Comment on Discord lowers free upload limit to 10MB: “Storage management is expensive”

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KillingTimeItself@lemmy.dbzer0.com ⁨2⁩ ⁨months⁩ ago

that’s literally what a stateful firewall does.

It only allows corresponding return traffic to outgoing traffic that a device has internally sent outwards.

if you disabled that, it wouldn’t do that. But even a NAT without a stateful firewall might end up doing this depending on how it’s configured and your open ports due to how the forwarding is handled. This is how we get around NATing for P2P traffic, though the trick is to just send two NATed users to the others ip and port at the same time to establish a connection that can “isAlive” from there. If you had no firewall you would only need to know the IP and port to do this.

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