In this tutorial, I will cover what we mean by MAC address, what it's used for, and how to change it.
Now imagine you have 100s of servers, so connecting to each one and getting the MAC can be nasty so we can just change the MAC address of these servers as per our need and then just use them to perform PXE boot.ĪLSO READ: Install Airmon-ng Kali Linux Now this should not be a problem when we are using DHCP but if you want to use static IP then you must define the MAC Address of the interface and the IP to be assigned.
For PXE boot we perform network based installation. 
So we decided to update the PCI ID of each interface using udev rule bundled inside initrd to overcome this issue.
We had a very old rack server where we failed to installed RHEL 8 and the MAC address of the interfaces from this server kept changing after every reboot. Now you may wonder when the MAC Address is already assigned to an interface then why would we want to change it? Well there can be a number of scenarios, speaking from my personal experience MAC Address is a physical identity assigned to each interface. It is similar that IP at layer 3 works well if it has the support of layer 2 (Ethernet and mac addresses) but without the support of layer 2 it does not work.When it comes to networking, you've probably heard of the term MAC addressed a lot. But the engine without the media does not go well. The engine runs well and if we connect it with a propeller and put it in a boat it goes well or if we put it with wheels in a car and it goes well. Perhaps suggesting that devices could communicate using just IP but not mac addresses is similar to having a good engine in a car and expecting it to work if we remove the wheels. In current environments where it is more common that all interfaces are Ethernet it may be a bit more difficult to understand the distinction. In older environments where a router was likely to have both Ethernet and Serial ports it may be easier to understand the advantage that IP did not need to worry about whether it was going over Ethernet or HDLC. IP does not have to worry about how to make local communication which is layer 2. The way that IP was designed depends on having layer 2 working and providing local communication. 
The real answer to that question is that our network protocols are based on the layered network model in which IP is layer 3 and runs on layer 2. What the original poster is suggesting is that the device just use IP and not bother with mac addresses. I do not understand the response from Leo saying that it can be done if device is assigned a static IP.
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