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My Macbook Pro using a Wifi internet connection & I would like to share this connection to other systems in my house. When I tried to configure by myself I don't see the usual "airport" option to create the ad-hoc connection.

How can I do this in lion OS X?

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I took out the question about your router; it is a separate question from the one about the ad-hoc network. – Nathan Greenstein Sep 24 '11 at 15:03
OK, it's fine for me. – linguini Sep 24 '11 at 15:05
up vote 4 down vote accepted

You can only share Internet from an Ethernet, Bluetooh, or FireWire connection over Wi-Fi.

That's because you can only use your Wi-Fi connection for one thing at a time. If you're connecting to the Internet over Wi-Fi you won't be able to share that connection over Wi-Fi.

If you've got Share your connection from: set to Wi-Fi, it's normal that To computers using: doesn't have a Wi-Fi option:

enter image description here

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Based upon my understanding of your description of the problem, this is not a question of configuring your MacBook Pro. If you have a Linksys E2000 WiFi router, you do not need to share the Internet connection "ad-hoc" from the MacBook Pro. In fact, this would be counterproductive.

This is a matter of learning to use your Linksys E2000 router to connect multiple computers to your Internet connection. Here is a link to the support page for the Linksys E2000. You can read the user manual and the FAQ.

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