linux怎么检查网卡是否正常

本教程操作环境：linux5.9.8系统、Dell G3电脑。

linux怎么检查网卡是否正常？

查看Linux下网卡状态或是否连接

(资料图片仅供参考)

1) 通过mii-tool指令

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

或

[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

或

[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！

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

等同于

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

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

4)ethtool

#ethtool eth0Settings 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 eth1Settings 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

从上面可以看出eth0 处于连接状态，eth1没有连接