Furthermore ff:fe is inserted and fe80:: prepended. IPv6 Link local address: fe80::xyxx:xxff:fexx:xxxx. The IPv6 Link-local address is derived form the MAC- or Ethernet hardware address in the following way Mac address: XX:XX:XX:XX:XX:XX. So, the interface ID is now 02BB:CCFF:FEDD:1122.Īnother example, this time with the MAC address of 00000C432A35.ġ. Convert MAC address to Link-local address or Link-local address to MAC address. Next we need to insert FFFE in the middle of the address listed above: hex 02BBCC FFFEDD1122 Now we have this address in hex: hex 02BBCCDD1122 Well, first we need to flip the seventh bit from 0 to 1. When this is done, the interface ID is commonly called the modified extended unique identifier 64 (EUI-64).įor example, if the MAC address of a nework card is 00:BB:CC:DD:11:22 the interface ID would be 02BBCCFFFEDD1122. Also, the 7th Bit in the first byte is flipped to a binary 1 (if the 7th bit is set to 0 it means that the MAC address is a burned-in MAC address). A 64-bit interface ID is created by inserting the hex value of FFFE in the middle of the MAC address of the network card. RFC 4193 introduces a globally unique IPv6 unicast address format intended for local communications, usually inside of a site. The second part of an IPv6 unicast or anycast address is typically a 64-bit interface identifier used to identify a host’s network interface.
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