ipf and ipnat

[RYAN vAN GINNEKEN]

Hello all i use FreeBSD stable 4.11 and wish to use ipf i have been 
using ipfw with type set to open however i have recently been attacked 
and need to beef up security.  I have followed the basic setup that is 
in the freebsd handbook only differance is i added a few lines here and 
there to my ruleset.  Everything seems to work fine when i have 
ipfirewall compiled into my kernel.  When i remove the ipfirewall 
options ie IPFIREWALL, IPDIVERT  everhting seems to break.  Adding 
IPFILTER to the kernel does not help ethier.  what is going on how do i 
enable ipf and ipnat and disable ipfw and natd.  I had ipf working once 
but now it is broken and so is ipfw i have a broken bsd box please help.