First, you may not need to open any ports on your router. Nothing needs to be able to come from the internet to the controller. The controller just needs to be able to access to the internet. In fact, I would advise against opening up any ports to the controller. There is more setup information on the avalon controller at the following links:

• https://canaan.io/question/how-do-i-connect-an-avalonminer-721-and-avalonminer-controller-including-raspberry-pi-1-2-and-3/ - Skip to "Configuration Controller"
  
• https://canaan.io/question/are-there-instructions-for-how-to-setup-avalonminer-741/