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My MacBook is connected to Internet.

I want to share this connection with another MacBook via WLAN.

How do I achieve that?

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Is your MacBook connected with WiFi or Ethernet? – user588 Feb 28 '11 at 22:59

If you are using your WiFi to connect to the internet, you cannot use it to also create a local network for other computers. If you are networked via something not-Wifi (Ethernet, FireWire, USB, etc.) then you can share your connection via WiFi.

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  1. Go to System Prefs > Sharing.
  2. Select your existing connection under Share your connection from:
  3. Select Airport under To computers using:
  4. Turn on Internet Sharing with the checkbox on the left.
  5. The network name will be the name of your computer.
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Isn't this kind of dangerous, this way you set up an totally unsecured acesspoint. Can it be secured? – bitbonk Dec 31 '11 at 7:50
When you turn this on you are prompted to enter a password. – cleverbit Jan 27 '12 at 10:41
@richarddas the password doesn't secure the network, it just makes sure you are an admin when you turn it on. – user588 Jan 27 '12 at 17:29

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