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
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！
2)
[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
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以上就是linux怎么检查网卡是否正常的详细内容。