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Internet Sharing from my MacBook Pro (10.6.6) to other WiFi devices works fine.

But the moment I turn on the VPN connection (PPTP) on the Mac (which I would also like to share), the other devices cannot access anything anymore (everything works fine on the Mac itself).

What do I do?

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up vote 1 down vote accepted
+50

OS-X treats a VPN connection as a totally separate connection from the device (airport, ethernet) it is transported on. So when you turned on your VPN, your airport or ethernet connection was no longer active.

If you want to share the VPN connection, you have to set up sharing for it the same way you did for your primary, non-VPN connection. They behave totally separately, for sharing purposes.

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I'd suggest you follow the excellent blogpost by Rodrigo at http://rodrigo.sharpcube.com/2010/06/20/using-and-sharing-a-vpn-connection-on-your-mac/

Worked for me.

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+1 I'll give that a try. Those manual settings for ipfw do not persist anywhere, right? (I don't want to break anything). Do I need to reboot to flush them out again, or just a VPN disconnect? – Thilo Mar 17 '11 at 12:56
    
in order to "flush" just issue a: ipfw -q flush, no need to reboot. – Martín Marconcini Mar 17 '11 at 14:50
    
Martin is correct, no need to reboot. If you're obsessive compulsive like me, on OS X 10.6.x you can go to System Preferences->Security->Firewall (rightmost tab) and turn it off then on. You'll may be prompted for Administrator password. – Global nomad Mar 17 '11 at 16:21
    
Alas, this post by Rodrigo simply does not work. After losing hours trying to make it work, I painstakingly built a working shared VPN connection and documented it.. – Foliovision Mar 18 at 0:28

To share a VPN connection on 10.7, using WaterRoof, follow these directions.

To share a VPN on 10.8 and above, do the same thing with IceFloor

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Linking to rodrigo.sharpcube.com is appalling. I lost hours of my life following it. It's a totally unnecessary wild goose chase into IPFW. Please avoid. The first answer from JRobert is accurate. Here is a more detailed step by step with images.

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