pf because it's the easiest way I've ever been able to configure such things.
The configuration file has a language of it's own that is nice and neat -- which I like. I especially love the good section in the manual that outlines the pf.conf syntax in Backus–Naur Form (BNF), well once I figured out how to read BNF anyway :\
Not to mention it runs on the two operating systems I use most, FreeBSD and OpenBSD :-)
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My Journal
Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''.
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