Answer by user2707001 for Command Line Firewall
There is, and it comes with macOS by default.Little Snitch is an application firewall, that's a whole different story. It blocks applications from accessing the network.Assuming you want to block ports...
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I have decided to add a firewall to my computer and have heard of applications such as 'Little Snitch' which help to give me control of inbound and outbound connections on my mac running macOS Sierra....
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