I'm wondering how do i set up a fire wall for mac. is there a program or somthing?

i'm wondering how do i set up a fire wall for mac. is there a program or somthing?

OS X already includes a software firewall. Enable it in System Preferences > Security & Privacy.
If you are using your own wireless network you are already beyond a hardware firewall, so it is unnecessary and redundant to enable it. Its use is justified if you intend to connect to a public network, or are otherwise using a LAN along with others who may not be trusted.

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