Wow, Ping works.... no Paketloss... but i can't get a connection via telnet... on Port 1000.
While configured on Port1000 connecting to Port80 is possible... getting cryptic chars on screen.
I have also reduced speed to check if it is a speed problem...
the same...
No connection to 1000 via telnet, Port 80 throws some cryptic chars...
If i call IP with a browser... there is a white screen.... on Port 80, on 1000 nothing happens.
1st Step is made... idea to get further steps done?
Thank you for that hint with Slip-Connection-Manager...
Greetings ChrisS
ADDITION:
Ok, i disconnected Arduino from PC...
Ping is possible too... delivered by ConnectionManager...
i will give up in this... buying an Ethernetshield 
Thank you.... and bye bye...
ChrisS