Thanks for your time.
I have added iptables rules and all good now
I had entware at my stock asus router system for deluge torrent.
I guess i can run a script at router boot with entware to add those iptables.
Cheers
Edit: I accomplished to add those iptables rules automatically after boot at stock AsusWRT.
So now my router forwards my AirVPN opened ports to my PC.
I had a 2 day trial to test it out.
And few mins ago i purchased for 3 years
Thanks again.