[K12OSN] Re: New amer.com switch troubles

David Trask dtrask at vcsvikings.org
Wed Jan 4 01:47:17 UTC 2006

Could be a bad switch....I've seen this once before....swapped for a new
one and it was fine.

"Support list for opensource software in schools." <k12osn at redhat.com> on
Tuesday, January 03, 2006 at 5:03 PM +0000 wrote:
>I emailed recently about this problem and I want to bring it up again. I 
>have a 1gig switch from amer.com and a 1gig intel nic in my server, but 
>for some reason the connection between the server and the switch will 
>not go over 100meg speed...
>I have tried a couple commands to tell it to re-negotiate, and to tell 
>it to go at 1000meg/full duplex, but it always ends up back at 
>100meg/full duplex. This is one of the commands I tried:
>ethtool -s eth0 duplex full speed 1000
>I have had several people suggest the cabling, I will give that another 
>try, but it's a long drive to go in and I would like to have some other 
>options when I do. What commands should I be running to verify the 
>connection, and to change it? Is there any config anywhere that might 
>tell it to use 100meg only? Or is it guaranteed to be a problem outside 
>of the server?
>I've heard certain kernels have trouble with 1gig speed. I don't know 
>what version I have, but I downloaded k12ltsp in early August. Someone 
>specifically mentioned that kernel version "2.6.11" and earlier has 
>troubles with GB ethernet? Has anyone else ever had similar troubles or 
>did it just magically work?
>Also, I am pretty sure the cable is cat5e, and cable from the same spool 
>is used between the swithes, and that connection reports 1000meg speed 
>on the switch, so the cable should be fine, correct? Unless that one 
>cable was badly crimped or by sheer bad luck has a flaw. Someone 
>suggested I need cat6 cable, is this true?
>Thanks for your input!
>K12OSN mailing list
>K12OSN at redhat.com
>For more info see <http://www.k12os.org>

David N. Trask
Technology Teacher/Director
Vassalboro Community School
dtrask at vcsvikings.org

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