This 48-bit address space contains potentially 2 48 (over 281 trillion) possible MAC addresses. The IEEE 802 MAC address originally comes from the Xerox Network Systems Ethernet addressing scheme. The b0 bit distinguishes multicast and unicast addressing and the b1 bit distinguishes universal and locally administered addressing. However, two network interfaces connected to two different networks can share the same MAC address.Īddress details The structure of a 48-bit MAC address. Network nodes with multiple network interfaces, such as routers and multilayer switches, must have a unique MAC address for each network interface in the same network. MAC addresses are formed according to the principles of two numbering spaces based on extended unique identifiers (EUIs) managed by the Institute of Electrical and Electronics Engineers (IEEE): EUI-48-which replaces the obsolete term MAC-48-and EUI-64. The address typically includes a manufacturer's organizationally unique identifier (OUI). Many network interfaces, however, support changing their MAC addresses. Each address can be stored in the interface hardware, such as its read-only memory, or by a firmware mechanism. MAC addresses are primarily assigned by device manufacturers, and are therefore often referred to as the burned-in address, or as an Ethernet hardware address, hardware address, or physical address. As typically represented, MAC addresses are recognizable as six groups of two hexadecimal digits, separated by hyphens, colons, or without a separator. Within the Open Systems Interconnection (OSI) network model, MAC addresses are used in the medium access control protocol sublayer of the data link layer. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth. Label of a UMTS router with MAC addresses for LAN and WLAN modulesĪ MAC address (short for medium access control address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. Can’t rely on the windows randomly generated IPV6 address.Not to be confused with Mac Address (YouTube channel). Therefore if I want to parse the WDS log files to identify each PC in the logs I need to construct the IPv 6 address using the EUI-64 method. This site explains, the Windows does not use the Mac address to generate the IPv6 LinkLocalAddress IPv6: How Windows generates Link-Local Addresses (EUI-64) – SID-500.COM. We are talking about the same Ethernet device. The windows IPv6LinkLocalAddress value for that device is fe80::6d8d:28d8:191b:3f30%3 in this example the WDS server show a log entry such as : The WDS Bitlocker network unlock logs show the IPv6 Link local address of the physical device when the client PC is booting, and it the PC’s UEFI bios that send’s out the Network unlock request. I agree simple is better but in this case it does not work, The WDS logs are obtained in this manner $WDSEventsVerbose = Get-WinEvent -cn $WDS -EA silentlycontinue -FilterHashtable = (Get-Netadapter -CimSession $Script:RemoteCimSession | Where-Object įor remote systems just use PSRemoting as normal. I am parsing WDS network unlock logs and want to identify source computer. I got starting by getting the Mac I am interested in. Note the that IPV6 address obtained by the ipconfig / Get-NetIPAddress are not suitable for my needs, these address obfuscate the Mac address.
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