I'm a bit confused about OS X Mountain Lion's Application Level Firewall.
I have enabled ALF (Application Level Firewall) in Settings -> Secuity & Privacy -> Firewall and have some rules for some applications in it and those rules are stored by ALF in
But it seems that
ipfw is disabled (no /etc/ipfilter) and
sudo ipfw list is
65535 allow ip from any to any.
pf is also disabled.
So I do not understand how ALF works. If ALF does not use the known legacy firewall applications, how does it do what it does? What does it use for a backend or is it a totally separate application that does not deal with