The 3DS might override the DS settings if the DS settings can't work. I don't know man. -shrugs- I don't own a 3DS to test it out. All I'm aware of is that you need to adjust the DS settings for it to work. When I get a 3DS, well, if I get a 3DS, I'll see what I can do. Until then, though, you're unfortunately on your own. I can only offer suggestions. Try temporarily disabling your router security and try again with your DS settings. If they work, then perhaps that might be what you need, otherwise I think the 3DS might just give a connection without the ability to modify the options, which would be horribly stupid programming on nintendo's part.