[lug] need cat5 wiring/"Dest host unreachable" help

[Nate Duehr]

If you're getting Destination Host Unreachable messages, the physcial
plant is good, leave it alone now and start looking into networking
(layer-3) issues.  :-)

On Thu, Oct 18, 2001 at 05:20:44PM -0500, Michael J. Hammel wrote:
> I'm trying to wire my upstairs game room to my downstairs office with CAT5
> cable.  The cable was already run when the house was built.  But the
> connections were mucked up.  So I'm trying to fix them.
> 
> My office has a gateway connected to a hub with 3 other computers
> (including a laptop) hooked directly into the hub.  All that works fine.  I
> connected the CAT5 cable in the wall to an CAT5 jack and moved the cable
> that was running to the laptop from the hub into the wall.  Upstairs I used
> the same wiring combination on the jack (see below) and plugged another
> cable from that jack into my laptop.  
> 
> I get a link light on the laptops connector (external pcmcia type) and on
> the hub.  However, when I ping anyone on the downstairs net from the laptop
> upstairs (or reverse the direction) I get "Destination Host Unreachable".
> I think the wiring is correct.  But I can't ping anyone on opposite floors.
> 
> I doubt the cable is over 100 meters in total length, so that shouldn't be
> the problem.  None of the cabled used to plug the laptop into the wall or
> the wall into the hub is a crossover cable, so that's the not the problem.  
> 
> Is the timeout for the ping expiring and making it look like the remote
> hosts can't be reached?  Should any of the transmit/receive wires be
> crossed?
> 
> I used the T568B standards for the wiring and run in straight through.  The
> wire from downstairs runs to a junction box where it is connected straight
> through to to the wire that runs to the wall in the game room.  
> 
> Anyone got any suggestions?  Some of the twists came out of the wires so I
> added them back in (I've heard that helps reduce noise).  But that didn't
> help.  The green/green-white pairs seem to provide link lights.  The
> orange/orange-white pairs seem to provide data.  Is that correct?  The
> blue/blue-white and brown/brown-white pairs are unused as far as I know.
> Those latter sets are currently unconnected.
> 
> -- 
> Michael J. Hammel                               The Graphics Muse 
> mjhammel at graphics-muse.org                      http://www.graphics-muse.com
> ------------------------------------------------------------------------------
> I have no special talents.  I am only passionately curious. -- Albert Einstein
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-- 
Nate Duehr <nate at natetech.com>

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