Packet Filter Control Program

All packet filter management is handled via pfctl(8). This program will show you the current packet filtering settings, connections that are being processed by PF, the current state of various TCP/IP transactions, debugging information, and any other information you might possibly want to know. Here and there, you will see discussion of how the packet filter control program can be used in conjunction with various sorts of rules. Much of Chapter 19 is devoted to pfctl(8).