Deluge Freenas purpose: https://forums.freenas.org/index.php?threads/install-deluge-in-a-jail.28778/ || https://www.reddit.com/r/freenas/comments/41fhz3/configuration_guide_for_openvpn_and_ipfw_so_that/

ipfw.rules

#!/bin/bash
# Flush out the list before we begin
ipfw -q -f flush

# Set rules command prefix
cmd="ipfw -q add"
vpn="tun0"

# allow all local traffic on the loopback interface
$cmd 00001 allow all from any to any via lo0

# allow any connection to/from VPN interface
$cmd 00010 allow all from any to any via $vpn

# allow connection to/from LAN by Transmission
$cmd 00101 allow all from me to 192.168.1.1/24 uid deluge
$cmd 00102 allow all from 192.168.1.1/24 to me uid deluge

# deny any Transmission connection outside LAN that does not use VPN
$cmd 00103 deny all from any to any uid deluge