The kernel module usually reports its version when loaded. On FreeBSD:
cd /usr/src make buildworld make buildkernel make installkernel reboot # After reboot: make installworld
(where 1400000 indicates FreeBSD 14.0)
to validate your syntax and keeping an eye on release notes for your specific BSD flavor, you can avoid the "syntax trap" and keep your network secure. Are you running into a specific error message right now? Share the error
First, disable pf temporarily: