After my family finally signed up for Comcast my dad decided to throttle our AP (Its a WRT54G with the standard firmware and router functions like DHCP disabled) so I wouldn’t use up all of the bandwidth. Not to much of a problem, right?

Wrong!!! The next time I tried to connect to Nintendo WFC (WiFi connection) my DS refused to authenticate. I hadn’t changed any settings on the DS. I honored the troubleshooting process and thought about what had changed the only things that had changed were the ISP(Internet Service Provider and that shouldn’t matter) and the bandwidth throttling (which shouldn’t matter either).
I had my dad disable the throttling and sure enough it worked, re-enabled the throttling and it didn’t, disabled the throttling and it worked again.
The bandwidth throttling shouldn’t matter, it didn’t effect anything else (including my Wii) except my DS and my sibling’s DS lites.
Can someone please explain why bandwidth throttling is interfering with the DS authentication with my AP?