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Request support Semantically Opaque Interface Identifiers with IPv6 (SLAAC) RFC 7217 #4625
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RFC 4862 defines how to create an GUA (Global Unique Address) via SLAAC. But a GUA based on MAC address (EUI64) has limitations as referenced in RFC 7707, and a new unguessable method has been created via RFC 7217. iOS 10, and Mac OSX 10.12 support RFC 7217.