If you are trying to make any of the Westell routers (such as Westell model # 2410, and P-327W), the first thing you should do is to set 802.11b rates for both 5.5 and 11 to Y (instead of B). Then set authentication to Shared mode, turn off 4x accelerator, install the latest firmware on your Westell router, and try again.

Most of the newer Westell ADSL/Wired/Wireless gateway products support many advanced features that are neither needed for uplinking your Nintendo DS using wireless, some of them are outright in compatible with the (older) 802.11b based wireless client interface currently being embedded within Nintendo DS gaming consoles.

To setup a wireless link between your Nintendo DS and your Westell Wireless Router, you need to configure one of the three Connection Save Files (on your Nintendo) using parameters (as in terms of SSID identity, Network Address, Netmask, Password, WEP Key –if any, etc.) that are similar to (compatible with) how your Westell Gateway device is setup.