Lower layer

Ethernet protocol type: different from IPv4
IPv4: 0x0800
IPv6: 0x86dd

Hardware address resolution
IPv4: medium dependent, ARP for ethernet
Simple protocol
Uses link-layer broadcast (noisy)
IPv6: medium independent, NDP on ICMPv6
Manages more state than ARP, more complex
Implements DAD, Duplicated Address Detection
Uses link-layer multicast (more friendly to other nodes on link)

Multicast address mappings
Take lowermost 4 bytes from IPv6 address, and embed to MAC addr
33:33:xx:yy:zz:uu