http://gpp6nwvsps43b3mfacsh433uroo6uyjvvpr6tgj4jh4n5ngxt7rqbvid.onion/posts/double-vpn-pfsense.html
After the changes are applied, there will be either four or six rules: two for localhost to WAN IPv4, possibly two for localhost to WAN IPv6, and two for LAN to WAN. Add a new rule for interface OPT1 , with source equal to your subnet 192.168.100.1/24 .