Ubuntu: Whose is the IP address showed after command `ip -6 neigh`?



Question:

xxx@xxx:~$ ip -6 neigh  fe80::fe48:efff:fe30:c7b dev eth0 lladdr fc:48:ef:30:0c:7b router REACHABLE  

Whose IP is fe80::fe48:efff:fe30:c7b?
And whose MAC is fc:48:ef:30:0c:7b?
What does lladdr mean?
What would change if I configure it to permanent?


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