IP ADDRESS ( IPv6 )
IPv6 Address Types
IPv6 does not use classes. IPv6 supports the following three IP address types:
- unicast
- multicast
- anycast
Unicast and multicast messaging in IPv6 are conceptually
the same as in IPv4. IPv6 does not support broadcast, but its multicast
mechanism accomplishes essentially the same effect. Multicast addresses
in IPv6 start with 'FF' (255) just like IPv4 addresses.
Anycast in IPv6 is a variation on multicast. Whereas
multicast delivers messages to all nodes in the multicast group, anycast
delivers messages to any one node in the multicast group. Anycast is an
advanced networking concept designed to support the failover and load
balancing needs of applications.
IPv6 Reserved Addresses
IPv6 reserves just two special
addresses: 0:0:0:0:0:0:0:0 and 0:0:0:0:0:0:0:1. IPv6 uses
0:0:0:0:0:0:0:0 internal to the protocol implementation, so nodes cannot
use it for their own communication purposes. IPv6 uses 0:0:0:0:0:0:0:1
as its loopback address, equivalent to 127.0.0.1 in IPv4.
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