The iron fact: the MAC address of the physical network card can never be modified

. About the MAC address, many people only stay on the surface, and do not have a deep understanding of the well-known, so when there are many ways to change the MAC address on the Internet, blindly Followed by, in fact, it is wrong, this article will tell you some knowledge about the Mac address, I hope to help you. 1. What is a Mac address? There are two types of addresses in the network card. One is the IP address that everyone is familiar with, and the other is the MAC address, which is the physical address of the network card. It is also called the hardware address or link address. This is the network card. The unique identity of itself. It has nothing to do with the network, no matter where the network card is connected to the network, the Mac address is unchanged. Its length is a 48-bit binary number consisting of 12 hexadecimal numbers of 00~0FFH, separated by "-" for each hexadecimal number, such as "00-10-5C-AD-72-E3" . However, many places on the network mention the way to modify the MAC address. Is it true? Let us first understand the true face of the Mac! First of all, the MAC address of the network card can never be changed! Never modify it! In this world On the top, there is no two NICs with the same Mac address! As for modifying the NIC's MAC, it is not really modifying its address, but modifying the MAC to be mapped to a value in the registry (in the registry, the MAC address of the NIC is saved) ), when the application or command uses the MAC address every time, in general, it does not directly read the MAC of the network card, but reads the value corresponding to the Mac in the registry. Therefore, to a certain extent, we can modify the value of the MAC address in the registry (but no matter how you change it, you can only modify the MAC address value of the registry, but you can never modify the MAC address of the network card), thus enabling : Deceive some attacks or programs to find the real Mac address of this machine! This is equivalent to the wolf is always a wolf, no matter what color of sheepskin, it is always a wolf! But the wolf in sheep's clothing can Do a lot of things that the wolf can't do! Well, just talk about how to modify the Mac address! Second, modify the Mac address simple method Right click on "My Network Places", execute "Properties", the following dialog box pops up! Above, click the “Configure” button, the following dialog box pops up! As shown above, select the “Advanced” tab, then find “NetWordAddress” in the “Properties” list, and the corresponding input box on the right side, enter it in the input box. It is not the same address as the Mac address of this machine! For example: enter "00-50 -8D-74-63-82";