Well there is the evidence that there's something unusual on that system unrelated to netspeed.
You can clearly see that according to the network IOCTL flags, etho isn't running (IFF_RUNNING).
So, what's the PCI [vendor:product] of the network device, which driver is managing it (lspci -vvnn -d ...), and what kernel version is it (uname -a). Also, are there any custom udev or networking settings?
Well there is the evidence that there's something unusual on that system unrelated to netspeed.
You can clearly see that according to the network IOCTL flags, etho isn't running (IFF_RUNNING).
So, what's the PCI [vendor:product] of the network device, which driver is managing it (lspci -vvnn -d ...), and what kernel version is it (uname -a). Also, are there any custom udev or networking settings?