NOTE An address parser identi?¬?es the number of missing zeros by separating the
two parts and entering 0 until the 128 bits are complete. If two :: notations are placed in
the address, there is no way to identify the size of each block of zeros.
274 Chapter 7: Managing Address Spaces with NAT and IPv6
Broadcasting in IPv4 results in a number of problems. Broadcasting generates a number of
interrupts in every computer on the network and, in some cases, triggers malfunctions that
can completely halt an entire network. This disastrous network event is known as a
broadcast storm.
In IPv6, broadcasting does not exist. IPv6 replaces broadcasts with multicasts and anycasts.
Multicast enables ef?¬?cient network operation by using a number of functionally speci?¬?c
multicast groups to send requests to a limited number of computers on the network. The
multicast groups prevent most of the problems that are related to broadcast storms in IPv4.
The range of multicast addresses in IPv6 is larger than in IPv4. For the near future,
allocation of multicast groups is not being limited.
IPv6 also de?¬?nes a new type of address called an anycast address. An anycast address
identi?¬?es a list of devices or nodes; therefore, an anycast address identi?¬?es multiple
interfaces.
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