> Exactly.  Perhaps I'm over-abstracting...but it seems to me
> like a globally-unique site-id is just another form of a global
> address.

of course it's a global address.  but that doesn't mean it's globally
routable.
 
> I think there are lots of reasons not to make these site-ids globally
> unique, if we choose to adopt them.  

name one.

> For instance, how does an
> ad hoc, disconnected network get a site-id?  

that's not a reason, that's a problem to be solved.  there is every
reason to believe it can be solved as long as we can get enough 
bits for the site-id.

similarly the routing table concern is a valid concern that has
to be addressed, but in a way the mechanism is its own solution,
since there's no way that ISPs are going to even attempt to route 
every site-specific prefix in existence.    those that try will
quickly lose, thus solving the problem.

> Maybe it doesn't need one.

there's no way to know.  most sites currently using v4 private addresses 
probably didn't realize the mess they were getting themselves into either.

> What about my home?  Do I have to go to my ISP or ICANN to get a
> site-local ID for my home?

why not just get it for free with your cable modem/router/whatever?

Keith
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