In the IPv4 world, when you want to talk to another computer, you ask which MAC address claims a given IPv4 address, the arp who-has ... tell ...
exchange as per tcpdump
, and a cache of such mappings from IPv4 to MAC addresses is usually available through arp -an
.
What about IPv6 with manual configuration? IPv6 addresses don't show up on arp -an
.
How does one computer discover another one over IPv6 within the same prefix?