查看网卡的物理连接状态，可以通过【ethtool】。

具体如下：

[root@ora11gdg1 ~]# service network status
Configured devices:
lo eth0
Currently active devices:
lo eth0
[root@ora11gdg1 ~]# 
[root@ora11gdg1 ~]# 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 pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes
[root@ora11gdg1 ~]#

可以看到：
Link detected: yes

物理连接正常。

————————————————
Done。