查看网卡是否连接网线

说明： 重启网卡会造成短暂的网络断开，大概丢失6个ping包。30秒吧。

 

1. 查看网卡是否连接网线

[root@PLASPACSHCN13 ~]# mii-tool

2. 查看指定网卡是否连接网线

[root@PLASPACSHCN14 ~]# mii-tool eth0
eth0: negotiated 100baseTx-FD, link ok

3. 给网卡配置ip地址，然后ping这个ip地址即可。

4. [root@PLASPACSHCN14 ~]# ethtool eth1
Settings for eth1:
 Supported ports: [ TP ]
 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 pause frame use: Symmetric
 Advertised auto-negotiation: Yes
 Speed: Unknown!
 Duplex: Unknown! (255)
 Port: Twisted Pair
 PHYAD: 2
 Transceiver: internal
 Auto-negotiation: on
 MDI-X: Unknown
 Supports Wake-on: g
 Wake-on: g
 Current message level: 0x000000ff (255)
 Link detected: no

“Link detected: no”  这个表示没有连接网线。