ok, so no need to block nintendo servers/ip/adresses? Thanks
You should block nintendo addressed on the router. You can also use the DNS block, but when I was using my Wii U today, I noticed nothing was resolving, so the setup DNS I was using might be having an issue. I already have blocking the following addresses for device with my Wii U mac address.
nus.c.shop.nintendowifi.net
nus.cdn.c.shop.nintendowifi.net
nus.cdn.wup.shop.nintendo.net
c.shop.nintendowifi.net
nus.wup.shop.nintendo.net
nus.cdn.shop.wii.com
nintendowifi.net
nintendo.net
wii.com
google.com
Google I block so I can check using the Wii U browser if my restriction is working.