I have heared about configuring an NIC on a computer with a two ip addresses using something called "ip alias" or alike, i don't understand how it can be set while we have only one MAC address.. and how we can do it?
I dont know how to set it either on a pc, as I'm not very good in workstations configuration.
But, there's no problem having more than 1 IP using the same MAC.
If someone needs to communicate with your machine, it will send the packet to your IP, and the last hop router will ARP for this IP, your machine will respond with it's only MAC for every IP it has.
So you're gateway will have an 2 ARP entries:
No problem here, you can still be unique, even with 1 mac.
Actually when you have a Multi-layer switch, you'll see the IPs you have configured on the interface vlan (SVI) all associated with a single MAC (unless you configure a MAC in each interface vlan of course)
check this "live example" for instance:
switch-layer3>sh arp | i 0101.207a.1a7f
Internet 10.12.221.195 - 0101.207a.1a7f ARPA Vlan606
Internet 10.12.192.145 - 0101.207a.1a7f ARPA GigabitEthernet1/1
Internet 10.12.163.195 - 0101.207a.1a7f ARPA Vlan706
Internet 10.12.166.3 - 0101.207a.1a7f ARPA Vlan166
Internet 10.12.164.3 - 0101.207a.1a7f ARPA Vlan164
Internet 10.12.165.3 - 0101.207a.1a7f ARPA Vlan165
Internet 10.12.170.3 - 0101.207a.1a7f ARPA Vlan170
Internet 10.12.171.3 - 0101.207a.1a7f ARPA Vlan171
Internet 10.12.168.3 - 0101.207a.1a7f ARPA Vlan168
Internet 10.12.169.3 - 0101.207a.1a7f ARPA Vlan169
Internet 10.12.174.3 - 0101.207a.1a7f ARPA Vlan174
Internet 10.12.172.3 - 0101.207a.1a7f ARPA Vlan172
Internet 10.12.173.3 - 0101.207a.1a7f ARPA Vlan173
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