An Introduction to MAC Addressing.
MAC address (Media Access Control) is a unique value assigned to every piece of hardware that connects to the Network. MAC address is also known as hardware addresses or physical addresses. MAC address is composed of 12-digit hexadecimal numbers or 48 bits in length. The numbers are separated by colons as in the following example: 00:0E:2E:B9:A7:16. The first 6 digit of a MAC address contains the ID number of the adapter manufacturer. The second 6 digit contains the serial number assigned to the adapter by the manufacturer. As the bit can accept two values it is easy to count up that unique addresses can be 281 474 976 710 656. The IEEE expects the MAC-48 space to be exhausted no sooner than the year 2100. The technologies, which use the MAC-48: Ethernet, wireless networks, Bluetooth, token ring, FDDI, ATM, etc.
The Most Internet Service Provider (ISP) assign one fixed IP address to each customer. This fixed IP address assign to the customer’s MAC address. The ISP check IP address and MAC address, which customers is transferred. If result is correct a customer can connect to the Network. Whenever a customer replaces that device, however, or changes the network adapter inside it, the MAC address of this new equipment will no longer match the one registered at the ISP. The ISP will often disable the customer's Internet connection for security (and billing) reasons.
Windows XP allow to change the MAC address on some network cards, by system tools. A much easier and more reliable method to change a MAC address under Windows is to use this small utility.
Download ChangeMAC
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