How does LLMNR differ from IPv6 ICMP Node Information Query?
IPv6 ICMP Node Information query is a specification available here. The biggest difference between this and LLMNR is that Node Information Queries are only used with IPv6, whereas LLMNR can be used either with IPv4 or IPv6. Another difference is that LLMNR queries are only sent to a single multicast address, whereas IPv6 ICMP Node Information queries are sent to multiple multicast addresses, based on a hashing algorithm. This makes LLMNR somewhat simpler to implement (and more likely to interoperate).