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 network 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. 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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