![]() Here’s how I fixed the problem. I did this on a CentOS 6 server, but it looks like the procedure is the same for CentOS 7. CentOS stores this value in two of its files, and when it changes (which is hardly ever the case), those files need to be updated. Although my data was save, the server wouldn’t connect to the network anymore – because it had a new MAC address. Lucky for me, the data centre could simply swap out my hard disks and put them into another server. This means that 2 24 (= 16.777.216) unique OUAs can be assigned per OUI.I had an issue with one of my servers the other day: its power supply died unexpectedly during a scheduled restart. Bit 25-48 (network adapter identifier): Bits 25 to 48 provide device manufacturers with 24 bits for assigning a unique hardware identifier (organizationally unique address, OUA).A corresponding service is available, for example, on. The assignment of OUIs is usually public and can be determined via databases. Bit 3–24 (manufacturer identification): Bits 3 to 24 encode an identifier (organizationally unique identifier, OUI), which is assigned exclusively to hardware manufacturers by IEEE.Addresses that are only locally unique are called locally administered address (LAA) and are marked with U/L = 1. If U/L = 0, the address is valid worldwide as a universally administered address (UAA). Bit 2 (registry): The second bit of the MAC address indicates whether it is an address with global validity (universal) or whether the address has been assigned locally (local). ![]() Multicast addresses are identified by I/G = 1 and are addressed to several receivers. ![]() If I/G = 0, it is a unicast address for a single network adapter. ![]() This bit is called I/G (short for individual/group). Bit 1 (receiver): The first bit of the MAC address specifies whether it is an individual or group address.The bit sequence of each MAC address is divided into 4 areas, each of which encodes different information. ![]()
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