Find your network interface speed and duplex settings

“ethtool” and “mii-tool” commands can be used to find the network card speed and the network link details.

Find details about the network interface card :

[root@linux-cloud ~]# ethtool  eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s                     <– The network interface is capable of 1000Mbps
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes
[root@linux-cloud ~]#

Find the network link speed and duplex details :

[root@linux-cloud ~]# mii-tool  -v
eth0: negotiated 100baseTx-FD, link ok  <– Shows 100Mbps & Full duplex
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

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