Pfctl -p device "Operation not supported"

[shamuel_]

I had read the "PF: Firewall Management" by dhartmei in OpenBSD journal (http://undeadly.org/cgi?action=article&sid=20060929080943) and then I tried create other device to pfctl operation.

[2.3.2-RELEASE][root@frw01.localhost]/root: id
uid=0(root) gid=0(wheel) groups=0(wheel),2(kmem),3(sys),4(tty),5(operator),20(staff),31(guest),1998(all),1999(admins
[2.3.2-RELEASE][root@frw01.localhost]/root: mknod pf c 73 0
[2.3.2-RELEASE][root@frw01.localhost]/root: pfctl -p /root/pf -s info
pfctl: /root/pf: Operation not supported
[2.3.2-RELEASE][root@frw01.localhost]/root: ls -lah pf
crw-------  1 root  wheel  0x4900 Sep 28 13:08 pf

When I try use the pfctl -p "device" option, I received an error "Operation not supported" is there any recommended action to troubleshooting this problem? Is there any material to guide me solve this problem?

Thank you!

[battles]

Possibly: pfctl -p /pf -s info

[shamuel_]

The answer for this question:
https://forums.freebsd.org/threads/57857/

Thanks!