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

[Travis Roy]

It could be a duplex mismatch but I doubt it.

I have had this happen to myself personally, where the 100mb part didn't 
work and the 10mb part did.

I assume by router you mean broadband router, not a "real" router.

Most consumer level 10/100 "switches" or "routers" are switching hubs. 
That is there's a 100mb hub and a 10mb hub and the switching happens 
between the 10 and 100mb parts, not between each port. So that part 
might also be broken.

> I'm having a network problem that appears to be that the 10/100Mbs ports 
> on my router are no longer working at 100Mbs, but are working at 10Mbs. 
> Is it possible that just the 100Mbs part could fail?
> 
> Here's my scenario if anyone is interested.  Connected to the router are 
> the following:
> 
> Computer #1 w/ 10Mbs NIC
> Computer #2 w/ 10/100Mbs NIC (auto-senses to 100Mbs)
> 100Mbs switch
> 
> Computer #1 (10Mbs) works fine, but Computer #2 (100Mbs) and everything 
> behind the 100Mbs switch cannot get to the router.  Switching ports on 
> the router and power-cycling the router made no difference.
> 
> I put computer #2 (100Mbs) behind the 100Mbs switch and it can get to 
> all computers behind the switch, but not to the router.  So this tells 
> me that the NIC in computer #2 is okay.  It also seems to imply that the 
> 100Mbs switch is okay since computer #2 can talk to another 100Mbs 
> computer behind the switch.
> 
> If I replace the 100Mbs switch with a 10Mbs switch, then everything 
> behind it can now get to the router, including computer #2 which 
> auto-senses to 10mbs. But when I move computer #2 back to the router, it 
> auto-senses to 100Mbs and cannot get to the router.
> 
> So the only thing that seems to explain my problem is that the 100Mbs 
> part of my router has gone bad, although devices connecting to it are 
> auto-sensing to 100Mbs.  Or is there something that I am overlooking, or 
> something else I should try?
> 
> Thanks,
> Larry
> 
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