A very hidden and somewhat unused feature of Mac OS X is the internet sharing application which can be found in System Preferences > Sharing > Internet Sharing. This feature is very basic and easy to setup but it allows you to share the incoming internet connection on your Mac with other computers in your vicinity. You can even turn your Mac into a wireless hub using this feature. We’ll help show you how to set this up properly in this guide, along with a step by step tutorial of how to use your Mac’s internet connection in order to get your Xbox 360 online without having to purchase a wireless adapter.
The first step is getting familiar with Internet Sharing. As mentioned above, you need to navigate to System Preferences > Sharing > Internet Sharing (which is an option listed on the left). Once on the Internet Sharing option page, you need to setup exactly what you want to do before you proceed to turn it on. As you can see, you need to select where you want the shared connection to come from and then where you are going to output it. So, if you want to turn your Mac into a wireless hub, you would select “Share your connection from: Ethernet”…”To computer using: Airport”. You can mess around with any configuration here including Airport to Ethernet, Bluetooth to Ethernet, etc. In order to enable it, you must click the check box next to internet sharing. You can now turn your Mac into any sort of internet hub that you want it to be. This works great when you are somewhere such as a hotel which might only have one Ethernet plug but you have 4 laptops. You can create a wireless hub for everyone else in the room to connect to.
One of my favorite uses for this feature is sharing my MacBook’s Airport connection with my Xbox 360 through an Ethernet connection. I have been doing this for years, and it has saved me the $100 I would have had to spend on a wireless adapter for my 360. Here is a step by step guide on how to setup your Xbox 360 to share an internet connection with your Mac:
1. Enable internet sharing as described above in System Preferences. You will want to select sharing from Airport to Ethernet.
2. Connect your Mac to your Xbox 360 using an Ethernet cable.
3. Open up Terminal on your Mac by going to Applications > Utilities.
4. In terminal type “ifconfig en0″ (that is a zero)
5. In the terminal screen, you need to look for the line which displays as “inet xxx.xxx.xxx.xxx”. Write this number down. For example, mine is currently 192.168.2.1
6. Also get the IP Address of your wireless router. This can be found in System Preferences > Network> Select Airport > Advanced> TCP/IP Tab > Router. Write this number down. Mine was 10.0.1.1
7. Start your Xbox and get to the Network Settings menu. You will now have to put some numbers in manually…
8. For IP Address you need to enter the inet number you found in your terminal but with the last number being 1 digit higher. For instance, mine would be 192.168.2.2
9. For Subnet, enter 255.255.255.0
10. For Router/Gateway enter the inet number from earlier. Mine was 192.168.2.1
11. For DNS (both primary and secondary) enter the IP of your router. Mine was 10.0.1.1
12. You need to leave PPPoE and advanced settings blank (default was off and automatic).
13. Test the connection and enjoy having a shared internet connection to your Xbox from your Mac.
If you need any help with this, please leave a comment and I’ll get back to you.