Hm, so because I am so eager to understand things I know have the task to explain #NeighborDiscoveryProtocol of #IPv6 tomorrow.
From what I understand, I can think of multicast of like topics in MQTT:
One sender and whoever is interested can read from it. New hosts are subscribed to it when they go online.
By setting certain flags in #ICMPv6 their are messages for routers and neighbors. One for request and a matching respond (called solicitation and advertisement).
Now I would love to have a #SysAdmin confirm my understanding.
