RE: [K12OSN] Our sad school network... Ethereal help

["Bob Robnett" <rrobnett skusd k12 ca us>]

In following your posts I have a couple of questions/clarifications.  First,
you mentioned that everything worked fine when a couple of long reach
connections were disconnected.  Do have an idea of how many feet of cable
are involved with each?  Second, and this is on the long connection issue,
does your network use switched or hubs?  Which pairs are reversed on the
cables you tested?

Bob Robnett, Technology Coordinator
Southern Kern Unified School District
rrobnett skusd k12 ca us


-----Original Message-----
From: k12osn-admin redhat com [mailto:k12osn-admin redhat com]On Behalf
Of Les Mikesell
Sent: Friday, December 19, 2003 11:02 AM
To: k12osn redhat com
Subject: Re: [K12OSN] Our sad school network... Ethereal help


On Fri, 2003-12-19 at 11:15, Jim Christiansen wrote:

> Senior techs found out about this then asked for the Fluke to be RETURNED.
> The job is 9/10ths complete and the tester is gone...
>

That would be funny if it weren't so sad... It might be time
to pull a few connections loose from the back of the wall jacks
so it is obvious where the problem is.


> So sorry for the rant but I thought some history was needed.  I think the
> only way to get this solved is for ME to provide the evidence of a poorly
> wired network.  I have never used Etherreal before and if someone on this
> list could provide me with some simple no-brainer etherreal command to
dump
> the results of a network sweep indicating packets going to oblivion and
back
> again then I could email the results to our superintendent, every
technician
> and my principal.

Error packets are discarded before ethereal would see them.
However, they are counted in the interface statistics
shown by ifconfig.   If you are connected with in-spec
wires through full-duplex switches you should never see
errors in the ifconfig report.  This will apply to each
connection individually from the switches so you'd have
to check from each client after running a while and it
may be hard to run on a thin client.  If your switches
are managed you can get the same error info from them.
You can graph utilization and errors via snmp with
cacti (http://www.raxnet.net/).  The current version makes
it easy to show all the ports of a switch - earlier versions
made you add the graphs individually.

---
  Les Mikesell
    les futuresource com


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