Mac address associated
We networking, Internet, packet recognize only the MAC address of the ARP cache table, instead of to the card and going to find MAC, that is, ARP ARP submit the MAC address to route only MAC address ARP cache table, It can be said that MAC address is not real, but virtual.
MAC address is unique, but after all, the card is a hardware, software needs to support that operating system to identify, while the operating system recognized the MAC address can be changed, it is nothing but a string
If the MAC address is a stand-alone, then no problem. If the network, it would a problem. If the baseline over a LAN connection, then, IP and MAC can be changed to the same. Such account may share one IP Internet (network setting to be reasonable), but inside the LAN between the two hosts are no longer mutually accessed. If the same MAC address appears on different subnets, as long as they do not packets over the same data link layer (requires a computer network expertise can understand) will not be a problem.
Modify its own MAC address in two ways:
- Hardware modifications : the hardware approach is to operate directly on the card, to modify the MAC address stored in the EPROM inside the card, to modify the program provided by the card manufacturer can change the address in the memory.
- Modify the software : Windows in, MAC card stored in the registry, the actual use is extracted from the registry, so long as you can modify the registry to change the MAC, when modifying the local connection properties and modification in DOS, Registry it will automatically be corresponding changes, modifications, and is equivalent to the registry.