OUI: Organizationally Unique Identifiers organizationally unique identifier IAB: Individual Address Block individual address block ETH: ETHERTYPE Ethertype eth-eg: 0x809B AppleTalk protocol 0x8137 IPX 0x86DD IPv6 0x0800 IPv4http: //standards.ieee.org/regauth/oui/forms /Http://standards.ieee.org/regauth/oui/pilot-ind.htmlhttp://standards.ieee.org/faqs/oui.html#q5http://standards.iee.org/regauth/oui/tutorials /Http://standards.ieee.org/regauth/OUI/index.shtml
http://standards.ieee.org/regauth/groupmac/tutorial.htmlStandard Group MAC Addresses A Tutorial Guide http://standards.ieee.org/announcements/pr_llcproupmac.htmlIEEE Registration Authority Provides a New Beginning for the Logical Link Control ( LLC) And Standard Group Media Access Control (Mac) Address Assignment Program
Http://www.julong.com.cn/service/zhishi2.asp Electrical and Electronic Engineer (IEEE) divides the data link layer into logical link control (abbreviations of LLC, Logical Link Control) and Media Access Control (Mac , Abbreviations of Media Access Control two sub-layers. The Medium Access Control (MAC) address consists of subset of data link layer addresses. The MAC address identifies the IEEE MAC address that executes the data link layer in the local area network is unique. The address length is 48 bits, which is represented by 12 hexadecimal numbers. IEEE defines 6 hexadecimal identifiers manufacturers or sellers, and therefore, the unique identifier is included (OUI); the latter 6 hexadecimal number or other useful information defined by the seller. The MAC address is sometimes referred to as a residual address (BIA) because they are felted in a read-only memory (ROM), which is copied to the random memory (RAM) when the interface card is preset. The same protocol cluster uses a different method to define the MAC address of the device. The commonly used methods have the following: (1) Map the network address into the MAC address address translation through the address conversion protocol is the process of mapping the network address to the MAC address. This process is done by using the Address Translation Protocol (ARP) in many protocol clusters. When the network address is associated with the MAC address, the network device stores information in the ARP buffer, so that the device can send data to the destination when there is no ARP transmission, because it already knows the MAC address of the destination. . The address conversion process is slightly different due to the different network environment. When the end system A is broadcast ARP demand on the LAN online for the MAC address of the system B, the single LAN start address translation. Although only end system B is transmitted by transmitting an ARP response end system A including a MAC address, all devices of the LAN receive the request. After the end system A receives the response, put the MAC address of the end system B has its ARP buffer (the ARP buffer is where the network address is associated with the MAC address), once the end system B is required, the end system A is immediately issued Data frames to end system B. However, when the source device and the destination device connects to different LANs via the router, the address conversion work is different. When the end system y provides for the MAC address of the end system z to broadcast the ARP request on the LAN, all devices on the LAN receive the agent router x of the system z is no exception. The proxy router X is retrieved by searching the routing table, and the end system z is subjected to the ARP request of the end system Y, and transmits an ARP answer containing the human router XMAC address, just like the router X is the end system z. After the end system Y receives the ARP response, the MAC address of the router X is stored in the end system z of the end system y buffer. When the end system z is communicated, the end system Y retrieves its ARP buffer, find The MAC address of the router X is directly issued. The router X receives the data from the end system Y, transfer it to the end system z on the different LAN network. (2) Learn more about other network reconciliation Macs through the Hello protocol The address Hello protocol is a network layer protocol that not only recognizes network devices, but also indicates their operational status. For example, when a new end system is joined, it will broadcast Hello messages online, and the network on the Internet will return one. Hello responds and transmitted by Hello messages in a particular interval indicates their operational status. Network devices can understand the MAC address of other devices by measuring the Hello protocol package. (3) The address is embedded in the network layer address or automatically generates the MAC address by the algorithm. There are three protocols to use a predictive MAC address, in which the MAC address is predict, because the network layer either embed the MAC address into the network layer address, or use the algorithm to generate a MAC address. These three protocol Xerox Network System (XNS), Novell Nette Packet Exchange (IPX) and Decnct Phase IV.
