Thanks, Problem solved, was... 
Problem with 3c575 (Guenther Wieser)
Maybe an autonegotiation problem? (David Hinds)
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... a problem with our switch, which sends signals that are mybe to low.
All machines that have a 3Com card here in our office had this problem.
The funny thing is that we never recieved something like an error or a retransmission.
Thanks for the hint with the tools!
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