Why do I get input/output error when using mii-tool on Red Hat Enterprise Linux 5.4?

Solution Verified - Updated -


  • Receive error on Red Hat Enterprise Linux 5.4 when running mii-tool on device using e1000e driver/module

    [root@system ~]# mii-tool
    eth0: negotiated 100baseTx-FD, link ok
    eth1: negotiated 100baseTx-FDflow-control, link ok
    SIOCGMIIREG on eth2 failed: Input/output error
    eth2: negotiated 100baseTx-FD, link ok
    SIOCGMIIREG on eth3 failed: Input/output error
    eth3: negotiated 100baseTx-FD flow-control, link ok


  • Red Hat Enterprise Linux 5
  • kernel versions above 2.6.18-92.el5
  • net-tools-1.60-78.el5

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