Calculating the Interface ID Using EUI-64
EUI-64
Earlier in the chapter, Figure 3-5 showed the format of an IPv6 global unicast address with the second half of the address called the host ID or interface ID. The value of the interface ID portion of a global unicast address can be set to any value if no other host in the same subnet attempts to use the same value.
To automatically create a guaranteed-unique interface ID, IPv6 defines a method to calculate a 64-bit interface ID derived from that host’s MAC address. Because the burned-in MAC address should be literally globally unique, the derived interface ID should also be globally unique.
The EUI-64 ...
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