Until more experience has been gained and solutions have been agreed
upon for those problems, the following restrictions are imposed on IPv6 anycast
addresses: (1) An anycast address must not be used as the source address of an IPv6
packet. (2) An anycast address must not be assigned to an IPv6 host; that is, it may be
assigned to an IPv6 router only.
Transitioning to IPv6 275
Global Addresses
The IPv6 global unicast address is the equivalent of the IPv4 global unicast address. A
global unicast address is an IPv6 address from the global unicast pre?¬?x. The structure of
global unicast addresses enables the aggregation of routing pre?¬?xes, which limits the
number of routing table entries in the global routing table. Global unicast addresses that are
used on links are aggregated upward through organizations and eventually to the ISPs.
Reserved Addresses
The IETF reserves a portion of the IPv6 address space for various uses, both present and
future. Reserved addresses represent 1/256th of the total IPv6 address space. Some of the
other types of IPv6 addresses come from this block.
Private Addresses
A block of IPv6 addresses is set aside for private addresses, just as is done in IPv4.
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