查看网卡是否连接网线

 

ubuntu下先要给网卡写好配置：

auto em3
iface em3 inet manual
up ip link set dev $IFACE up
down ip link set dev $IFACE down

 

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 em3
em3: negotiated 1000baseT-FD flow-control, 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 em3

Settings for em3:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
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
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: off
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
drv probe link timer ifdown ifup rx_err tx_err
Link detected: yes

 

注：

“Link detected: yes”  这个表示已连接网线。

如果没有配置好网卡，会导致返回"Link detected: no"

 

参考：http://blog.chinaunix.net/uid-15866552-id-3483122.html