Why does ethtool show 'no link' for ethernet interface even though cable is physically connected?

Solution Verified - Updated -

Issue

  • The ethtool command shows Link detected: no for interface
  • The ip link command shows UP but NO CARRIER
  • The mii-tool command shows SIOCGMIIPHY on 'ethX' failed
  • The network link light is on but the interface will not come up
  • The message ADDRCONF(NETDEV_UP): ethX: link is not ready appears in kernel messages

Environment

  • Red Hat Enterprise Linux
  • Ethernet network interface

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