Auto-configuration of link-local

MAC address (e.g Ethernet)
IEEE 802 address (6 bytes)
00:60:97:40:ef:ab

Converting MAC address to interface ID
260:97ff:fe40:efab
00:60:97 + ff:fe + 40:ef:ab
Negate one bit

Generating a link-local address
fe80::260:97ff:fe40:efab

Now IPv6 nodes can communicate within the link!