Can only the 100Mbs part of a 10/100Mbs router fail?

Drew Van Zandt drew.vanzandt at gmail.com
Wed Dec 8 11:43:00 EST 2004


The rapid flashing of the port the 100Mbit link is connected to is
quite possibly the port (in 10 Mbit mode) interpreting 100 Mbit link
pulses as data, which is not an uncommon occurrence.  Use the excuse
to get yourself a WRT54G.  ;-)  (Yes, it runs Linux.)

--Drew


On Wed, 08 Dec 2004 11:36:46 -0500, Larry Cook <lcook at sybase.com> wrote:
> Dan,
> 
> Thanks for your repsonse.
> 
> > In one case it was a bad patch cable. The cable worked at 10Mbps but not
> > 100Mbps. I didn't try to determine why. Just replaced it.
> 
> I've tried three different cables directly connecting computer #2 and the
> router.  No difference.
> 
> > In some cheap 10/100 switches, the entire switch has to back down to 10,
> > if any 10 device is attached.
> 
> That does not appear to be the case with my Actiontec DSL-Modem/Router.
> Computer #1 has always been 10Mbs and computer #2 has always auto-sensed to
> 100Mbs (according to it's indicator lights).
> 
> > I've seen 100 equipment fail to
> > communicate because the link negotiation fails.
> 
> In those cases, did the status light indicate it has auto-sensed to 100Mbs?
> 
> > I've had network connections negotiate one speed and fail to communicate
> > on it. I've replaced either the network card or the switch to solve.
> 
> Okay.  That sounds like my problem.
> 
> > As someone mentioned, the connection between the 10 and 100 networks in
> > the switch may have failed.
> 
> Okay.  That could be the reason I get no communication.
> 
> > None of the ones I've seen were worth the effort of identifying the
> > cause since all were with real cheap equipment. Swapping out was more
> > economical than finding the underlying problem.
> 
> Yes, I agree.  Even if I find the underlying problem in the router, it's
> probably not "fixable".  I really just need to confirm the router is the
> problem.  Based on the responses so far, it appears that it could be having a
> 100Mbs only problem.
> 
> > But, yes, I've seen the 100Mbps part of a switch fail, but 10Mbps still
> > work. I've used the failing switch elsewhere in our in-house network
> > just for 10Mbps equipment. It would not successfully connect to 100Mbps
> > devices. Eventually it just died completely.
> 
> Maybe mine is on it's way out too.  A ping of the router was showing 30-60%
> packet loss from a 100Mbs computer.  Now I have 100% packet loss from a 100Mbs
> computer.
> 
> Thanks,
> Larry
> 
> 
> 
> 
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