Screen-Sharing and Internet-Sharing via same network connection

Hello out there,
I'm using a TiBook (G4 867MHz) and a MacBook Pro 17". They are connected via a WLAN-router. Additionally the MBP is connected to the internet via an UMTS-connection established with a Merlin 870XU type PC-card.
Network is working fine, including screen-sharing. Also the internet connection on MBP works without error. But if I activate Internet-Sharing via WLAN to get my TiBook connected to the internet, the MBP connection to the WLAN is cut off.
Can somebody tell me what's going wrong and how to solve it?
Greetings from good old Germany
Ansgar

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