network problems on optiplex 745

A little while ago I posted about my problem trying to get
bcm5754 
working on an OptiPlex 745:

http://mail-index.netbsd.org/current-users/2007/0
1/09/0003.html and 
http://mail-index.netbsd.org/current-users/2007/0
1/09/0005.html

I since had a brief dialog with Jonathan Stone who suggested
some 
changes to the broadcom support but they made no difference
so the 
current behaviour is still that packets get out but it
doesn't appear 
to notice packets coming back.

So I bought a cheap realtek pci card and plugged it in and
it appears 
to do the same thing - I can see arp packets coming out of
it but the 
machine never notices the response packets sent back. 
However if I 
move the realtek card to an Optiplex 620 it works fine.

Anyone got any idea whats going on?

cheers
mark

On Mon, 12 Feb 2007 11:34:21 +1300
Mark Davies <markmcs.vuw.ac.nz> wrote:

> A little while ago I posted about my problem trying to
get bcm5754 
> working on an OptiPlex 745:
> 
> http://mail-index.netbsd.org/current-users/2007/0
1/09/0003.html and 
> http://mail-index.netbsd.org/current-users/2007/0
1/09/0005.html
> 
> I since had a brief dialog with Jonathan Stone who
suggested some 
> changes to the broadcom support but they made no
difference so the 
> current behaviour is still that packets get out but it
doesn't appear 
> to notice packets coming back.
> 
> So I bought a cheap realtek pci card and plugged it in
and it appears 
> to do the same thing - I can see arp packets coming out
of it but the 
> machine never notices the response packets sent back. 
However if I 
> move the realtek card to an Optiplex 620 it works
fine.
> 
> Anyone got any idea whats going on?

At that point, I'd wonder about the cable.


		--Steve Bellovin, http://www.cs.columbi
a.edu/~smb

On 11 Feb 2007, at 22:50, Steven M. Bellovin wrote:
>> So I bought a cheap realtek pci card and plugged it
in and it appears
>> to do the same thing - I can see arp packets coming
out of it but the
>> machine never notices the response packets sent
back.

That could be an interrupt routing problem. Can you put e.g.
a USB  
controller
in that PCI slot?

>>   However if I
>> move the realtek card to an Optiplex 620 it works
fine.
>>
>> Anyone got any idea whats going on?
>
> At that point, I'd wonder about the cable.

Or the switch (port).

	Kind regards

-- 
Matthias Scheler                           http://zhadum.org.uk/

This is an amazingly unlikely possibility, but could you try
a
kernel generated from sources dating from 2006-12-07 or
earlier?
I'm chasing down some interrupt problems, and they seem to
date
from right around then.

On Monday 12 February 2007 11:50, Steven M. Bellovin wrote:

> > Anyone got any idea whats going on?
>
> At that point, I'd wonder about the cable.

I should say I've seen the broadcom problem on multiple
745's plugged 
in to multiple cables/networks (one of them is currently at
home the 
others at work).

A further data point: I've plugged an intel "wm"
into one of the 745's 
and it works.  However I have 80 of these machines that I
need to get 
going in the near future.

cheers
mark