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TCP/IP Guide by Charles M. Kozierok

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IPv6 Multicast and Anycast Addressing

One of the most significant modifications in the general addressing model in IPv6 was a change to the basic types of addresses and how they were used. Unicast addresses are still the choice for the vast majority of communications as in IPv4, but the "bulk" addressing methods are different in IPv6. Broadcast as a specific addressing type has been eliminated. Instead, support for multicast addressing has been expanded and made a required part of the protocol, and a new type of addressing called anycast has been implemented.

IPv6 Multicast Addresses

Let's start by looking at multicast under IPv6. Multicasting is used to allow a single device to send a datagram to a group of recipients. IPv4 supported multicast ...

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