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RHEL で mii-tool と ethtool が示すリンクステータスが異なるのはなぜですか?

Solution Verified - Updated -

Issue

  • mii-tool および ethtoolが示すリンクのステータスが異なります。

  • ethtool は、eth0 で速度 1000Mb/s を報告しますが、mii-tool は 100 Mb/s しか報告しません。

以下は mii-tool コマンドの出力です。

eth0:100 Mbit, full duplex, link ok

ethtool eth0 :

Settings for eth0:
      Supported ports:[MII]
      Supported link modes:   10baseT/Half 10baseT/Full      
                     100baseT/Half 100baseT/Full
                     1000baseT/Half 1000baseT/Full
      Supports auto-negotiation:Yes
      Advertised link modes:10baseT/Half 10baseT/Full
                     100baseT/Half 100baseT/Full
                     1000baseT/Half 1000baseT/Full
      Advertised auto-negotiation:Yes
      Speed:1000Mb/s  <-----------
      Duplex:Half
      Port:Twisted Pair
      PHYAD:1
      Transceiver: internal
      Auto-negotiation: on
      Supports Wake-on: g
      Wake-on: d
      Current message level:0x000000ff (255)
      Link detected: yes

Environment

  • Red Hat Enterprise Linux 4 および 5

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