Home Operation and Maintenance Linux Operation and Maintenance How to check whether the network card is normal in Linux

How to check whether the network card is normal in Linux

Mar 22, 2023 am 10:08 AM
linux network card

How to check whether the network card is normal in Linux: 1. Check the network card status through the "mii-tool" command; 2. Check the network status through "network status"; 3. Check the linux status through the "ifconfig -a" command Information about all network interfaces; 4. Query the network card information through the "ethtool" command.

How to check whether the network card is normal in Linux

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

How to check whether the network card is normal in Linux?

Check the network card status or connection under Linux

1) Use the mii-tool command

       [root@localhost root]# mii-tool
        eth0: negotiated 100baseTx-FD, link ok
        eth1: no link
Copy after login

or

      [root@localhost root]# mii-tool -v
        eth0: negotiated 100baseTx-FD, link ok
          product info: vendor 00:50:43, model 2 rev 3
          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 flow-control
          link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
        eth1: no link
          product info: vendor 00:50:43, model 2 rev 3
          basic mode:   autonegotiation enabled
          basic status: no link
          capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
          advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
Copy after login

or

      [root@localhost root]# mii-tool -w
       21:20:33 eth0: negotiated 100baseTx-FD, link ok
       21:20:33 eth1: no link
      //mii-tool主要是用于配置网卡工作模式的指令,同时也可以进行查询、监控等工作!
Copy after login

2)

     [root@localhost /]# /etc/init.d/network status
      Configured devices:
      lo eth0 eth1
      Currently active devices:
      lo eth0
Copy after login

Equivalent to

     [root@localhost root]# service --status-all
      ............
      ............
      Configured devices:
      lo eth0 eth1
      Currently active devices:
      lo eth0
      ............
      ............
Copy after login

3)ifconfig -a

    [root@localhost /]# ifconfig -a
    eth0 Link encap:Ethernet HWaddr 00:09:6B:09:08:FC
          inet addr:192.168.10.1 Bcast:192.168.10.255 Mask:255.255.255.0
          inet6 addr: fe80::209:6bff:fe09:8fc/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:106732953 errors:0 dropped:0 overruns:0 frame:0
          TX packets:104379788 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:2351331877 (2.1 GiB) TX bytes:391707945 (373.5 MiB)
          Base address:0x2500 Memory:fbfe0000-fc000000
   eth1   Link encap:Ethernet HWaddr 00:09:6B:09:08:FD
          BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
          Base address:0x2540 Memory:fbfc0000-fbfe0000
Copy after login

4)ethtool

#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: 100Mb/s
        Duplex: Full
        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

#ethtool eth1

Settings for eth1:
        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: Unknown! (0)
        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: no
Copy after login

From above It can be seen that eth0 is in the connected state, and eth1 is not connected

Related recommendations: "Linux Video Tutorial"

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