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

submitted 9 months ago* (last edited 9 months ago) by nodsocket@lemmy.world to c/selfhosted@lemmy.world

23 comments fedilink hide all child comments

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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[–] cron@feddit.de 3 points 9 months ago* (last edited 9 months ago)

This is true and typically called "Next Generation Firewall" or "Intrusion Prevention System".

However, these have three disadvantages:

They rely on signatures and many vendors only provide these with an active, costly subscription
They add complexity and possible error sources and false positives.
They require processing power and can easily reduce throughput by 90%.

These systems are quite common in enterprise scenarios, but AFAIK the exception in home labs and selfhosting environments.