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Originally Posted by MrSelfDestruct
I've fallen behind in networking technology, but an IT professional gave me a good, complete explanation of why NAT is not secure enough to block anything but the simplest attacks. True to my style, I promptly forgot the explanation, but I can try to figure out who it was who explained it and get a summary again.
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My understanding is (unless you have blocked it via a firewall setup) that requests from the internet are broadcast to all nat clients, assuming it was not initiated from one of the nat clients (in which case the nat router points it back to the original requestor). For that reason NAT is not really any protection at all.