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Can someone explain to me why NAT is not enough for security? (lemmy.world)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

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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?

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[–] [email protected] 13 points 7 months ago (1 children)

Security from what? Get a threat model.

A NAT will restrict connections from the internet, but won't stop attacks from your local network. As your network grows, it might be a good idea to isolate shitty IOT devices (firmware is often full of holes), home internet and sensitive devices like cameras.

[–] [email protected] 8 points 7 months ago

There are also issues like NAT hole punching and guessed port attacks that can get through NAT. This typically isn't a major problem because actually getting a connection will be very difficult but if your NIC or kernel has a bug it may be possible to trigger it with a packet or two.