Nintendo DS and Apple wifi connection

Hi ti all,
my double ethernet Apple access point is working correclty with my iMac.
I tryed to use my nintendo DS but without luck.
The router is discovered by DS and the WEP authentication is working but ...
this is the errors message during the test connection:

erify that your router is connected to the internet when attempting to connect to the Nintendo Wi-Fi Connection. If you are not able to access the internet on your computer, then there is a problem with your internet connection. Contact your Internet Service Provider (ISP) for more information.

If your router has a built-in firewall that interferes with the necessary transmissions from the Nintendo DS, then your router may not be compatible. Click here to view our list of known supported routers.


Please help.
Giuseppe