Networking noob here. I want to prevent all incoming requests except through a specific port, and that traffic is forwarded to a specific device on the network. NAT seems to do that just fine, it’s almost like a kind of firewall by itself. What kind of threats are there that requires more than just NAT for security?
For incoming traffic on IPv4 only, NAT technically is fine. But it won’t block any outgoing traffic, and IPv6 doesn’t use NAT at all.
IPv6 can use NAT; there are some unfortunate souls out there whom are only getting a /128 (one address, basically) by their ISP, instead of a /64 or /48
Not entirely true! It uses a type of NAT to translate IPv4 addresses into comparable IPv6 addresses.