Now everyone is ADSL Internet, when you check the network time will find that each Internet telecom will record your network card MAC address, this is because the IP address is dynamic (each time the Internet is different), and the MAC address is unchanged--each net card has a unique Mac (physical) address, Therefore the MAC address becomes the customer's online ID card, through the record MAC address, can confirm is you on the net!
Use of MAC addresses
The MAC address is fixed in the NIC, and the MAC address of each net card is different. Network card in the production process, the manufacturer will be in its eprom burning a group of numbers, this group of numbers, each net card is different, this is the Mac (physical) address of the network card.
Because of the uniqueness of the MAC address, it is primarily used to identify users on the network. For example, ADSL Internet, telecommunications use it to charge, confirm that you are on the network, in the Campus network, MAC address can also be used to identify users. For the official users of the campus network, their MAC address will be registered on the server side, if you are an illegal user, the server does not have your network card MAC address, so when you try to connect to the Internet, the server will immediately recognize you, prevent you connect to the network. (Computer science)
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