Mac connected but PC can't connect to internet through Airport Extreme

When I was using a dial-up connection everything worked fine on both computers but since I changed to a PPPoE / Ethernet connection my PC using Windows XP can't connect to the internet although is connected to the Airport with excellent signal.
In System Preferences>Network I have Connect using PPPoE option checked so I can't see my airport in the Airport Admin Utility. Apple Talk is Inactive.
In System Preferences>Sharing>Internet: Internet sharing is Off and there's a text that it can't be turned on "because there are no ports available over which to share your connection"

I understand, but for some reason, that I'm trying to
figure out, when I uncheck the PPPoE option on my
computer and my base station appears in the Admin
utility, I loose my internet connection on the
macintosh although the Network Status says that I'm
connected to the internet via Airport...
You will need to configure the Airport to connect via PPPoE.
iFelix

Similar Messages

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    Power-up the AirPort base station; wait at least 5-10 minutes. Note: The AirPort's status light may continue to flash amber after it has intialized. That is because, there may be some additional configuration items necessary, like setting up wireless security, before the overall setup is completed to get a green status.
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    In this basic configuration, the AirPort base station will broadcast an unsecured wireless network with a Network Name (SSID) of Apple Network NNNNNN. Network clients, connected to the base station either by wire or wireless, should now be able to access the Internet through the ISP's modem. Once Internet connectivity has been verified, you can use the AirPort Utility to configure the base station for wireless security and any other desired options. Please post back your results.

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    Robin Berman wrote:
    I still can't connect wirelessly via airport extreme.
    Using a Powerbook running 10.6.4
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    Howdy TrumpetCharlie,
    We've an article that can help get your WiFi working normally again.
    Wi-Fi: How to troubleshoot Wi-Fi connectivity
    http://support.apple.com/kb/HT4628
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    Hi danacordelia717:
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    You only have to clone your mac when using certain cable modem.  You don't clone your mac when using dsl.
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