Today at work during my lunch break I quite fancied a quick go on Mario Kart DS, I have been quite addicted to Mario Kart Wii recently, especially the online play and having a DS and copy of MK at work the only thing I was lacking was a WiFi connection.

I take my Mac to work and connect to the Internet via a wired LAN connection, this leaves my Mac's WiFi card free to use for sharing my Internet connection with my DS. There are a few pitfall's that one can encounter when doing this so this news post is just a quick guide written in the hope that someone else may stumble upon it and find it useful.

I'm using OS X Leopard so things might be a little different if your running a different version of OS X.

Open System Preferences and then Sharing
Select Internet Sharing but do not check the check box, if it is already checked, uncheck it
Open AirPort Options
Give a name for your network in Network Name, this is the name your WiFi network will be broadcast under
The rest of the parameters are options but it's advisable that you add a 128 bit WEP key, find an online WEP Key Generator, generate a 128 bit WEP key and copy and paste it the Password and Confirm Password boxes along with keeping a note of it as you'll need to enter it into your DS soon.
Nearly done with the Mac now, just check the checkbox next to Internet Sharing and choose Start on the following prompt and we are done here.
Fire up your DS with WiFi an enabled game of your choice and find the Nintendo Wifi Connection Setup screen. Your games manual will tell you how to setup a Wifi connection and give you further details of this.
Select the big blue Nintendo Wifi Connection Settings button, select an empty collection slot, either Connection 1, Connection 2 or Connection 3. Select the Search for an Access Point button.
Your DS should list the network you just created on your Mac, you should see it listed under the name you gave it.
Select your network and enter a WEP key if prompted.
Your DS will now try to test your connection settings but will fail, moaning about being unable to obtain an IP address. The Mac has an odd way of dishing these out which is not compatible with quite a few WiFi devices but I digress.
Select ok and then select the connection number you just used, e.g. Connection 1. You should be presented with a list of settings.
Change Auto-obtain an IP Address to No. Under IP Address enter 10.0.2.10 under Subnet Mask enter 255.255.255.0. Under Gateway enter 10.0.2.1 and finally, under Primary DNS enter 10.0.2.1 leaving Secondary DNS blank.
Select the Test Connection button at the top of this settings screen, hopefully it will be successful this time round.
Save your settings, go back to your game and enjoy!

[EDIT] I just tried this again today but with a Sony PSP. The good news is that it works and better still there are less steps. Just follow the steps for setting up Internet connection sharing on your Mac, then setup a wireless network in the normal fashion on your PSP. There are no special configuration options needed

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