Is there any FOG forum in German language?
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 Only one device should be serving DHCP. Either FOG or your router, but not both. Pick one and disable DHCP on the other. 
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 There was a question about DHCP during fog-installation but I didn`t set any IP. I think this is the problem. Where can I change this. Should I start the fog installation again? And I think after fixing the problem I have to install the fog service at the windows client again. 
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 I deleted the fog config file, reinstalled fog and set the fog-server as dhcp-server this time. And now everything is fine. Thanks.