RFC 4291:IP Version 6 Addressing Architecture
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destination


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... link-scope are not needed for interfaces that are not used as the origin or destination of any IPv6 packets to or from non-neighbors ...
... The unspecified address must not be used as the destination address of IPv6 packets or in IPv6 Routing ...
... node. An IPv6 packet with a destination address of loopback must never be sent outside of a single node ...
... router. A packet received on an interface with a destination address of loopback must be dropped. ...
... Routers must not forward any packets with Link-Local source or destination addresses to other links. ...
... Routers must not forward any multicast packets beyond of the scope indicated by the scop field in the destination multicast address. ...



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