>
> | (Noting here that site-local addresses doesn't eliminate
> | renumbering...you still will have to merge sites from time to
> | time.)
>
> In that case, NAT doesn't help either - if the address spaces are to
> be merged, then there can't be any NAT between them.
>
No...what will happen is that the site internally uses some globally unique
address space, but shields that space from renumbering by using NAT between
it and its ISP(s). When two such numbered sites merge, there is no
renumbering because each already uses a globally unique address space.
I've sometimes wondered why IPv6 doesn't have some number space that is
"globally unique but not globally routable" that could be used for packets
internal to a site.
PF
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