IPFW survived until OS X 10.9, then it’s been officially removed from OS X 10.10. Both PF and IPFW were installed but PF was the preferred choice according to OS X man pages, even if IPFW was the preferred choice for Mac OS X Server 10.7, according to Apple corporate web site. OS X 10.7 officially introduced a new network firewall, PF, and deprecated the old IPFW. On the other hand, Mac OS X Server featured a very simple IPFW graphic front end. Apple started changing it’s firewall policy with Mac OS X 10.5, introducing a built in application firewall, ALF, that can be configured from System Preferences Security preference pane, while IPFW can be configured only using the shell Terminal. Directly derived from other less- known operating systems like *BSD, IPFW has been the default OS X firewall from Mac OS X 10.0 to Mac OS X 10.6. OS X from the very beginning shipped with a pre-installed firewall named IPFW. It features a solid UNIX base and a lot of security features. OS X is one of the most secure computer operating systems today. Everything is managed by visual elements like buttons, collections, lists, icons, leds. There is no need to learn code syntax or to type shell commands. Filtering rules and networking options can be set dragging and dropping icons, changing their order, and selecting check boxes. It’s main purpose is to speed up network firewall configuration and testing, using a simple interface. Murus is a front end for the OS X built-in PF network firewall.
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