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Organizations issuing EUI-64s are cautioned against issuing identifiers that could be confused with these forms. The IEEE has a target lifetime of 100 years for applications using MAC-48 space, but encourages adoption of EUI-64s instead. IPv6 — one of the most prominent standards that uses a Modified EUI-64 — treats MAC-48 as EUI-48 instead (as it is chosen from the same address pool) and toggles the U/L bit (as this makes it easier to type locally assigned IPv6 addresses based on the Modified EUI-64). This results in extending MAC addresses (such as IEEE 802 MAC address) to Modified EUI-64 using only FF-FE (and never FF-FF) and with the U/L bit inverted. Based on this, I have following questions: • What is the practical difference between MAC-48 and EUI-48?

From a MAC address (48 bits) to a IPv6 address (128 bits): • take the mac address: 52:74:f2:b1:a8:7f • throw ff:fe in the middle: 52:74:f2:ff:fe:b1:a8:7f • reformat to IPv6 notation 5274:f2ff:feb1:a87f • convert the first octet from hexadecimal to binary: 52 -> 01010010 • invert the bit at index 6 (counting from 0): 01010010 -> 01010000 • convert octet back to hexadecimal: 01010000 -> 50 • replace first octet with newly calculated one: 5074:f2ff:feb1:a87f • prepend the link-local prefix: fe80::5074:f2ff:feb1:a87f.

In other words, any EUI-64 address having 0xFFFE immediately following its OUI portion can be recognized as having been generated from an EUI-48 (or MAC) address. The second step is to invert the universal/local (U/L) flag (bit 7) in the OUI portion of the address. Join Stack Overflow to learn, share knowledge, and build your career.

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As, The distinction between EUI-48 and MAC-48 identifiers is purely nominal: MAC-48 is used for network hardware; EUI-48 is used to identify other devices and software. (Thus, by definition, an EUI-48 is not in fact a 'MAC address', although it is syntactically indistinguishable from one and assigned from the same numbering space.) The IEEE now considers the label MAC-48 to be an obsolete term, previously used to refer to a specific type of EUI-48 identifier used to address hardware interfaces within existing 802-based networking applications, and thus not to be used in the future.

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The first step is to convert the 48-bit MAC address to a 64-bit value. To do this, we break the MAC address into its two 24-bit halves: the and the NIC specific part.

Also, what is the significance of Global Unicast Address (2001:DB8::212:7FFF:FEEB:6B40) and why it is different from link local address? Which one is the interface IP for f0/0? Please reply. Thanks in advance! @Syed Your answer lies here: Router(config-if)# ipv6 address 2001:db8::/64 eui-64 This command sets the address of the interface to 2001:db8::/64, the parameter 'eui-64' at the end of this command tells the router to generate the last 64 bits using EUI-64.

Instead, the proprietary term EUI-48 should be used for this purpose. In addition, the EUI-64 numbering system encompasses both MAC-48 and EUI-48 identifiers by a simple translation mechanism. To convert a MAC-48 into an EUI-64, copy the OUI, append the two octets FF-FF and then copy the organization-specified extension identifier. To convert an EUI-48 into an EUI-64, the same process is used, but the sequence inserted is FF-FE. In both cases, the process can be trivially reversed when necessary.

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Since people who wish to manually set an IPV6 address would likely use many zero’s, something like FE80::24 (FE80:0000:0000:0000:0000:0000:0000:0020), the conversion was designed that such manual address would indicate that it was generated from a locally administered mac address rather than a real MAC. Hello, isn’t the “7nth bit” fliped instead of the “6th bit” while converting a mac address into IP version 6? The person who wrote this guide says to flip the 1 that makes “52” into a “0”. I think they are wrong and if not please correct me by telling me why is it the 6th bit? The 7nth bit is fliped.