On 10/02/2014 01:34:26 PM, Rick Stevens wrote:
> On 10/02/2014 01:24 PM, Geoffrey Leach issued this missive:
> > This is a new Fedora 19 install.
> >
> > The install correctly detected the ethernet port.
> >
> > ifconfig sees em1, and the configuration data is correct
> >
> > There is a device plugged into the port, which monitors its ethernet
> port. (The device is known to work otherwise)
> >
> > So, somehow I'm supposed to specify the topology of the connection.
> >
> > Any suggestions on how to go about debugging the connection?
> Thanks.
>
> Debugging how? I'd say the first thing is to use "ethtool em1" on the
> Linux box to see if it sees a link and what configuration it's using.
> On my machine, I still use "eth0", so:
>
> [root@prophead ~]# ethtool eth0
> Settings for eth0:
> Supported ports: [ TP ]
> Supported link modes: 10baseT/Half 10baseT/Full
> 100baseT/Half 100baseT/Full
> 1000baseT/Half 1000baseT/Full
> Supported pause frame use: No
> Supports auto-negotiation: Yes
> Advertised link modes: 10baseT/Half 10baseT/Full
> 100baseT/Half 100baseT/Full
> 1000baseT/Half 1000baseT/Full
> Advertised pause frame use: Symmetric
> Advertised auto-negotiation: Yes
> Link partner advertised link modes: 10baseT/Half 10baseT/Full
> 100baseT/Half
> 100baseT/Full
> 1000baseT/Full
> Link partner advertised pause frame use: Symmetric
> Link partner advertised auto-negotiation: Yes
> Speed: 1000Mb/s
> Duplex: Full
> Port: Twisted Pair
> PHYAD: 1
> Transceiver: internal
> Auto-negotiation: on
> MDI-X: on
> Supports Wake-on: g
> Wake-on: g
> Current message level: 0x000000ff (255)
> drv probe link timer ifdown ifup rx_err
> tx_err
> Link detected: yes
>
> So you can see my NIC supports 10/100/1000baseT in both half and full
> duplex. The switch it's plugged into (the "Link partner") supports the
> same stuff and they both support auto negotiation. Between them
> they've
> negotiated a 1000baseT connection (1Gbps) in full duplex and eth0 has
> also determined that it is using twisted pair MDI-X (flipped) cabling
> (swapping the TX and RX pairs in the cable) and the very bottom shows
> eth0 has a link to the switch.
>
OK. The output is mostly identical, with these exceptions:
Advertised pause frame use: No
Link partner ... missing
PHYAD: 2
MDI-X: on (auto)
Supports Wake-on: pumbgCurrent message level: 0x00000007 (7)
drv probe link
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