Gigaset SE105 Owner's Manual page 29

Configuring the local network
You will be prompted to select a connection method.
Select Other method and confirm with next.
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You will now see a screen listing various connection methods.
Select This computer connects directly to the Internet. The other computers on
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my network connect to the Internet through this computer. and click on next.
In the next window select your network adapter and click on next.
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Skip the message "This network configuration is not advisable" with next.
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