Yes, since my router has cached the MAC it's always 192.168.0.115 for now. And as I said the client does somewhat detect that the TCPGecko exploit is running. When I enter a wrong yet pingable and existing IP from my network that is not a Wii U it waits like 1 second before trying again and failing after 3 times, however when I enter the real Wii U ones it waits roughly around 5-8 seconds before making another try. So something weird is going on here...
I'm kinda sad that it won't run because I'd want to have so much fun with it