For example, the solicited node multicast address corresponding to
   the IPv6 address 4037::01:800:200E:8C6C is FF02::1:FF0E:8C6C.  IPv6
   addresses that differ only in the high-order bits, e.g., due to
   multiple high-order prefixes associated with different aggregations,
   will map to the same solicited-node address thereby, reducing the
   number of multicast addresses a node must join.

   A node is required to compute and join (on the appropriate interface)
   the associated Solicited-Node multicast addresses for every unicast
   and anycast address it is assigned.

2.8 A Node's Required Addresses

   A host is required to recognize the following addresses as
   identifying itself:

      o  Its required Link-Local Address for each interface.
      o  Any additional Unicast and Anycast Addresses that have been
         configured for the node's interfaces (manually or
         automatically).
      o  The loopback address.
      o  The All-Nodes Multicast Addresses defined in section 2.7.1.
      o  The Solicited-Node Multicast Address for each of its unicast
         and anycast addresses.
      o  Multicast Addresses of all other groups to which the node
         belongs.

   A router is required to recognize all addresses that a host is
   required to recognize, plus the following addresses as identifying
   itself:

      o  The Subnet-Router Anycast Addresses for all interfaces for
         which it is configured to act as a router.
      o  All other Anycast Addresses with which the router has been
         configured.
      o  The All-Routers Multicast Addresses defined in section 2.7.1.

3. Security Considerations

   IPv6 addressing documents do not have any direct impact on Internet
   infrastructure security.  Authentication of IPv6 packets is defined
   in [AUTH].










 
RFC 3513              IPv6 Addressing Architecture            April 2003


4. IANA Considerations

   The table and notes at http://www.isi.edu/in-
   notes/iana/assignments/ipv6-address-space.txt should be replaced with
   the following:

   INTERNET PROTOCOL VERSION 6 ADDRESS SPACE

   The initial assignment of IPv6 address space is as follows:

   Allocation                            Prefix         Fraction of
                                         (binary)       Address Space
   -----------------------------------   --------       -------------
   Unassigned (see Note 1 below)         0000 0000      1/256
   Unassigned                            0000 0001      1/256
   Reserved for NSAP Allocation          0000 001       1/128 [RFC1888]
   Unassigned                            0000 01        1/64
   Unassigned                            0000 1         1/32
   Unassigned                            0001           1/16
   Global Unicast                        001            1/8   [RFC2374]
   Unassigned                            010            1/8
   Unassigned                            011            1/8
   Unassigned                            100            1/8
   Unassigned                            101            1/8
   Unassigned                            110            1/8
   Unassigned                            1110           1/16
   Unassigned                            1111 0         1/32
   Unassigned                            1111 10        1/64
   Unassigned                            1111 110       1/128
   Unassigned                            1111 1110 0    1/512
   Link-Local Unicast Addresses          1111 1110 10   1/1024
   Site-Local Unicast Addresses          1111 1110 11   1/1024
   Multicast Addresses                   1111 1111      1/256

   Notes:

   1. The "unspecified address", the "loopback address", and the IPv6
      Addresses with Embedded IPv4 Addresses are assigned out of the
      0000 0000 binary prefix space.

   2. For now, IANA should limit its allocation of IPv6 unicast address
      space to the range of addresses that start with binary value 001.