The scope value is [0..F], but 0 and F are marked as "reserved".

Usually "reserved" values in protocols can be handled by "ignore on
receive, zero on send".

However, with scope and scoped addressing, I just can't ignore it on
receive. What should I do with addresses starting with

  FF00::/16
  FF0F::/16

a) when receiving a packet using those as destination.

  My first assumption: Drop it

b) when application requests sending a packet to such address?

  My first assumption: reject with error

Above logic will be hardcoded in all stacks, so anyone thinking later
of redefining the meanings is severly limited.

Just wanting to verify that I can do it in above way. Actually, only
the value 0 is the problematic one (for 'F' I can just pretend that it
is just another level above global, like universal :-).


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