independent of the scope value.  For example, if the "NTP servers
   group" is assigned a permanent multicast address with a group ID of
   43 (hex), then:

        FF01:0:0:0:0:0:0:43 means all NTP servers on the same node as
        the sender.

        FF02:0:0:0:0:0:0:43 means all NTP servers on the same link as
        the sender.

        FF05:0:0:0:0:0:0:43 means all NTP servers at the same site as
        the sender.

        FF0E:0:0:0:0:0:0:43 means all NTP servers in the internet.

   Non-permanently-assigned multicast addresses are meaningful only
   within a given scope.  For example, a group identified by the non-
   permanent, site-local multicast address FF15:0:0:0:0:0:0:43 at one
   site bears no relationship to a group using the same address at a
   different site, nor to a non-permanent group using the same group ID
   with different scope, nor to a permanent group with the same group
   ID.

   Multicast addresses must not be used as source addresses in IPv6
   datagrams or appear in any routing header.


   2.6.1 Pre-Defined Multicast Addresses

   The following well-known multicast addresses are pre-defined:

        Reserved Multicast Addresses:   FF00:0:0:0:0:0:0:0
                                        FF01:0:0:0:0:0:0:0
                                        FF02:0:0:0:0:0:0:0
                                        FF03:0:0:0:0:0:0:0
                                        FF04:0:0:0:0:0:0:0
                                        FF05:0:0:0:0:0:0:0
                                        FF06:0:0:0:0:0:0:0




 
RFC 1884              IPv6 Addressing Architecture         December 1995


                                        FF07:0:0:0:0:0:0:0
                                        FF08:0:0:0:0:0:0:0
                                        FF09:0:0:0:0:0:0:0
                                        FF0A:0:0:0:0:0:0:0
                                        FF0B:0:0:0:0:0:0:0
                                        FF0C:0:0:0:0:0:0:0
                                        FF0D:0:0:0:0:0:0:0
                                        FF0E:0:0:0:0:0:0:0
                                        FF0F:0:0:0:0:0:0:0

   The above multicast addresses are reserved and shall never be
   assigned to any multicast group.

        All Nodes Addresses:    FF01:0:0:0:0:0:0:1
                                FF02:0:0:0:0:0:0:1

   The above multicast addresses identify the group of all IPv6 nodes,
   within scope 1 (node-local) or 2 (link-local).

        All Routers Addresses:   FF01:0:0:0:0:0:0:2
                                 FF02:0:0:0:0:0:0:2

   The above multicast addresses identify the group of all IPv6 routers,
   within scope 1 (node-local) or 2 (link-local).

        DHCP Server/Relay-Agent: FF02:0:0:0:0:0:0:C

   The above multicast addresses identify the group of all IPv6 DHCP
   Servers and Relay Agents within scope 2 (link-local).

        Solicited-Node Address:  FF02:0:0:0:0:1:XXXX:XXXX

   The above multicast address is computed as a function of a node's
   unicast and anycast addresses.  The solicited-node multicast address
   is formed by taking the low-order 32 bits of the address (unicast or
   anycast) and appending those bits to the 96-bit prefix FF02:0:0:0:0:1
   resulting in a multicast address in the range

           FF02:0:0:0:0:1:0000:0000

   to

           FF02:0:0:0:0:1:FFFF:FFFF

   For example, the solicited node multicast address corresponding to
   the IPv6 address 4037::01:800:200E:8C6C is FF02::1:200E:8C6C.  IPv6
   addresses that differ only in the high-order bits, e.g., due to
   multiple high-order prefixes associated with different providers,




 
RFC 1884              IPv6 Addressing Architecture         December 1995