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So I am trying a little autoconfiguration on some virtual machines while observing what happens in wireshark and trying to understand what how it works, step by step.

This is how any of those captures looks. I can see the router solicitation and advertisement, as well as the DAD packages. However, there is always a bunch of Multicast Listener Report Messages, and I have not been able to figure out their purpose.

This are how this packets look.

I have tried googling around but I have not found any answers. Any ideas?

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RFC 4862:

5.4.2. Sending Neighbor Solicitation Messages

Before sending a Neighbor Solicitation, an interface MUST join the all-nodes multicast address and the solicited-node multicast address
of the tentative address.

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