输入mii-tool可以查看网线是否连接到网卡
#mii-tool
- eth0: negotiated 100baseTx-FD, link ok
有时驱动可能不支持会出错下列错误
#mii-tool
- SIOCGMIIPHY on ‘eth0‘ failed: Operation not supported
- no MII interfaces found
可以使用ethtool查看
#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: pumbg
- Wake-on: g
- Current message level: 0x00000033 (51)
- Link detected: yes
Link detected: yes为正常no为失败
