((Unix platforms) Like Netfilter and IPFilter on other platforms, OpenBSD users prefer PF, which is their firewall tool. Its functions include network address translation, management of TCP/IP communications, and provision of bandwidth control and packet-level control. It also has some extra features like forced OS viewing. PF was written by the same people who wrote OpenBSD, so you can use it with confidence that it is well-reviewed, designed, and coded to prevent exposing similar vulnerabilities on other packet filters.)
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