Error 52100 Mario Kart DS

i bought a DSi after a while since I lost mine, and my friend and I decided to play it online but they live in Venezuela and I live in Mexico, so we are trying to set up the wiimmfi network but i keep getting the error code 52100. i use a 2.4 ghz wifi setting on configuration 1 and open network I set up on my modem, when I set the dns it just stays loading and it won't connect before dropping the error code.