If answer to 1 is no, then is EUI-64 just logical and always produced from 48 bit MAC address? Do manufacturers also assign EUI-64 addresses nowadays? (I have this doubt because I never came across 64 bit physical address when I run ipconfig -all on PC. MAC addresses are assigned by manufacturers. The additionalġ6 bits are defined as 15 ones followed by one zero, or FFFE16. We need to change the local/global bit to 1 and insert an additional 16 bits. To map a 64-bit physical address, the global/local bit of this format needs to be changedįrom 0 to 1 (local to global) to define an interface address, as shown in figure below: Two common linklayer addressing schemes can be considered for this purpose: the 64-bit extended unique identifier (EUI-64) defined by IEEE and the 48-bit link-layer address defined by Ethernet. A link-layer address whose length is less than 64 bits can be embedded as the whole or part of the interface identifier, eliminating the mapping process. The IPv6 addressing allows this relationship. In IPv4 addressing, there is not a specific relation between the hostid (at the IP level) and link-layer address (at the data-link layer) because the link-layer address is normally much longer than the hostid.
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