From owner-freebsd-net@FreeBSD.ORG  Mon Sep 19 00:11:24 2005
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From: Kevin Day <toasty@dragondata.com>
Date: Sun, 18 Sep 2005 19:11:30 -0500
To: Benjamin Rosenblum <ben@benswebs.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: Problems with SK and EM network cards/drivers on my system
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On Sep 18, 2005, at 1:15 PM, Benjamin Rosenblum wrote:

>
> when i am running a very high network load (streaming video,  
> dumping ALOT of data across the network, etc) the network card  
> disconnects (i loose pings and all my transfers drop) and 15-20  
> seconds later it pops up on the console with "em0: Link is up 1000  
> Mbps Full Duplex" and then it starts working again.  again im at a  
> dead wall and really want my network to work properly so i can do  
> what i need to do.
>

I've seen the same problem on em devices under two situations. The  
first being a bad cable. The second being a switch that was trying to  
use flow control(unsuccessfully). Try locking both the switch and the  
card to 1000BaseTX with full duplex.