Degraded network (protocol problems?)

Hi!

We have in our network a Ubuntu server working correctly as a web
server & Linux Terminal Server but, unexpectedly, this machine
disconnects from the network. In this moments, this machine doesn't
response ping but it response with arping (I use Hardping tool [1]
from a Windows machine).

I think it's not a machine problem: It's a network problem. If we
disconnect some seconds some wires in our switch, this machine
responses again.

I heard something about protocol problems when there are to many
network traffic what... I don't know what we can do :-(

Any comment or suggestions ?

Thank you very much,

[1] http://www.hardping.com/


--
Gerard Farràs i Ballabriga
Coordinador TIC - Escola Arrels
http://www.escolaarrels.com
.

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