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TCP/IP Configuration Multicast & Anycast Addresses Now let's review IPv6 Multicast addresses, which are actually similar to IPv4 Multi-cast, they are one-to-many IP addresses. For this discussion we diagram the proposed IPv6 environment to demonstrate how these works with a 128 bit IP address system. Say for instance you want to send a message to a specific group. You'll learn how to identify multicast IP addresses, you'll learn what happened to the 255.255…numbering convention and what an "all host group" is. With Anycast, you get the best of both worlds, it can be one-to-one or one-to-many. The purpose of the Anycast IP address in IPv6 is to connect to the closest or nearest IP address, so we'll discuss how that works and why that configuration is necessary.