EUI-64 IPv6: Why flip 7th bit of 1st byte - Cisco
IPv6 nodes are not required to validate that interface identifiers created with modified EUI-64 tokens with the 'u' bit set to universal are unique. The use of the universal/local bit in the Modified EUI-64 format identifier is to allow development of future technology that can take advantage of interface identifiers with universal scope. 6.
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