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Ditto to what Peter has already noted, but to add, if you used a "private" cloud technology, e.g. frame-relay, ATM, MPLS, MetroE, they too all generally allow you to use private IP addressing and avoid the need for NAT. Additionally, if you use a tunnel across the Internet, it would have a pair of public IPs, but the tunnel, and the internal networks it supports also can generally use private IP addressing and there's no need to NAT.
