The Private IP address space stuff was originally done in RFC 1597.

There is a reply entitled "Net 10 Considered Harmful" in RFC 1627.

The final version became RFC 1918.

Use of Private IP address space should only be used when there are no
alternatives, and the network managers involved are sufficiently savvy to
understand the tradeoffs that are being made.

NAT is Evil, because it violates the End-to-End model that the Internet was
built on: smart ends, stupid middle, with particular emphasis on the middle
just moving the bits correctly, and not trying to second-guess the
applications (server and client) on the ends. You can imagine what happens
when a second-guessing middle guesses wrong...

	Erik <fair@clock.org>