Apple has added a new article to the Knowledge Base explaining how to share share an AirPort internet connection to clients connected via ethernet. Appleis Knowledge Base (sometimes referred to as the KBase) is a central location for all of Appleis support documents and other important information.
If you need to share an AirPort connection out to computers connected with ethernet, the Internet Sharing preference panel will not allow you to do so unless AirPort is set to the highest priority. From Apple:
The Internet Sharing preference pane does not allow you to share your AirPort Internet connection to wired Ethernet clients.
- Mac OS X 10.2 and later
At the sharing computer, drag AirPort to the top of the port configuration list:
- Choose Apple menu > System Preferences.
- Choose View > Network.
- Choose Network Port Configurations from the Show pop-up menu.
- Drag AirPort to the top of the port configuration list.
- Click Apply Now.
In the Internet Sharing preference pane, you should now see this message:
"You are connected to the Internet over Airport. This connection will be shared with computers connected to Built-in Ethernet."
You can read the full Knowledge Base article at Appleis Web site.