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By "built-in" I mean the backend of the System firewall (System Preference->Security&Privacy->Firewall). Is it ipfw or pf? (I know that ipfw was the backend for previous versions of OS X).

And, what are the commands/logs that I can use to determine which firewall is running?

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The firewall in OS X 10.9 is now "pf".

It is controlled by the tool pfctl which can also give you a lot of status about the firewall itself. Try sudo pfctl -s all and you will get a huge dump of info. If you want a lot of information you can add one or two -v to the front of the options for even more info - sudo pfctl -v -v -s all

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