How to share a wireless connection from a Mac to a Nintendo DS (for OS X 10.4)

1. Make sure you're connected to the internet via something other than the AirPort card (i.e. Ethernet).


2. Turn on Internet Sharing:
   
   
   
   • Go to System Preferences, click on the Sharing icon, then click on the Internet tab.
   
   
   • Change the Share your connection from: pop-up to Built-in Ethernet.
   
   
   • Under the To computers using section, check the AirPort box.
   
   
   • Click AirPort Options...
     
     
     
     • Enter an easy name such as nds. Leave all the security options blank -- implementing security is an exercise left to the reader -- then click OK.
       
     
     
   • Click Start in the Internet Sharing panel.
     
   
   
   For sharing internet access with other computers, this is usually sufficient. However, the DS doesn't play well with the built-in DHCP server, so we have to manually configure the DS. To do this we, must gather some info...


3. Gather Information:
   
   
   
   • Open Terminal.app and type ifconfig en1. In the output...
     
     
     
     • Look for: inet xxx.xxx.xxx.xxx netmask ...
     
     
     • Take note the IP Address (the x's) associated with the first inet (mine was 10.0.2.1; yours may be different).
     
     
     
     
   
   
   
   
4. Configure the DS:
   
   
   
   • Edit your Nintendo Wi-Fi Connection Settings from within a compatible game.
   
   
   • Select a connection to edit.
   
   
   • Choose Manual Setup.
   
   
   • Enter the following parameters:
     
     
     
     • SSID: nds (or whatever you chose in step one)
     
     
     • Auto-obtain IP Address: No
     
     
     • IP Address: Take the first IP Address you obtained earlier, and make the last digit bigger. i.e., mine could be 10.0.2.7
     
     
     • Subnet mask: 255.255.255.0
     
     
     • Gateway: The first IP Address, unchanged. (e.g. 10.0.2.1)
     
     
     • Auto-obtain DNS: No
     
     
     • Primary DNS: this is the IP Address of the Airport. This is not the server address found with dig in Terminal. Again, mine was 10.0.2.1.
     
     
     • Secondary DNS: blank.
     
     
     
     
   
   
   • Test Connection in the upper right corner of the touch screen. This should work, and you should get a Connection Successful message and be returned to the Settings page.
   
   
   
   


5. Save Settings and click Back twice.

Disclaimer: I will accept no responsibility for the use or misuse of software or hardware, for any damage that may be caused by the software or hardware. I am not responsible for any charges you may incur from your cellular provider as a result of using this instruction set.

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Original articles from macosxhints.com:

1. How to share a wireless connection with a Nintendo DS


2. Set up Nintendo DS surfing via PowerBook and Treo 680
   

note: I gathered references from these 2 articles and made a little adjustment myself, so that the instructions are clearer. Enjoy ur WiFi now, MAC USERS FTW!!!