Chapter2IPv6BasicConguration
1ormoreextensionheaders.Eachextensionheaderisdeter-
minedbythe“nextheader”domainofthepreviousheader .
AddressClassification
RFC2373containsa“map”ofIPv6addressspace,whichdescribes
howtheaddressspaceisallocated,thedifferenttypesofaddress
allocation,theprexes(thestartingfewbitsinaddressallocation)
andthelengthofaddressallocation,whichisapartofthewhole
addressspace.T able3showsallocationofIPv6addressspace.
TABLE3IPV6ADDRESSSPACE
Allocation
PrexFractionofAddress
Space
Reserved
00000000
1/256
Unallocated
00000001
1/256
ReservedforNSAP
allocation
0000001
1/128
ReservedforIPX
allocation
0000010
1/128
Unallocated
0000011
1/128
Unallocated
00001
1/32
Unallocated
0001
1/32
aggregatableglobal
unicastaddress
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
11110
1/32
Unallocated
111110
1/64
Unallocated
1111110
1/128
CondentialandProprietaryInformationofZTECORPORATION5