Different games use different ports to communicate. But the first thing for you to do is to set your console to have a Static IP. I don't know the device so I can't tell you how. But, remember that it needs to be in the same subnet as your other DHCP devices. And preferably outside the DHCP scope.
I did find a link HERE, that describes how to forward all ports to your Nintendo. However, I, personally, would never forward every single port to a device. I'd figure out which ports each game uses and forward those. As in case of "Super Smash Bros". That uses the following TCP ports
IP: 6667,12400,28910,29900,29901,29920
It may also use UDP ports? But those I'm not sure of.
Good Luck.
I did find a link HERE, that describes how to forward all ports to your Nintendo. However, I, personally, would never forward every single port to a device. I'd figure out which ports each game uses and forward those. As in case of "Super Smash Bros". That uses the following TCP ports
IP: 6667,12400,28910,29900,29901,29920
It may also use UDP ports? But those I'm not sure of.
Good Luck.
