On Tue, 2020-02-11 at 04:12 +0800, Ed Greshko wrote:
> On 2020-02-11 00:10, Patrick O'Callaghan wrote:
> > On Mon, 2020-02-10 at 22:04 +0800, Ed Greshko wrote:
> > > The key is....
> > > 
> > >  Link partner advertised link modes:  10baseT/Half 10baseT/Full 
> > >                                      100baseT/Half 100baseT/Full 
> > > 
> > > The other side is telling that it only supports 100Mb/s
> > Interesting. I have another machine (my NAS) connecting at 1Gbps to
> > another port on the same router. Unfortunately it runs an ancient
> > version of Debian so doesn't have ethtool.
> 
> A question and a test.
> 
> If your NAS doesn't have ethtool how are you certain what speed it is 
> connected at?

The router shows the port running at 1000Mbps.

> Well, move the cable from the back of the NAS to the back of the machine with 
> the issue.
> This way the machine gets the cable and the port which you believe to be 
> working.

I switched the cable that came with the router for the Cat-6 I was
using when this problem arose originally, but without changing the
port.

It's now running at 1000Mbps. Clearly the (new) cable was at fault.

Thanks.

poc
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