[K12OSN] Re: New amer.com switch troubles

M.Pribik mpribik at zoznam.sk
Wed Jan 4 16:19:50 UTC 2006

----- Original Message ----- 
From: "gKw-X" <gkw-x at shaw.ca>
To: "Support list for opensource software in schools." <k12osn at redhat.com>
Sent: Tuesday, January 03, 2006 11:03 PM
Subject: [K12OSN] Re: New amer.com switch troubles

> Hello,
> 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?

It can be true. If the the quality of the signal is is not very good, then
the speed go
low due to the autonegotiated function between cards and switch.
PS: Try the short test cable /cca 2m/ !!!

> Thanks for your input!
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