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Posted by Albert Manfredi on July 8, 2006, 2:37 pm
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gfexrd@yahoo.com wrote:
> Hi,
>
> I am having problems with connectivity. I have a LAN that is splitted
> in 2 segment, segment 1 has 12 PCs and segment 2 has 14 PCs. Both
> segment are
> joined through a switch, 16 port each.
>
>
>
> |PC1| |PC2| .... |PC12|
> ------------------------
> |
> |
> ------------
> |switch 1 |
> ------------
> |
> |
> |
> ------------
> |switch 2 |
> ------------
> |
> |
> ------------------------ --------
> |PC1| |PC2| .... |PC14| |SERVER|
>
>
>
> The problem is until yesterday all were working OK, but today the PCs
> on segment 1 (switch 1) can not connect to server, neither between
> them.
> If I turn off switch 1, and turn it on, I have connection
> but only for a few seconds and then there is nothing again.
> If I put a old hub replacing the switch 1, everything works fine.
> I have tested 2 switches with same results, and I have checked the
> wired and
> seems everything allright.
>
> What is going on? Maybe electrical interferences ?
Did someone change the cable between the two switches? It sounds to me
like a cross-over cable was installed between the two switches at some
point. If you install a hub instead of a switch on LAN 1, everything
transmitted by the switch will be broadcast to all hosts in LAN 1.
Which is the correct way for a hub to be connected. But switches expect
straight-through cables when they are interconnected.
Bert
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