If you still can't connect because it can't acquire youre dhcp do the following.
Found the solution
In a wifi game you need to go to the settings and enter the settings manually for your connection.
so you need to enter the wifi settings for your connection and select no for auto-obtain ip address.
Now to find this info if using XP
click start > run and type in
cmd /k ipconfig /all
and press enter.
You will need to enter the IP Address of the DS - this will be the same as the IP address shown by doing the above but change the last number to anything between 0 and 99, i used 5 so my ip entered is - xxx.xxx.x.5
the subnet mask is under the ip address in the command window
Gateway is under the subnet mask
Then the Primary and Secondary DNS should be just below.
Now to run Beup or any other wifi app you need to start a wifi game.
For example mario kart, connect to the ds wifi and then reset your DS. RESET, do not turn it of or it wil not work.
I have a supercard so i press the button combination.
Now run BEUP or any other program.
It should connect.
I only have one so I entered the same for both and it worked fine.
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