In your previous mail you wrote:
It's not useless on emission, since it's not required to do
IPV6_MULTICAST_IF.
=> I believe most of us will disagree...
If you don't do IPV6_MULTICAST_IF, the meaning would
be to send via some interface in the set identified by scope_id.
=> some = one, all, any subset? This needs some clarifications of
the scope is not the link-local one.
However, when IPV6_MULTICAST_IF is done, the most you can use it for
is a sanity check and fail the send if you try to send out an interace
not in the given scope.
=> this is the only useful thing which can be done then I still think
in this case the scope ID is nearly useless...
Regards
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