RFC 4291:IP Version 6 Addressing Architecture
RFC-Ref

Single Interface


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... Unicast: An identifier for a single interface. A packet sent to a unicast address is delivered to the interface ...
... An IPv6 unicast address refers to a single interface. Since each interface belongs to a single node ...
... unicast address (see Section 2.8 for additional required addresses). A single interface may also have multiple IPv6 addresses of any type (unicast ...
... Interface-Local scope spans only a single interface on a node and is useful only for loopback ...



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