ethtool - Display or change ethernet card settings
ethtool 로 Speed 및 auto-negotiation 및 Link detected 를 확인 할수 있다.
[root@rhel 바탕화면]#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: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 2
Transceiver: internal
Auto-negotiation: on
MDI-X: off
Supports Wake-on: pumbag
Wake-on: g
Current message level: 0x00000001 (1)
Link detected: yes
드라이버및 펌웨어 버젼 확인
[root@rhel 바탕화면]#ethtool -i eth0
driver: e1000e
version: 1.2.20-k2
firmware-version: 0.12-1
bus-info: 0000:00:19.0
본딩시 유용한 명령어 (랜포트 램프 점등)
ethtool -p eth0 100
operation not supported 라고 나오면 -p 옵션 말고
ethtool eth0
Link detected : yes or no 로 확인 하고 본딩을 하면 된다.