Duplicate Address Detection procedure. The
   details of autoconfiguration using the stateful protocol are
   specified elsewhere.

   IPv6 defines both a stateful and stateless address autoconfiguration
   mechanism. Stateless autoconfiguration requires no manual
   configuration of hosts, minimal (if any) configuration of routers,
   and no additional servers.  The stateless mechanism allows a host to
   generate its own addresses using a combination of locally available
   information and information advertised by routers. Routers advertise
   prefixes that identify the subnet(s) associated with a link, while     |
   hosts generate an "interface identifier" that uniquely identifies an
   interface on a subnet. An address is formed by combining the two. In
   the absence of routers, a host can only generate link-local
   addresses. However, link-local addresses are sufficient for allowing
   communication among nodes attached to the same link.

   In the stateful autoconfiguration model, hosts obtain interface
   addresses and/or configuration information and parameters from a
   server.  Servers maintain a database that keeps track of which
   addresses have been assigned to which hosts. The stateful
   autoconfiguration protocol allows hosts to obtain addresses, other
   configuration information or both from a server.  Stateless and
   stateful autoconfiguration complement each other. For example, a host
   can use stateless autoconfiguration to configure its own addresses,
   but use stateful autoconfiguration to obtain other information.
   Stateful autoconfiguration is described in [DHCPv6].

   The stateless approach is used when a site is not particularly
   concerned with the exact addresses hosts use, so long as they are
   unique and properly routable. The stateful approach is used when a
   site requires tighter control over exact address assignments.  Both
   stateful and stateless address autoconfiguration may be used
   simultaneously.  The site administrator specifies which type of
   autoconfiguration to use through the setting of appropriate fields in
   Router Advertisement messages [DISCOVERY].

   IPv6 addresses are leased to an interface for a fixed (possibly
   infinite) length of time. Each address has an associated lifetime
   that indicates how long the address is bound to an interface. When a
   lifetime expires, the binding (and address) become invalid and the
   address may be reassigned to another interface elsewhere in the
   Internet. To handle the expiration of address bindings gracefully, an



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   address goes through two distinct phases while assigned to an
   interface. Initially, an address is "preferred", meaning that its use
   in arbitrary communication is unrestricted. Later, an address becomes
   "deprecated" in anticipation that its current interface binding will
   become invalid. While in a deprecated state, the use of an address is
   discouraged, but not strictly forbidden.  New communication (e.g.,
   the opening of a new TCP connection) should use a preferred address
   when possible.  A deprecated address should be used only by
   applications that have been using it and would have difficulty
   switching to another address without a service disruption.

   To insure that all configured addresses are likely to be unique on a
   given link, nodes run a "duplicate address detection" algorithm on
   addresses before assigning them to an interface.  The Duplicate
   Address Detection algorithm is performed on all addresses,
   independent of whether they are obtained via stateless or stateful
   autoconfiguration. This document defines the Duplicate Address
   Detection algorithm.

   The autoconfiguration process specified in this document applies only
   to hosts and not routers. Since host autoconfiguration uses
   information advertised by routers, routers will need to be configured
   by some other means. However, it is expected that routers will
   generate link-local addresses using the mechanism described in this
   document. In addition, routers are expected to successfully pass the
   Duplicate Address Detection procedure described in this document on
   all addresses prior to assigning them to an interface.

   Section 2 provides definitions for terminology used throughout this
   document. Section 3 describes the design goals that lead to the
   current autoconfiguration procedure. Section 4 provides an overview
   of the protocol, while Section 5 describes the protocol in detail.


2.  TERMINOLOGY

      IP          - Internet Protocol Version 6.  The terms IPv4 and
                    IPv6 are used only in contexts where necessary to
                    avoid ambiguity.

      node        - a device that implements IP.

      router      - a node that forwards IP packets not explicitly
                    addressed to itself.

      host        - any node that is not a router.

      upper layer - a protocol layer immediately above IP.  Examples are



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                    transport protocols such as TCP and UDP, control
                    protocols such as ICMP, routing protocols such as
                    OSPF, and internet or lower-layer protocols being
                    "tunneled" over (i.e., encapsulated in) IP such as
                    IPX, AppleTalk, or IP itself.

      link        - a communication facility or medium over which nodes
                    can communicate at the link layer, i.e., the layer
                    immediately below IP.  Examples are Ethernets
                    (simple or bridged); PPP links; X.25, Frame Relay,
                    or ATM networks; and internet (or higher) layer
                    "tunnels", such as tunnels over IPv4 or IPv6 itself.

      interface   - a node's attachment to a link.

      packet      - an IP header plus payload.

      address     - an IP-layer identifier for an interface or a set of
                    interfaces.

      unicast address
                  - an identifier for a single interface. A packet sent
                    to a unicast address is delivered to the interface
                    identified by that address.

      multicast address
                  - an identifier for a set of interfaces (typically
                    belonging to different nodes). A packet sent to a
                    multicast address is delivered to all interfaces
                    identified by that address.

      anycast address
                  - an identifier for a set of interfaces (typically
                    belonging to different nodes).  A packet sent to an
                    anycast address is delivered to one of the
                    interfaces identified by that address (the "nearest"
                    one, according to the routing protocol's measure of
                    distance).  See [ADDR-ARCH].

      solicited-node multicast address
                  - a multicast address to which Neighbor Solicitation
                    messages are sent. The algorithm for computing the
                    address is given in [DISCOVERY].

      link-layer address
                  - a link-layer identifier for an interface.  Examples
                    include IEEE 802 addresses for Ethernet links and
                    E.164 addresses for ISDN links.



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      link-local address
                  - an address having link-only scope that can be used
                    to reach neighboring nodes attached to the same
                    link.  All interfaces have a link-local unicast
                    address.

      site-local address
                  - an address having scope that is limited to the local
                    site.

      global address
                  - an address with unlimited scope.

      communication
                  - any packet exchange among nodes that requires that
                    the address of each node used in the exchange remain
                    the same for the duration of the packet exchange.
                    Examples are a TCP connection or a UDP request-
                    response.

      tentative address
                  - an address whose uniqueness on a link is being
                    verified, prior to its assignment to an interface.
                    A tentative address is not considered assigned to an
                    interface in the usual sense. An interface discards
                    received packets addressed to a tentative address,
                    but accepts Neighbor Discovery packets related to
                    Duplicate Address Detection for the tentative
                    address.

      preferred address
                  - an address assigned to an interface whose use by
                    upper layer protocols is unrestricted. Preferred
                    addresses may be used as the source (or destination)
                    address of packets sent from (or to) the interface.

      deprecated address
                  - An address assigned to an interface whose use is
                    discouraged, but not forbidden.  A deprecated
                    address should no longer be used as a source address  |
                    in new communications, but packets sent from or to    |
                    deprecated addresses are delivered as expected.  A
                    deprecated address may continue to be used as a
                    source address in communications where switching to
                    a preferred address causes hardship to a specific
                    upper-layer activity (e.g., an existing TCP
                    connection).




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      valid address
                  - a preferred or deprecated address. A valid address
                    may appear as the source or destination address of a
                    packet, and the internet routing system is expected   |
                    to deliver packets sent to a valid address to their   |
                    intended recipients.

      invalid address
                  - an address that is not assigned to any interface. A
                    valid address becomes invalid when its valid
                    lifetime expires.  Invalid addresses should not
                    appear as the   destination or source address of a
                    packet. In the former case, the internet routing
                    system will be unable to deliver the packet, in the
                    later case the recipient of the packet will be
                    unable to respond to it.

      preferred lifetime
                  - the length of time that a valid address is preferred
                    (i.e., the time until deprecation). When the
                    preferred lifetime expires, the address becomes
                    deprecated.

      valid lifetime
                  - the length of time an address remains in the valid
                    state (i.e., the time until invalidation). The valid
                    lifetime must be greater then or equal to the
                    preferred lifetime.  When the valid lifetime
                    expires, the address becomes invalid.

      interface identifier                                                |
                  - a link-dependent identifier for an interface that is
                    (at least) unique per link [ADDR-ARCH]. Stateless     |
                    address autoconfiguration combines an interface       |
                    identifier with a prefix to form an address. From     |
                    address autoconfiguration's perspective, an           |
                    interface identifier is a bit string of known         |
                    length.  The exact length of an interface identifier  |
                    and the way it is created is defined in a separate    |
                    link-type specific document that covers issues        |
                    related to the transmission of IP over a particular   |
                    link type (e.g., [IPv6-ETHER]).  In many cases, the   |
                    identifier will be the same as the interface's        |
                    link-layer address.







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2.1.  Requirements                                                        *

   The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,       |
   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this   |
   document, are to be interpreted as described in [KEYWORDS].


3.  DESIGN GOALS

   Stateless autoconfiguration is designed with the following goals in
   mind:

      o Manual configuration of individual machines before connecting
        them to the network should not be required. Consequently, a
        mechanism is needed that allows a host to obtain or create
        unique addresses for each of its interfaces. Address
        autoconfiguration assumes that each interface can provide a
        unique identifier for that interface (i.e., an "interface         |
        identifier").  In the simplest case, an interface identifier      |
        consists of the interface's link-layer address. An interface      |
        identifier can be combined with a prefix to form an address.

      o Small sites consisting of a set of machines attached to a single
        link should not require the presence of a stateful server or
        router as a prerequisite for communicating.  Plug-and-play
        communication is achieved through the use of link-local
        addresses.  Link-local addresses have a well-known prefix that
        identifies the (single) shared link to which a set of nodes
        attach. A host forms a link-local address by appending its        |
        interface identifier to the link-local prefix.

      o A large site with multiple networks and routers should not
        require the presence of a stateful address configuration server.
        In order to generate site-local or global addresses, hosts must
        determine the prefixes that identify the subnets to which they
        attach.  Routers generate periodic Router Advertisements that
        include options listing the set of active prefixes on a link.

      o Address configuration should facilitate the graceful renumbering
        of a site's machines. For example, a site may wish to renumber
        all of its nodes when it switches to a new network service
        provider.  Renumbering is achieved through the leasing of
        addresses to interfaces and the assignment of multiple addresses
        to the same interface.  Lease lifetimes provide the mechanism
        through which a site phases out old prefixes.  The assignment of
        multiple addresses to an interface provides for a transition
        period during which both a new address and the one being phased
        out work simultaneously.



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      o System administrators need the ability to specify whether
        stateless autoconfiguration, stateful autoconfiguration, or both
        should be used.  Router Advertisements include flags specifying
        which mechanisms a host should use.


4.  PROTOCOL OVERVIEW

   This section provides an overview of the typical steps that take
   place when an interface autoconfigures itself.  Autoconfiguration is
   performed only on multicast-capable links and begins when a
   multicast-capable interface is enabled, e.g., during system startup.
   Nodes (both hosts and routers) begin the autoconfiguration process by
   generating a link-local address for the interface. A link-local        |
   address is formed by appending the interface's identifier to the
   well-known link-local prefix.

   Before the link-local address can be assigned to an interface and
   used, however, a node must attempt to verify that this "tentative"
   address is not already in use by another node on the link.
   Specifically, it sends a Neighbor Solicitation message containing the
   tentative address as the target. If another node is already using
   that address, it will return a Neighbor Advertisement saying so. If
   another node is also attempting to use the same address, it will send
   a Neighbor Solicitation for the target as well. The exact number of
   times the Neighbor Solicitation is (re)transmitted and the delay time
   between consecutive solicitations is link-specific and may be set by
   system management.

   If a node determines that its tentative link-local address is not
   unique, autoconfiguration stops and manual configuration of the
   interface is required.  To simplify recovery in this case, it should
   be possible for an administrator to supply an alternate interface      |
   identifier that overrides the default identifier in such a way that    |
   the autoconfiguration mechanism can then be applied using the new      |
   (presumably unique) interface identifier.  Alternatively, link-local   |
   and other addresses will need to be configured manually.

   Once a node ascertains that its tentative link-local address is
   unique, it assigns it to the interface. At this point, the node has
   IP-level connectivity with neighboring nodes.  The remaining
   autoconfiguration steps are performed only by hosts; the
   (auto)configuration of routers is beyond the scope of this document.

   The next phase of autoconfiguration involves obtaining a Router
   Advertisement or determining that no routers are present. If routers
   are present, they will send Router Advertisements that specify what
   sort of autoconfiguration a host should do.  If no routers are



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   present, stateful autoconfiguration should be invoked.

   Routers send Router Advertisements periodically, but the delay
   between successive advertisements will generally be longer than a
   host performing autoconfiguration will want to wait [DISCOVERY].  To
   obtain an advertisement quickly, a host sends one or more Router
   Solicitations to the all-routers multicast group.  Router
   Advertisements contain two flags indicating what type of stateful
   autoconfiguration (if any) should be performed. A "managed address
   configuration" flag indicates whether hosts should use stateful
   autoconfiguration to obtain addresses. An "other stateful
   configuration" flag indicates whether hosts should use stateful
   autoconfiguration to obtain additional information (excluding
   addresses).

   Router Advertisements also contain zero or more Prefix Information
   options that contain information used by stateless address
   autoconfiguration to generate site-local and global addresses.  It
   should be noted that the stateless and stateful address
   autoconfiguration fields in Router Advertisements are processed
   independently of one another, and a host may use both stateful and
   stateless address autoconfiguration simultaneously.  One Prefix
   Information option field, the "autonomous address-configuration
   flag", indicates whether or not the option even applies to stateless
   autoconfiguration.  If it does, additional option fields contain a
   subnet prefix together with lifetime values indicating how long
   addresses created from the prefix remain preferred and valid.

   Because routers generate Router Advertisements periodically, hosts
   will continually receive new advertisements. Hosts process the
   information contained in each advertisement as described above,
   adding to and refreshing information received in previous
   advertisements.

   For safety, all addresses must be tested for uniqueness prior to
   their assignment to an interface.  In the case of addresses created
   through stateless autoconfig, however, the uniqueness of an address
   is determined primarily by the portion of the address formed from an   |
   interface identifier.  Thus, if a node has already verified the        |
   uniqueness of a link-local address, additional addresses created from
   the same interface identifier need not be tested individually. In      |
   contrast, all addresses obtained manually or via stateful address
   autoconfiguration should be tested for uniqueness individually. To
   accommodate sites that believe the overhead of performing Duplicate
   Address Detection outweighs its benefits, the use of Duplicate
   Address Detection can be disabled through the administrative setting
   of a per-interface configuration flag.




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   To speed the autoconfiguration process, a host may generate its
   link-local address (and verify its uniqueness) in parallel with
   waiting for a Router Advertisement. Because a router may delay
   responding to a Router Solicitation for a few seconds, the total time
   needed to complete autoconfiguration can be significantly longer if
   the two steps are done serially.


4.1.  Site Renumbering

   Address leasing facilitates site renumbering by providing a mechanism
   to time-out addresses assigned to interfaces in hosts.  At present,
   upper layer protocols such as TCP provide no support for changing
   end-point addresses while a connection is open. If an end-point
   address becomes invalid, existing connections break and all
   communication to the invalid address fails.  Even when applications
   use UDP as a transport protocol, addresses must generally remain the
   same during a packet exchange.

   Dividing valid addresses into preferred and deprecated categories
   provides a way of indicating to upper layers that a valid address may
   become invalid shortly and that future communication using the
   address will fail, should the address's valid lifetime expire before
   communication ends.  To avoid this scenario, higher layers should use
   a preferred address (assuming one of sufficient scope exists) to
   increase the likelihood that an address will remain valid for the
   duration of the communication.  It is up to system administrators to
   set appropriate prefix lifetimes in order to minimize the impact of
   failed communication when renumbering takes place.  The deprecation
   period should be long enough that most, if not all, communications
   are using the new address at the time an address becomes invalid.

   The IP layer is expected to provide a means for upper layers
   (including applications) to select the most appropriate source
   address given a particular destination and possibly other
   constraints.  An application may choose to select the source address
   itself before starting a new communication or may leave the address
   unspecified, in which case the upper networking layers will use the
   mechanism provided by the IP layer to choose a suitable address on
   the application's behalf.

   Detailed address selection rules are beyond the scope of this
   document.








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5.  PROTOCOL SPECIFICATION

   Autoconfiguration is performed on a per-interface basis on
   multicast-capable interfaces.  For multihomed hosts,
   autoconfiguration is performed independently on each interface.
   Autoconfiguration applies primarily to hosts, with two exceptions.
   Routers are expected to generate a link-local address using the
   procedure outlined below. In addition, routers perform Duplicate
   Address Detection on all addresses prior to assigning them to an
   interface.


5.1.  Node Configuration Variables

   A node MUST allow the following autoconfiguration-related variable to
   be configured by system management for each multicast interface:

        DupAddrDetectTransmits

                       The number of consecutive Neighbor Solicitation
                       messages sent while performing Duplicate Address
                       Detection on a tentative address. A value of zero
                       indicates that Duplicate Address Detection is not
                       performed on tentative addresses. A value of one
                       indicates a single transmission with no follow up
                       retransmissions.

                       Default: 1, but may be overridden by a link-type
                       specific value in the document that covers issues
                       related to the transmission of IP over a
                       particular link type (e.g., [IPv6-ETHER]).

                       Autoconfiguration also assumes the presence of
                       the variable RetransTimer as defined in
                       [DISCOVERY]. For autoconfiguration purposes,
                       RetransTimer specifies the delay between
                       consecutive Neighbor Solicitation transmissions
                       performed during Duplicate Address Detection (if
                       DupAddrDetectTransmits is greater than 1), as
                       well as the time a node waits  after sending the
                       last Neighbor Solicitation before ending the
                       Duplicate Address Detection process.


5.2.  Autoconfiguration-Related Variables

   A host maintains a number of data structures and flags related to
   autoconfiguration. In the following, we present conceptual variables



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   and show how they are used to perform autoconfiguration. The specific
   variables are used for demonstration purposes only, and an
   implementation is not required to have them, so long as its external
   behavior is consistent with that described in this document.

   Beyond the formation of a link-local address and using Duplicate
   Address Detection, how routers (auto)configure their interfaces is
   beyond the scope of this document.

   Hosts maintain the following variables on a per-interface basis:

      ManagedFlag      Copied from the M flag field (i.e., the "managed
                       address configuration" flag) of the most recently
                       received Router Advertisement message. The flag
                       indicates whether or not addresses are to be
                       configured using the stateful autoconfiguration
                       mechanism. It starts out in a FALSE state.

      OtherConfigFlag  Copied from the O flag field (i.e., the "other
                       stateful configuration" flag) of the most
                       recently received Router Advertisement message.
                       The flag indicates whether or not information
                       other than addresses are to be obtained using the
                       stateful autoconfiguration mechanism. It starts
                       out in a FALSE state.

   A host also maintains a list of addresses together with their
   corresponding lifetimes. The address list contains both
   autoconfigured addresses and those configured manually.


5.3.  Creation of Link-Local Addresses

   A node forms a link-local address whenever an interface becomes
   enabled.  An interface may become enabled after any of the following
   events:

      - The interface is initialized at system startup time.

      - The interface is reinitialized after a temporary interface
        failure or after being temporarily disabled by system
        management.

      - The interface attaches to a link for the first time.

      - The interface becomes enabled by system management after having
        been administratively disabled.




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   A link-local address is formed by prepending the well-known link-
   local prefix FE80::0 [ADDR-ARCH] (of appropriate length) to the
   interface identifier. If the interface identifier has a length of N    |
   bits, the interface identifier replaces the right-most N zero bits of  |
   the link-local prefix.  If the interface identifier is more than 118   |
   bits in length, autoconfiguration fails and manual configuration is
   required.

   A link-local address has an infinite preferred and valid lifetime; it
   is never timed out.


5.4.  Duplicate Address Detection

   Duplicate Address Detection is performed on unicast addresses prior    |
   to assigning them to an interface whose DupAddrDetectTransmits         |
   variable is greater than zero. Duplicate Address Detection MUST take   |
   place on on all unicast addresses, regardless of whether they are
   obtained through stateful, stateless or manual configuration, with     |
   the exception of the following cases:                                  |
      - Duplicate Address Detection MUST NOT be performed on anycast      |
        addresses.                                                        |
      - Each individual unicast address SHOULD be tested for uniqueness.  |
        However, when stateless address autoconfiguration is used,        |
        address uniqueness is determined solely by the interface          |
        identifier, assuming that subnet prefixes are assigned correctly  |
        (i.e., if all of an interface's addresses are generated from the  |
        same identifier, either all addresses or none of them will be     |
        duplicates). Thus, for a set of addresses formed from the same    |
        interface identifier, it is sufficient to check that the link-    |
        local address generated from the identifier is unique on the      |
        link. In such cases, the link-local address MUST be tested for    |
        uniqueness, and if no duplicate address is detected, an           |
        implementation MAY choose to skip Duplicate Address Detection     |
        for additional addresses derived from the same interface          |
        identifier.                                                       |

   The procedure for detecting duplicate addresses uses Neighbor
   Solicitation and Advertisement messages as described below. If a
   duplicate address is discovered during the procedure, the address
   cannot be assigned to the interface. If the address is derived from
   an interface identifier, a new identifier will need to be assigned to  |
   the interface, or all IP addresses for the interface will need to be
   manually configured.  Note that the method for detecting duplicates
   is not completely reliable, and it is possible that duplicate
   addresses will still exist (e.g., if the link was partitioned while
   Duplicate Address Detection was performed).




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   An address on which the duplicate Address Detection Procedure is
   applied is said to be tentative until the procedure has completed
   successfully.  A tentative address is not considered "assigned to an
   interface" in the traditional sense. That is, the interface must
   accept Neighbor Solicitation and Advertisement messages containing
   the tentative address in the Target Address field, but processes such
   packets differently from those whose Target Address matches an
   address assigned to the interface. Other packets addressed to the
   tentative address should be silently discarded.

   It should also be noted that Duplicate Address Detection must be
   performed prior to assigning an address to an interface in order to
   prevent multiple nodes from using the same address simultaneously.
   If a node begins using an address in parallel with Duplicate Address
   Detection, and another node is already using the address, the node
   performing Duplicate Address Detection will erroneously process
   traffic intended for the other node, resulting in such possible
   negative consequences as the resetting of open TCP connections.

   The following subsections describe specific tests a node performs to
   verify an address's uniqueness.  An address is considered unique if
   none of the tests indicate the presence of a duplicate address within
   RetransTimer milliseconds after having sent DupAddrDetectTransmits
   Neighbor Solicitations. Once an address is determined to be unique,
   it may be assigned to an interface.


5.4.1.  Message Validation

   A node MUST silently discard any Neighbor Solicitation or
   Advertisement message that does not pass the validity checks
   specified in [DISCOVERY]. A solicitation that passes these validity
   checks is called a valid solicitation or valid advertisement.


5.4.2.  Sending Neighbor Solicitation Messages

   Before sending a Neighbor Solicitation, an interface MUST join the
   all-nodes multicast address and the solicited-node multicast address
   of the tentative address.  The former insures that the node receives
   Neighbor Advertisements from other nodes already using the address;
   the latter insures that two nodes attempting to use the same address
   simultaneously detect each other's presence.

   To check an address, a node sends DupAddrDetectTransmits Neighbor
   Solicitations, each separated by RetransTimer milliseconds. The
   solicitation's Target Address is set to the address being checked,
   the IP source is set to the unspecified address and the IP



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   destination is set to the solicited-node multicast address of the
   target address.

   If the Neighbor Solicitation is the first message to be sent from an
   interface after interface (re)initialization, the node should delay
   sending the message by a random delay between 0 and
   MAX_RTR_SOLICITATION_DELAY as specified in [DISCOVERY].  This serves
   to alleviate congestion when many nodes start up on the link at the
   same time, such as after a power failure, and may help to avoid race
   conditions when more than one node is trying to solicit for the same
   address at the same time. In order to improve the robustness of the
   Duplicate Address Detection algorithm, an interface MUST receive and
   process datagrams sent to the all-nodes multicast address or
   solicited-node multicast address of the tentative address while
   delaying transmission of the initial Neighbor Solicitation.




5.4.3.  Receiving Neighbor Solicitation Messages

   On receipt of a valid Neighbor Solicitation message on an interface,
   node behavior depends on whether the target address is tentative or
   not.  If the target address is not tentative (i.e., it is assigned to
   the receiving interface), the solicitation is processed as described
   in [DISCOVERY].  If the target address is tentative, and the source
   address is a unicast address, the solicitation's sender is performing
   address resolution on the target; the solicitation should be silently
   ignored.  Otherwise, processing takes place as described below. In
   all cases, a node MUST NOT respond to a Neighbor Solicitation for a
   tentative address.

   If the source address of the Neighbor Solicitation is the unspecified
   address, the solicitation is from a node performing Duplicate Address
   Detection. If the solicitation is from another node, the tentative
   address is a duplicate and should not be used (by either node). If
   the solicitation is from the node itself (because the node loops back
   multicast packets), the solicitation does not indicate the presence
   of a duplicate address.

   Implementor's Note: many interfaces provide a way for upper layers to
   selectively enable and disable the looping back of multicast packets.
   The details of how such a facility is implemented may prevent
   Duplicate Address Detection from working correctly.  See the Appendix
   for further discussion.

   The following tests identify conditions under which a tentative
   address is not unique:



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      - If a Neighbor Solicitation for a tentative address is received
        prior to having sent one, the tentative address is a duplicate.
        This condition occurs when two nodes run Duplicate Address
        Detection simultaneously, but transmit initial solicitations at
        different times (e.g., by selecting different random delay
        values before transmitting an initial solicitation).

      - If the actual number of Neighbor Solicitations received exceeds
        the number expected based on the loopback semantics (e.g., the
        interface does not loopback packet, yet one or more
        solicitations was received), the tentative address is a
        duplicate. This condition occurs when two nodes run Duplicate
        Address Detection simultaneously and transmit solicitations at
        roughly the same time.


5.4.4.  Receiving Neighbor Advertisement Messages

   On receipt of a valid Neighbor Advertisement message on an interface,
   node behavior depends on whether the target address is tentative or
   matches a unicast or anycast address assigned to the interface.  If
   the target address is assigned to the receiving interface, the
   solicitation is processed as described in [DISCOVERY]. If the target
   address is tentative, the tentative address is not unique.


5.4.5.  When Duplicate Address Detection Fails

   A tentative address that is determined to be a duplicate as described
   above, MUST NOT be assigned to an interface and the node SHOULD log a
   system management error.  If the address is a link-local address       |
   formed from an interface identifier, the interface SHOULD be           |
   disabled.


5.5.  Creation of Global and Site-Local Addresses

   Global and site-local addresses are formed by appending an interface   |
   identifier to a prefix of appropriate length. Prefixes are obtained    |
   from Prefix Information options contained in Router Advertisements.
   Creation of global and site-local addresses and configuration of
   other parameters as described in this section SHOULD be locally
   configurable. However, the processing described below MUST be enabled
   by default.







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5.5.1.  Soliciting Router Advertisements

   Router Advertisements are sent periodically to the all-nodes
   multicast address. To obtain an advertisement quickly, a host sends
   out Router Solicitations as described in [DISCOVERY].


5.5.2.  Absence of Router Advertisements

   If a link has no routers, a host MUST attempt to use stateful
   autoconfiguration to obtain addresses and other configuration
   information. An implementation MAY provide a way to disable the
   invocation of stateful autoconfiguration in this case, but the
   default SHOULD be enabled.  From the perspective of
   autoconfiguration, a link has no routers if no Router Advertisements
   are received after having sent a small number of Router Solicitations
   as described in [DISCOVERY].


5.5.3.  Router Advertisement Processing

   On receipt of a valid Router Advertisement (as defined in
   [DISCOVERY]), a host copies the value of the advertisement's M bit
   into ManagedFlag. If the value of ManagedFlag changes from FALSE to
   TRUE, the host should invoke the stateful address autoconfiguration
   protocol, requesting address information.  If the value of the
   ManagedFlag changes from TRUE to FALSE, the host should terminate the
   stateful address autoconfiguration protocol (i.e., stop requesting
   addresses and ignore subsequent responses to in-progress
   transactions). If the value of the flag stays unchanged, no special
   action takes place. In particular, a host MUST NOT reinvoke stateful
   address configuration if it is already participating in the stateful
   protocol as a result of an earlier advertisement.

   An advertisement's O flag field is processed in an analogous manner.
   A host copies the value of the O flag into OtherConfigFlag. If the
   value of OtherConfigFlag changes from FALSE to TRUE, the host should
   invoke the stateful autoconfiguration protocol, requesting
   information (excluding addresses).  If the value of the
   OtherConfigFlag changes from TRUE to FALSE, any activity related to
   stateful autoconfiguration for parameters other than addresses should
   be halted. If the value of the flag stays unchanged, no special
   action takes place. In particular, a host MUST NOT reinvoke stateful
   configuration if it is already participating in the stateful protocol
   as a result of an earlier advertisement.

   For each Prefix-Information option in the Router Advertisement:




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    a) If the Autonomous flag is not set, silently ignore the Prefix
       Information option.

    b) If the prefix is the link-local prefix, silently ignore the
       Prefix Information option.

    c) If the preferred lifetime is greater than the valid lifetime,
       silently ignore the Prefix Information option. A node MAY wish to
       log a system management error in this case.

    d) If the prefix advertised matches the prefix of an autoconfigured   |
       address (i.e., one obtained previously via stateless or stateful   |
       autoconfiguration) in the list of addresses associated with the    |
       interface, and the valid lifetime in the received RA is both less  |
       than 2 hours and less than the remaining valid Lifetime in the     |
       cached entry, ignore the Prefix Information option for the         |
       purpose of stateless address autoconfiguration.                    |

    f) If the prefix advertised matches the prefix of an autoconfigured   |
       address (i.e., one obtained previously via stateless or stateful   |
       autoconfiguration) in the list of addresses associated with the    |
       interface, and the preferred lifetime in the received RA is both   |
       less than 2 hours and less than the remaining preferred Lifetime   |
       in the cached entry, ignore the Prefix Information option for the  |
       purpose of stateless address autoconfiguration.                    |

    g) If the advertised prefix matches the prefix of an autoconfigured
       address (i.e., obtained via stateless or stateful address
       autoconfiguration) in the list of addresses associated with the
       interface, set the preferred timer to that of the option's
       preferred lifetime, and set the valid lifetime to that of the
       option's valid lifetime.

    h) If the prefix advertised does not match the prefix of an address   |
       already in the list, then form an address (and add it to the
       list) by appending the interface identifier to the prefix as       |
       follows:

       |            128 - N bits               |       N bits           |
       +---------------------------------------+------------------------+
       |            link prefix                |  interface identifier  | |
       +----------------------------------------------------------------+


       If the sum of the prefix length and interface identifier length    |
       does not equal 128 bits, the Prefix Information option MUST be
       ignored. An implementation MAY wish to log a system management
       error in this case. It is the responsibility of the system



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       administrator to insure that the lengths of prefixes contained in
       Router Advertisements are consistent with the length of interface  |
       identifiers for that link type.

       In those cases where a site requires the use of longer prefixes
       than can be accommodated by the interface identifier, stateful     |
       autoconfiguration can be used.                                     |

       If an address is formed successfully, the host adds it to the
       list of addresses assigned to the interface, initializing its
       preferred and valid lifetime values from the Prefix Information
       option.


5.5.4.  Address Lifetime Expiry

   A preferred address becomes deprecated when its preferred lifetime
   expires.  A deprecated address SHOULD continue to be used as a source
   address in existing communications, but SHOULD NOT be used in new
   communications if an alternate (non-deprecated) address is available   |
   and has sufficient scope.  IP and higher layers (e.g., TCP, UDP) MUST  |
   continue to accept datagrams destined to a deprecated address since a
   deprecated address is still a valid address for the interface. An
   implementation MAY prevent any new communication from using a
   deprecated address, but system management MUST have the ability to     |
   disable such a facility, and the facility MUST be disabled by          |
   default.

   An address (and its association with an interface) becomes invalid
   when its valid lifetime expires.  An invalid address MUST NOT be used
   as a source address in outgoing communications and MUST NOT be
   recognized as a destination on a receiving interface.

   Note that if a Prefix Information option is received with a preferred
   lifetime of zero, any addresses generated from that prefix are
   immediately deprecated. Similarly, if both the advertised deprecated
   and valid lifetimes are zero, any addresses generated from that
   prefix become invalid immediately.


5.6.  Configuration Consistency

   It is possible for hosts to obtain address information using both
   stateless and stateful protocols since both may be enabled at the
   same time.  It is also possible that the values of other
   configuration parameters such as MTU size and hop limit will be
   learned from both Router Advertisements and the stateful
   autoconfiguration protocol.  If the same configuration information is



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   provided by multiple sources, the value of this information should be
   consistent. However, it is not considered a fatal error if
   information received from multiple sources is inconsistent. Hosts
   accept the union of all information received via the stateless and
   stateful protocols. If inconsistent information is learned from
   different sources, the most recently obtained values always have
   precedence over information learned earlier.


6.  SECURITY CONSIDERATIONS

   Stateless address autoconfiguration allows a host to connect to a
   network, configure an address and start communicating with other
   nodes without ever registering or authenticating itself with the
   local site. Although this allows unauthorized users to connect to and
   use a network, the threat is inherently present in the Internet
   architecture. Any node with a physical attachment to a network can
   generate an address (using a variety of ad hoc techniques) that
   provides connectivity.

   The use of Duplicate Address Detection opens up the possibility of
   denial of service attacks. Any node can respond to Neighbor
   Solicitations for a tentative address, causing the other node to
   reject the address as a duplicate. This attack is similar to other
   attacks involving the spoofing of Neighbor Discovery messages and can
   be addressed by requiring that Neighbor Discovery packets be
   authenticated [RFC1826].


7.  References


   [RFC1826] R. Atkinson.  "IP Authentication Header", RFC 1826, August   |
             1995.

   [IPv6-ETHER] M. Crawford. "A Method for the Transmission of IPv6
             Packets over Ethernet Networks", Internet Draft.

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

   [RFC1112] S. Deering, "Host Extensions for IP Multicasting", RFC
             1112, August, 1989.

   [ADDR-ARCH] Hinden, R., and S. Deering, "Internet Protocol Version     |
             (IPv6) Addressing Architecture", RFC 1884, December 1995.

   [DHCPv6] Internet Draft, Work in Progress.



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   [DISCOVERY] Narten, T., Nordmark, E., and W. Simpson, "Neighbor        |
             Discovery for IP Version 6 (IPv6)", RFC 1970, August 1996.   |


8.  Acknowledgements

   The authors would like to thank the members of both the IPNG and       |
   ADDRCONF working groups for their input. In particular, thanks to Jim  |
   Bound, Steve Deering, and Erik Nordmark. In addition, thanks goes to   |
   John Gilmore for alerting the WG of the "0 Lifetime Prefix             |
   Advertisement" denial of service attack vulnerability; this document   |
   incorporates changes that address this vulnerability.

   AUTHORS' ADDRESSES

   Susan Thomson                    Thomas Narten
   Bellcore                         IBM Corporation
   445 South Street                 P.O. Box 12195
   Morristown, NJ 07960             Research Triangle Park, NC 27709-2195
   USA                              USA

   phone: +1 201-829-4514           phone: +1 919 254 7798
   email: set@thumper.bellcore.com  email: narten@raleigh.ibm.com         |



9.  APPENDIX A: LOOPBACK SUPPRESSION & DUPLICATE ADDRESS DETECTION        |

   Determining whether a received multicast solicitation was looped back
   to the sender or actually came from another node is implementation-
   dependent.  A problematic case occurs when two interfaces attached to
   the same link happen to have the same identifier and link-layer        |
   address, and they both send out packets with identical contents at
   roughly the same time (e.g., Neighbor Solicitations for a tentative
   address as part of Duplicate Address Detection messages). Although a
   receiver will receive both packets, it cannot determine which packet
   was looped back and which packet came from the other node by simply
   comparing packet contents (i.e., the contents are identical). In this
   particular case, it is not necessary to know precisely which packet
   was looped back and which was sent by another node; if one receives
   more solicitations than were sent, the tentative address is a
   duplicate. However, the situation may not always be this
   straightforward.

   The IPv4 multicast specification [RFC1112] recommends that the
   service interface provide a way for an upper-layer protocol to
   inhibit local delivery of packets sent to a multicast group that the
   sending host is a member of. Some applications know that there will



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   be no other group members on the same host, and suppressing loopback
   prevents them from having to receive (and discard) the packets they
   themselves send out.  A straightforward way to implement this
   facility is to disable loopback at the hardware level (if supported
   by the hardware), with packets looped back (if requested) by
   software.  On interfaces in which the hardware itself suppresses
   loopbacks, a node running Duplicate Address Detection simply counts
   the number of Neighbor Solicitations received for a tentative address
   and compares them with the number expected. If there is a mismatch,
   the tentative address is a duplicate.

   In those cases where the hardware cannot suppress loopbacks, however,
   one possible software heuristic to filter out unwanted loopbacks is
   to discard any received packet whose link-layer source address is the
   same as the receiving interface's.  Unfortunately, use of that
   criteria also results in the discarding of all packets sent by
   another node using the same link-layer address. Duplicate Address
   Detection will fail on interfaces that filter received packets in
   this manner:

      o If a node performing Duplicate Address Detection discards
        received packets having the same source link-layer address as
        the receiving interface, it will also discard packets from other
        nodes also using the same link-layer address, including Neighbor
        Advertisement and Neighbor Solicitation messages required to
        make Duplicate Address Detection work correctly.  This
        particular problem can be avoided by temporarily disabling the
        software suppression of loopbacks while a node performs
        Duplicate Address Detection.

      o If a node that is already using a particular IP address discards
        received packets having the same link-layer source address as
        the interface, it will also discard Duplicate Address
        Detection-related Neighbor Solicitation messages sent by another
        node also using the same link-layer address.  Consequently,
        Duplicate Address Detection will fail, and the other node will
        configure a non-unique address. Since it is generally impossible
        to know when another node is performing Duplicate Address
        Detection, this scenario can be avoided only if software
        suppression of loopback is permanently disabled.

   Thus, to perform Duplicate Address Detection correctly in the case
   where two interfaces are using the same link-layer address, an
   implementation must have a good understanding of the interface's
   multicast loopback semantics, and the interface cannot discard
   received packets simply because the source link-layer address is the
   same as the interfaces.                                                |




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10.  APPENDIX B: CHANGES SINCE RFC 1971                                   |

   The following changes, which are also marked with change bars ('|' or  |
   '*') in the right margin, have been made since RFC 1970:               |

    o Changed document to use term "interface identifer" rather than      |
      "interface token" for consistency with other IPv6 documents.        |

    o Clarified definition of deprecated address to make clear it is OK   |
      to continue sending to or from deprecated addresses.                |

    o Reworded section 5.4 for clarity (no substantive change).           |

    o Added rules to Section 5.5.3 Router Advertisement processing to     |
      address potential denial-of-service attack when prefixes are        |
      advertised with very short Lifetimes.                               |

    o Clarified wording in Section 5.5.4 to make clear that all upper     |
      layer protocols must process (i.e., send and receive) packets sent  |
      to deprecated addresses.                                            |































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