Strange networking problems

Strange networking problems

Post by Lorenzo Thurma » Fri, 30 Nov 2001 07:28:38

   I'm running Mandrake 8.0 on 7200 with two NIC's ( I use this machine
as a router). Over the past three days, I've run into a problem where
eth0, my external interface to the 'net, loses its IP address. The
interface is still up, just no IP address. Doing a network restart fixes
the problem for maybe 15 minutes. My internal interface continues to
work just fine. There is nothing in the log to inidicate a problem, and
when I place the internet connection on my  Mac (9.2), it hums along
just fine. Does anyone have any clues as to what the problem might be?
My external connection is a DSL provided by DirectTV (was Telocity).

1. Strange network problem (network suddenly stops working) - partial solution

Hi guys,

I don't know where to post it, so I am posting here.

I found that 2.4.x kernel has buggy driver for Intel EtherExpress Pro 10
NIC card (maybe some others modules as well - I don't know). These bugs
were introduced by converting a drver's code for 2.2.x kernels into 2.4.x
compliant code.

The eepro module has two bugs.

The first leads to detection a single card as 8 ethernet devices (with the
same IO address), which effectively blocks an usage of any other NIC in
the machine. The bug doesn't affect the system if the modules is loaded
with autodetect option (autodetect=1).

The second bug leads to sudden drop in NIC performance after transfering
some data (about 100KB for me). After transfering the data, the NIC
performance drops to the level of 100 B/s (0.1KB/s), which makes it

These errors don't exist in 2.2.x drivers. By comparing source code of
2.4.x and 2.2.x drivers I discovered and finally corrected errors in the
eepro module for 2.4.x kernels. I posted the message to guys who wrote the
kernel code and who made the latest changes. Both email addresses haven't
existed. If there is a maintainer of eepro module somewhere here, please
email me (remove "nospam" from my email address).

If someone is experiencing the mentioned problems with EtherExpress Pro
cards he can contact me. I have a corrected code for the new driver. This
is only one file (eepro.c) which should replace the original driver code
before recompiling kernel.

Best regards,

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