wheel - 2:21 am on Feb 2, 2010 (gmt 0)
No, you would not. You'd simply contact the 'light fixture client' behind your NAT, using your one-and-only public IP address.
With few exceptions, this same process could apply to every website being served from the entire data center my server is located in.
There's no reason webmasterworld needs it's own unique IP address. It could resolve to the main rackspace IP, and then rackspace could figure it out from there.
My entire 'empire' of domains and servers could all be run off of one IP with the exception of the SSL certificate stuff. But I've actually go websites spread across dozens and dozes of IP's. Not that I'm going to change :).