Well, I've not yet fully gotten into issue of getting site local
addresses from the name server, but...

... I assume when a resolver gets an address as a reply from the DNS,
it will supply the scope id from the interface which the DNS reply
came in. And, this applies to all scope levels (consider, multicast
groups could be in DNS too, with any of the 15 or so scope levels).

Now, for this to truly work, the DNS server does need some extra code
to deal with non-global scopes. The database must include the scope in
some form (for example interface name), and it must not return replies
of non-local addresses to other than indicated interface.

However, this seems to be a local implementation issue, which does not
change the protocol on the wire.

I think similar considerations apply to routing protocols: the zone
ids are always available from the interface which the packet is
using. Of course, some system admin must configure them to the
interface first.





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