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Re:Why you need IPv6 by takeda on Thursday May 24, 2018 @01:24AM (#17141315)
What you are talking about is PAT. PAT unlike NAT requires firewall to operate.

What he pointed out is that if you have a firewall you can provide security through that, you don't need NAT or PAT.

In fact having just a firewall is safer, because it is simpler

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