> - With an RFC 1918 host behind a firewall, compromising the firewall is
> enough to grant that host outside access. Single point of failure.
> 
> - With a site-local only host behind a firewall, this become a double
> hack thing: you need to reconfigure the firewall _and_ reconfigure the
> host to give it a public IP.

Why do you believe this makes a difference?  Wouldn't site-local
traffic be just as likely to leak into an ISP as RFC1918 traffic?
Better isp's will filter it out in their border routers; others won't
bother.

                                - Bill
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