Introduction: OpenBSD - Packet Filter/PF Rules Diagram

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PDF and PNG diagram of how packet filter rules work with OpenBSD.

Simplied text version below: 
pass          in        on egress      TCP     from any    to 192.0.2.12      port 80
 ^            ^            ^            ^          ^	        ^	         ^
What to  | Direction |  Interface  | Protocol |  where   |  IP connection |   connection
do if                				 traffic    on local  	      port on
rule						 coming     machine or	      local
matches						 from	      "any"	      machine

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