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 From:  "Lee Sharp" <leesharp at hal dash pc dot org>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Intel NICS not working.
 Date:  Wed, 24 May 2006 09:51:26 -0500
From: "Ulrik Lunddahl (PROconsult)" <ul at proconsult dot dk>

> I use the PC images in standard rack mount PC's

> This time i used Intel Gigabit adapters (PWLA8391GT), but i noticed
> dropouts more specific it looked like the adapters resets itself, because 
> my
> switch lost link for a sec or two, and then the connection was good again.

> I changed NICS, cables and so on, but the problem was still there, all i 
> got
> in the console was link down and then link up again in 2-10 seconds.

> I changed to 100 Mbit intel nics (PILA8460C3), same behavior but a lot
> more in the logs.

This first thing I would look for is IRQ conflicts.  Also, you might try 
different PCI slots.