[K12OSN] Network Question
Les Mikesell
les at futuresource.com
Sun Feb 13 01:17:19 UTC 2005
On Sat, 2005-02-12 at 17:23, Jim Christiansen wrote:
> All of the switches go into new 10/100 dell or dlink switches. I don't know
> more than that, but I'll check. Our cables are rarely checked after
> install... I know, but our techie is the only one for 9 schools and ...
>
> We did install a new fiber backbone at your and a couple of others
> encouragement last summer. Things were just awesome here for almost 3
> months, until more old recycled cat5 got added to the extremities of the
> network. Until then, the K12LTSP server system ran without a single issue-
> smb printing, nis, nfs, clients- all perfect. Now sometimes we can't print,
> kids can't access the NIS server (also the K12LTSP server) or clients just
> drop off.
>
> How do I check to see if autonegotiation is is on?
If the switches are managed you should be able to telnet to them or
use a web interface to check/change settings. You may be able to
see which ports have errors and whether you have any full/half
duplex mismatches. On the Linux side, use mii-tool or ethtool.
Switches are supposed to isolate errors but they don't always,
especially ones caused by out-of spec wiring. If you have to do
a brute-force check, unplug the new wires at the switch end until
the rest of the network stops seeing errors.
--
Les Mikesell
les at futuresource.com
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