First of all, I would like to thank some of the information provided by jzyhummel (blade [pins]) ^ _ ^
The concept of the NIC address is a bit confusing. Because there are two addresses, MAC addresses, and physical addresses, I usually say the network card address, I refer to the physical address, I don't know how others see? The physical address refers to the address of the ROM of the storage address on the NIC. The MAC address is this. The address used when the block card works, in general, the two addresses are the same, so many people are mixed, and even if they don't know when they are -_- # network cards, an Ethernet frame 60 to 1514 (not Including CRCs), the Crc of the frame is automatically added, and the preamble is automatically added. The NIC destination address and source address are driver added. So what address is used when the NIC work is used as a working address is determined by the driver :) Therefore, we can use it without changing the physical address of the NIC. The software method changes the work address of the specific NIC. The MAC address is typically saved in the registry, which can be modified, so there is a question: 1st, can be illegitized, IP, 2, can break some garbage encryption Software ... Many software is encrypted through the NIC address, there are two different. Some of the better than the physical address is encrypted. Some are encrypted by work addresses. The address obtained by working address encryption is a MAC address. This method can generally be cracked. It is a bit difficult to encrypt through physical address, but it is not no way.
