Internet sharing with 802.1X auth. on

Hi all,

has anyone ever succeeded to setup the following?
- I'd like to login to a private network using 802.1X authentication, then share this connection to my other Macbook nearby me using Airport.
I have set up internet sharing from eth0 to airport, and it goes well, but only until I login to the 802.1X network. At this moment, the internet sharing suddenly stops, and it doesn't help it starting again (stops again).

Is it designed this way, or did I run into a malfunction?

Thanks for any answers,
Peter