MicroNugget: What is a Solicited Nodes Multicast Group in IPv6?

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In this video, Keith Barker covers solicited node multicast groups, what they are, how they're created and how they can be used in a network. IPv6 and IPv4 networks act differently, and solicited node multicast groups sit at the heart of IPv6's improved speed and efficiency.

A device on a network doesn't know, by default, the Layer 2 address of its gateway. In IPv4, an ARP request would get broadcast, and the device could glean the Layer 2 address from the response that came back. But in IPv6, there's no ARP, and there's no Layer 2 broadcast.

But IPv6 does have solicited node multicast groups, so a device can send a request to that group, and if the router is configured properly and listening, it'll respond with the Layer 2 address. Learn what it takes for a device on an IPv6 network to join these special multicast groups and other ways that using them can improve your network performance.

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