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The only place NAT should be allowed is lab/experiment networks, where you might need to duplicate a production IP range.

"But what about the office network, there is no reason that anyone should ever need to connect directly to an office PC". Once you use NAT there, your IP telephony software needs fragile workarounds just for Sally in marketing to be able to call Alice in legal. And in the next version, those fragile workarounds will be replaced with a cloud service that sells your trade secrets to your competitor.

"But Skype just works". Skype is a great example of the above, it used to have all kinds of NAT workarounds, now it goes via a server where Microsoft listens in on your calls.

#NAT #IPv6