It has nothing to do with that.
What I was trying to do was to FTP on a straight 100mbit line. I have a switch on the LAN. And as far as I can se there is no collision problems. As I was saying.... the 10mbit eth0 interface is connected to a dsl modem. Wich gives me about 0.5mbit. Now the problem is that my straight 100mbit connection (with just one client connected) lands on about 0.5mbit. Wich is WAY to low for a 100mbit line.
therefore the communication speeds are as follows (on the LAN)
SERVER ---> CLIENT gives me 100Mbit speed. No problem there.
CLIENT ---> SERVER gives me the same speed as on my public external connection.

I hope this clarifies it.....