Steven M. Bellovin wrote:
> In message <4356070F.4040009@riscworks.net>, Timo Schoeler writes:
> 
>>>>>Do you use hardware checksum offload?
>>>>
>>>>no. it's disabled.
>>>
>>>
>>>So that's not the reason. I asked because I had it enabled.
>>>
>>>
>>>
>>>>(btw: IIRC i had the same issue on a G3 b&w in the office (this runs a 
>>>>bm0 NIC then) where i put in some spare NICs (fxp) to circumvent the 
>>>>problem. i'll do some reseach when i'm in the office.)
>>>
>>>
>>>Is it that bad? My G4 spilled out that message every few minutes and
>>>the network connection worked fine.
>>
>>uhm, i thought it to be noteworthy.
>>
>>the problem scales with the speed the packets come in/go out:
>>
>>* downloads from an ftp server outside the LAN (connected with 4Mbps) 
>>give no errors;
>>
>>* transfers with a host in the same LAN at 10Mbps give rarely errors of 
>>this kind, but they are there;
>>
>>* transfers with a host in the same LAN at 100Mbps gives a busy syslogd...
>>
>>the problem starts immediately, as i already noted, as soon as the ssh 
>>handshaking takes place.
>>
> 
> 
> 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.

timo