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|Impact of Traffic through the first NIC on the second NIC|
Why couldn't MAC addresses be used instead of IPv4|6 for networking?
Sometimes you want one host to have multiple IPs and don't want to add more ethernet cards. Mac addresses map directly to one unique (reasonably) piece of hardware, whereas one network interface may have N addresses. Just using the mac address would be a bad idea for this reason alone. Not only that the mac address is used fairly heavily in switching to determine where a frame goes. Disclosing a mac address can have bad consequences if someone on your network decides to ARP spoof.