> 3. They cannot be externally routed (Some would
>    consider this to be a minus as well).

> I believe 1 and 2 can be solved (fairly) easily by other means.  The big
> problem is number 3. The ambiguity is essential to preventing them from
> ever being routed.  

so, i'm not conviced that we have this third property adequately
written down in the existing site-local case.

The ambiguity means that you can't count on them working, but because
of the likelihood of configuration error plus the likelihood that
many/most routers will forward site-locals by default, you can't count
on them reliably not working, either!

                                                - Bill
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