I have two questions that both assume an attacker who has my MAC address:
Suppose an attacker connects to the Internet before me, spoofing my MAC. I then connect and tell people to connect to my EUI-64 address. Will the attacker get my packets? Will the attacker be able to do illegal stuff pretending to be me?
Suppose I connect first and then the attacker connects, spoofing my MAC. I am communicating with people using my EUI-64 address. Will the attacker be able to get my packets, if he gets himself assigned my EUI-64 address? Will the attacker be able to do illegal stuff pretending to be me?
I guess what I'm asking, is, EUI-64 depends on MAC addresses being unique. But since it's possible to spoof MACs, how can IPv6 address have any sort of uniqueness assumption at all? And if addresses aren't unique, how can routing possibly work?