On Mon, Jun 08, 2009 at 02:03:00PM +0100, Faustino Frechilla wrote:
> Hi again,
>
> I made some testing today in my desktop machine, I won't try it again
> in the server until I make some progress in my machine since it is
> shared and someone can kill me if I break the network connection again
> :).
>
<snip>
...
> the file at original speed. I also looked for strange kernel messages
> in the log but I found nothing. And more strangely, I am positive the
> switch is not causing the problem. I played the file from one machine
> to another without any switch, just a cable connecting them, and the
> network interface of the machine playing the file is gone in the same
> way. I ran out of ideas or things to check, any advise?
>
<snip>
In the case with the two machines and a cross over cable (no switch)
first ping the other machine from both machines then do
arp -an
from a shell prompt on each machine to establish the normal arp entries. Then
try the tcpreplay command and when one machine can't ping the other do an
arp -an
again on both machines. I expect you will find that something about the
replayed file has corrupted the arp cache so one or potentially both machines
don't know where the other is any more. Duplicate MAC addresses on two hosts
on the same network (think Sun with multiple interfaces and by default all
the same MAC :-)) will do this. There was also an arp bug in Linux at one
point that was leaking MACs on all interfaces and causing similar issues.
Peter Van Epp
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