Transmission through AirVPN client running on router in Troubleshooting and Problems Posted ... I'm not sure where you've read from Air about not using the same port. What they said was that you shouldn't open ports on your router from the WAN interface to your LAN. That's what the router GUI does. The rules I've given you forward from TUN to LAN. Make sure your torrent client is listening on the port that Air assigns you and that that port is forwarded to the proper IP address with the IP tables. The port checker will show the port as closed if there is no server listening on that port. Finally, it's best to SSH into the router and paste in the correct IP tables at the prompt. I don't know if your other method works.