check sum error

[Paul Claessen]

The symptoms you describe are, 9 times out of 10,
caused by a mismatch of duplex modes on your
network. (That is: the poor performance! Not sure
about the ROM checksum error!)
I have written drivers for 3COM (and many others) nics
for my company's proprietary operating system and 
have come across quite a few unreliable combinations 
of 3C90x flavors and switches when it comes to auto-negotiation.
I'm now advising all our customers to pre-configure
their nics (and switch ports) to the required speed and duplex mode.
That seemed to have helped the matter.

Kind Regards,
Paul 


*********** REPLY SEPARATOR  ***********

On 2/23/00 at 10:47 PM Prof. Andreas Gerber wrote:

>While using a 3COM 905B: Manufacture date (MM/DD/YY) 7/21/99, division
>6, product YW
>I found the following message in /var/log/messages:
>eth0: 3Com 3c905C Tornado at 0xb800,  ***INVALID CHECKSUM 002f*** 
>00:50:da:09:30:79, IRQ 10 
>8K byte-wide RAM 5:3 Rx:Tx split, autoselect/Autonegotiate interface.
>   MII transceiver found at address 24, status 7809.
>   Enabling bus-master transmits and whole-frame receives.
>
>
>In principle the interface works but I observe very slow downloads from
>the computer using samba and ftp.
>It takes some minutes to get a file from the linux server to a win-nt
>maschine. Transmitting a file from a NT computer to the linux pc yields
>good performance (about 6000kb/s).
>
>The linux box is operating under suse linux 6.2, kernel 2.2.10
>
>Any hints/advices?
>
>Thanks in advance
>
>Andreas
>-- 
>Prof. Andreas Gerber
>Fachhochschule Biberach, Karlstr. 11, 88400 Biberach
>+49 7351 582 257 Tel +49 7351 582 299 Fax
>mailto:gerber@fh-biberach.de http://www.fh-biberach.de
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