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TCP/IP Guide by Charles M. Kozierok

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TCP/IP Address Resolution for IP Multicast Addresses

Like most discussions of address resolution, most of this chapter so far has focused on unicast communication, where a datagram is sent from one source device to one destination device. Whether direct mapping or dynamic resolution is used for resolving a network layer address, it is a relatively simple matter to resolve addresses when there is only one intended recipient of the datagram. As you've seen, TCP/IP uses ARP for its dynamic resolution scheme, which is designed for unicast resolution only.

However, IP also supports multicasting of datagrams, as I explain in the sections on IP multicasting and IP multicast addressing in Chapters Chapter 23 and Chapter 17, respectively. In this situation, ...

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