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I have a WiFi connection and I would like to share it through my WiFi card to computers. For some security reason, it seems that only one device can access the WiFi connection directly.

This is why I want to use the first mac computer as server.

Unfortunately, I don't have any Airport Express.

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You cannot be connected to two wifis with only one interface. If you want the same machine to connect to your real wifi network and create or join an ad-hoc network with your other machines: This will not work. – Daniel Beck Jan 16 '11 at 17:48
@Daniel Beck is correct, to share over Wi-Fi you would need to be connected to your router using an ethernet cable and then set up a new wi-fi connection for sharing. – Jay_Booney Jan 16 '11 at 19:20
You can also share the WiFi connection via Firewire, probably not helpful in this situation but good to know. – penguirl Jan 17 '11 at 2:23
@Daniel Beck and @Jay_Booney are not correct – otherwise, how could Connectify on Win7 share a Wifi connection [1,2]? @Arkan: Unfortunately I don't have a solution for you for Mac (was searching for one myself) but was compelled to correct the above comments. [1] connectify.me [2] techrepublic.com/blog/networking/… – orangechicken May 11 '11 at 3:52
@orangechicken Connectify works by specifically requiring Windows 7 internals (no support for earlier Windows versions) and needing to support the network hardware to be able to create an AP, via the article you linked. As this question is specifically for OS X, my assessment still holds. – Daniel Beck May 11 '11 at 5:29
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Unfortunately, you can't. You can't take your connection from WiFi and share it to other devices via WiFi. You can think of it as plugging two ethernet cables into one port. It won't work.

You can, however, take your connection from ethernet and share it to devices using WiFi.

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Thanks for your answer. Do you know if it could be possible with the bought of a device ? – Arkan Jan 17 '11 at 21:36
@Arkan: Maybe a Wireless Repeater would do what you need? – Wuffers Jan 17 '11 at 22:07
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