今天小编给大家分享一下linux如何检查网卡是否正常的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
linux检查网卡是否正常的方法：1、通过“mii-tool”指令查看网卡状态；2、通过“network status”查看网络状态；3、通过“ifconfig -a”命令查看linux中所有网络接口的信息；4、通过“ethtool”命令查询网卡信息即可。
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 eth2: 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 eth2: 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 eth2: 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 eth2 Currently active devices: lo eth0
等同于
[root@localhost root]# service --status-all ............ ............ Configured devices: lo eth0 eth2 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 eth2 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 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 eth2 Settings for eth2: 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，eth2没有连接