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The problem is that here is a router (at a cottage), which only allows 2 connections. but we need wi-fi for 8 devices. so the plan is to create another wi-fi spot to share our connection. is there a tool or tutorial for that?

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In order for a Mac to create a local Wi-Fi network, it needs to have a wired Internet source. So what you need to do is:

  1. Connect an Ethernet cable from the router (the wired source) to a Mac.
  2. On that Mac, choose System Preferences > Sharing.
  3. Select Internet Sharing.
  4. Choose Ethernet from the “Share your connection from” pop-up menu.
  5. Select AirPort in the “To computers using” list, then click AirPort Options and give your network a name and password.
  6. Connect the other computers to the new Wi-Fi network you just created.

If needed, there are more details on this Apple help page: Sharing your Internet connection.

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You could do it with the built-in Sharing feature (System Preferences->Sharing), but it would require two wifi cards in the device acting as the bridge. More broadly, to my knowledge, it isn't possible to share a connection in the way you are proposing with a single wifi card (though you could extend the signal, it would still be limited to the same number of connections as that is bring managed by the original access point).

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  • You don't need two adapters. Internet sharing works fine with a singke adapter. – Stephen Oct 16 '10 at 18:38
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    But not from the same wi-fi you're trying to share from! Put another way - your wifi card can either be acting as a base station (which is what you do when you share through it) or it can act as a client adapter - it can't do both at the same time. – rjstreet Oct 16 '10 at 18:39
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Yes you can use Internet sharing with a single WiFi connection. Just enable it from the System Preferences. (The previous poster is wrong. I did this at my Mom's house to allow iPad and iPhone use and it worked fine.)

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  • At least on my machine, if you choose System Preferences > Sharing > Internet Sharing and then select "Share your connection from AirPort," the only options are Bluetooth and Ethernet. So no, an incoming Wi-Fi connection cannot be turned into an outgoing Wi-Fi connection. – Dori Oct 16 '10 at 23:42
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    I'm afraid I'm pretty skeptical. What were your selection is the "Share your connections from" and "to computers using" fields? – rjstreet Oct 17 '10 at 19:49
  • One possibility: my Mom's still using Tiger, so maybe that's something that changed in Leopard or Snow Leopard. It is true that when I enabled the sharing over WiFi, OS X showed a warning that I might be violating the terms of service of my ISP. Sounds like the ISPs have successfully lobbied Apple to remove the option. – Stephen Nov 8 '10 at 15:43

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