manual page | zpool-features

[Fbsd8]

snip
> 
> Actually, I am becoming suspicious that FreeBSD does not maintain a 
> OpenBSD Packet Firewall that survives upgrades.  Perhaps I should just 
> take all of the Packet Firewall stuff out of my kernel and learn to use 
> ipfw2.
> 
> 
> Darrel
> 
> 

On the subject of OpenBSD Packet Firewall

OpenBSD 4.5 version of PF firewall which is included with the base 
FreeBSD 8.x and 9.x releases is no longer supported by OpenBSD and very 
back level.

The most current version of OpenBSD is 5.1. PF version 5.0 changed the 
syntax of the NAT statement making PF no longer backwards compatible 
which breaks some Freebsd standard, so updated versions of OpenBSD PF 
will no longer be mass ported to FreeBSD. Any bug fix code to OpenBSD PF 
will have to be incorporated by hand into FreeBSD's version of PF from 
this point on.

The following will shine some more light on the subject.

http://www.freebsd.org/cgi/query-pr.cgi?pr=167057

http://lists.freebsd.org/pipermail/freebsd-pf/2012-September/006740.html