If You Came from Elsewhere
If you are reading this because you are considering moving your setup to PF from some other system, this section is for you.
If you want to use PF, you need to install and run a BSD system such as OpenBSD, FreeBSD, NetBSD, or DragonFly BSD. These are all fine operating systems, but my personal favorite is OpenBSD, mainly because that is the operating system where essentially all PF development happens, and I find the developers’ and the system’s no-nonsense approach refreshing.
Occasionally, minor changes and bug fixes trickle back to the main PF code base from the PF implementations on other systems, but the newest, most up-to-date PF code is always to be found on OpenBSD. Some of the features described in this book are ...
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