查看linux系统下网卡是否连接网线的状态

一、通过mii-tool指令
[root@linuxzgf ~]# mii-tool
//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！

二、ethtool

[root@linuxzgf ~]# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000007 (7)
        Link detected: yes
从上面 Link detected 可以看出eth0 处于连接状态

三.[root@linuxzgf ~]# /etc/init.d/network status

配置设备：
lo eth0 eth0.10 eth0.2 eth0.3 eth0.4 eth0.5 eth0.7 eth0.8 eth1
当前的活跃设备：
lo eth0 eth0.10

[四、ifconfig -a
    [root@linuxzgf ~]# ifconfig -a
   eth0      Link encap:Ethernet HWaddr 00:E0:81:80:D8:96
          inet6 addr: fe80::2e0:81ff:fe80:d896/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:626032 errors:0 dropped:0 overruns:0 frame:0
          TX packets:415035 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:123631002 (117.9 MiB) TX bytes:297575498 (283.7 MiB)
          Base address:0x2000 Memory:df300000-df320000

   eth1      Link encap:Ethernet HWaddr 00:E0:81:80:D8:97
          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:0x2020 Memory:df320000-df340000

五、lspci也可以看到网卡的信息