Chapter 2 IPv6 Address Configuration
support to the extension header and options, which not only allows more efficient
forwarding, but also provides sufficient support for future loading of new applications
to networks. Each IPv6 packet can have 0, 1 or more extension headers. Each
extension header is determined by the "next header" domain of the previous header.
2.1.1 Address Classification
Request For Comments (
) contains a "map" of IPv6 address space, which describes
how the address space is allocated, the different types of address allocation, the prefixes
(the starting few bits in address allocation) and the length of address allocation, which is
a part of the whole address space.
shows allocation of IPv6 address space.
Table 2-1 IPv6 Address Space
Allocation
Prefix
Fraction of Address Space
Reserved
0000 0000
1/256
Unallocated
0000 0001
1/256
Reserved for NSAP allocation
0000 001
1/128
Reserved for IPX allocation
0000 010
1/128
Unallocated
0000 011
1/128
Unallocated
0000 1
1/32
Unallocated
0001
1/32
Aggregatable global unicast
address
001 [2,3]
1/8
Unallocated
010
1/8
Unallocated
011
1/8
Unallocated
100
1/8
Unallocated
101
1/8
Unallocated
110
1/8
Unallocated
1110
1/16
Unallocated
1111 0
1/32
Unallocated
1111 10
1/64
Unallocated
1111 110
1/128
Unallocated
1111 1110 0
1/512
Link local unicast address
1111 1110 10 [FE8]
1/1024
2-3
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