In message <43576088.1050909@riscworks.net>, Timo Schoeler writes:
>Steven M. Bellovin wrote:

>>>
>> 
>> 
>> That sure sounds like a collision problem.  It could be the switch or 
>> its configuration, it could be a full/half-duplex mismatch (try setting 
>> that explicitl), or it could be something about the NIC or driver.
>
>hi,
>
>i tried this now on a manageable switch (Nortel 450):
>
>* running in full duplex mode not a single error occurs (i used a 4GByte 
>file and transferred it via ftp);
>
>* running in half duplex mode (set on the switch) shows the problem as 
>already written.
>

The next step is to try it on your original switch, but setting the 
interface mode explicitly to full- or half-duplex.  I suspect a 
negotiation problem, though I won't speculate if it's in the driver or 
your switch.

		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb